M&C-PCN-100-2013 Draft
M&C-PCN-100-2013 Draft
M&C-PCN-100-2013 Draft
M&C/PCN/100/2013
RDSO SPECIFICATION
No. M&C/ PCN/ 100/ 2013
PAINTING SYSTEM
i) General : Chapter-I
ii) Epoxy Zinc Phosphate primer : Chapter –II
iii) Unsaturated Polyester Putty : Chapter-III
iv) PU Surfacer : Chapter-IV
v) PU Full Gloss Enamel (Two Pack) : Chapter-V
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CHAPTER-I
1. GENERAL: This Chapter provides information with regard to Surface preparation, details of
various components of painting system, aspects to be adhered to by the manufacturers,
procurement details to be followed by the users and other important aspects.
2. Surface Preparation: The substrate shall be degreased by using suitable petroleum hydrocarbon
solvents to IS: 1745-78. After degreasing, the surface shall be prepared by grit blasting to white
metal and the prepared surface shall match to minimum A Sa of ISO Specn No. 8501-1.
3. Components of the Painting system: The painting system has the following components
4. Important Instructions
A. For manufacturers:
i) The paint Manufacturers shall indicate the presence of un-reacted monomer in the
system to ensure freedom from pollution hazards.
ii) For touch up painting, during POH, the paint supplier shall supply the material in
one liter packing. However, bulk supply of paint shall be in 20 liters packing.
.
iii) Manufacturers shall submit internal test certificate for each product for all the parameters
specified, at the time of supplying the material.
iv) Manufacturers shall submit material safety data sheet along with the supplies.
v) Indian Railways are using cleaning compositions for cleaning of exterior of coaches to
RDSO Specification No. M&C/ PCN / 101/ 2001, taking into this and other aspects
such as prevailing operating / service conditions, the Manufacturers will take warranty
of their material regarding gloss retention, colour retention and adherence property at
the time of supplying the painting system, to be used for painting of railway assets.
The minimum acceptable limits, for the above properties, after various duration, are as
follows
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S.No. Time Gloss Retention Colour Retention Adherence of Paints (with each
Period (Initial gloss>85 units at Rating on 0-10 other and with substrate)
60º) scale (Initial rating Cross-Cut Tape Adhesion test
of painted as per ASTM D:3359/97 (or
panels/coach or latest)
ISC/RAL Shade
Card shall be
taken as 10)
1. After 1 80% of initial gloss 7 5B
Year
2. After 2 70% of initial gloss 6 5B
Year
3. After 3 60% of initial gloss 5 4B
Year
vii) Manufacture shall certify that the paint material is free from health hazardous material like Cr, Pb,
Hg, Asbestos etc. and also that the material is free from carcinogenic and Estrogen minimic
solvents.
viii) Unsaturated polyester putty shall be supplied in small containers and after mixing the contents of
both the packs, the amount of putty should be 5 ± 0.5 Kg which can be easily consumed within its
pot life i.e. 30 minutes.
ix) Marking and Packing: Each container shall be marked with the following:-
a. Name of the material
b. Source of manufacture
c. Volume of the material
d. Batch No. or Lot No. in code or otherwise and
e. Month& year of manufacture
f. Shelf life of paint /material in container and temperature to be stored at.
x) For touch up/patch painting, the material shall be supplied in one liter container
B. Procurement Authorities :
All paints including thinner for the above painting systems must be procured from the same source
to ensure compatibility.
C. Testing Authorities :
i) The paint shall be tested after mixing pack A & B in the stipulated ratio as mentioned in
corresponding chapter of different components of paint system. No thinner shall be
employed until recommended by the manufacturer.
ii) The following tests in this specification are defined as Type tests-
iii) All other tests as laid down in the specification are defined as Acceptance Tests
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iv) At the time of initial approval all characteristics of paints after mixing pack A and B in the
stipulated ratio as mentioned in corresponding chapter of different components of paint
system shall be tested as per the specification.
v) When the total quantity of the paint purchased is up to 10 below-coach sets in single or
multiple lots, the acceptance or rejection by the inspecting agency shall be of each
multiple lot or the entire single lot based on test results of the acceptance tests.
vi) When the total quantity of paint to be purchased is more than 10 coach sets, testing of
each multiple lot (part quantity) shall be carried out for acceptance test and/or type tests
as given below-
D. Coach Builders :
i) Normally addition of thinner in prepared paint (obtained after mixing Pack A & Pack B in
recommended mixing ratio) shall not be required. If environmental fluctuations (e.g. fall in
temperature) take place, then small amount of thinner as recommended by the
manufacturer, subject to a maximum of 10% (v/v), may be added to adjust the spray
viscosity.
ii) For ensuring adherence to flash off time, after the painting operation, the coach shall be
placed at the entrance of the curing oven and the coach shall be moved inside the oven
slowly to cover the stipulated flash off time.
iii) Due to short pot life, the unsaturated polyester putty may be prepared by mixing the
contents of both the packs near the coach in small batches, as per the requirements,
which can be consumed with in its pot life i.e. 30 minutes
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CHAPTER-II
1. SCOPE
1.1 This standard specifies requirements and methods of testing of Epoxy based Zinc
Phosphate Priming paint supplied in two packs, intended to be used, for coaches,
bridges and special type of wagons. Two components epoxy zinc phosphate primer
is intended to be used as an anti corrosive primer over bare steel surface garnet/ grit
blasted to ASa2½ of ISO: 8501-I. The material shall have good adhesion on the
substrate and shall have good compatibility with subsequent coats of two pack
unsaturated polyester based putty, two pack polyurethane based under coat paint and
two pack polyurethane based top coat paint, as the painting system may require the
application of these materials. The primer should be suitable for spray application (as
per Chapter I, Para 3) It may also be suitable for application by brush for touching up
smaller areas.
1.2 The paint obtained by mixing the material in two packs is used as a highly protective
anti-corrosive primer on steel surfaces for providing a much higher degree of
protection than conventional single pack primers.
2. TERMINOLOGY
2.1 For the purpose of this standard apart from the glossary of terms given in IS:
1303- 83 and Cl2 of IS: 9162-79, the following shall also apply. Rounding off, of
observed values on different tests shall be in accordance with IS: 2-1960.
2.1.1 Pack : The term used to describe each of the two packs of the paint which when
mixed together, form an epoxy based zinc phosphate priming paint.
2.1.2 Paint : The mixture of the 2 packs, along with thinner, in the proportion
recommended by the manufacturer. The mixing of the two packs shall be done
with the heavy duty stirrer for 15 minutes max (the rise in temp. shall not be more
than 5oC).
3. REQUIREMENTS:
3.1 The mixing ratio of the pack A and pack B shall be simple ratio and same as
supplied in dual containers.
3.2 Composition: The paint shall consist essentially of two packs, namely pack A and
pack B
3.2.1 Pack A: (Normally referred to as base) shall consist of (a) Epoxy resin
(b) Pigment.
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3.2.1.1 In the formulation of the paint, epoxy resin of the following grade shall be used.
The paint shall contain 45 ± 5% by mass of pigment on the mass of paint and a
minimum of 16% by mass of zinc phosphate pigment, on the basis of,%by mass
of total pigment apart from other pigment, such as extenders, as may be
necessary conforming to IS : 10897-84, when both the components mixed in the
ratio as given by manufacturer tested as per of IS: 101-90,Part 8/ Section 2 by
using the following extraction mixture.
3.2.1.3 The pigment shall conform to IS:10897-84 (Specification for zinc phosphate
pigment.
4. Properties:
4.1 General: The paint shall comply with the requirements specified in Table II of
this specification.
4.2 Unless otherwise specified, the following testing conditions shall apply.
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4.2.1 The preparation of metal panels shall be in accordance with CL.5.2.1.1 of IS: 101-
86.
4.2.2 All the tests shall be conducted at room temperature (27 ± 2 oC) and a relative
humidity at 65 ± 5% in a well-ventilated chamber free from draughts and dust.
4.2.3 Condition in Containers: Each component as delivered, shall be free of gel, coarse
particles, skins, foreign matter and sediments. Any sediment that does form must
be easy to stir up with a high speed stirrer for 15 minutes maximum, in order to
give a homogenous paint.
4.2.4 The two packs i.e. base and hardener shall be mixed in the ratio as recommended
by the manufacturer, before conducting the test or tests. Where the paint is
required to be applied on panels, it shall be done so by suitable spray (as per
Chapter I, Para 3) . After mixing the two components thoroughly, an induction time
of 10 to 15 minutes shall be allowed before use.
Sl. Test Type of Metal Size in Painting DFT Method Duration of Air Special
No Panel m.m. Detail of Drying Before Instructions
. applicat Commenceme
ion nt of test
(Applicable for
panels either
air dried or
dried at
elevated
temperature)
1. Drying time M.S. 150 X 100 One coat of 60micron as per - -
X1.25 epoxy Zinc s Chapter
Phosphate I, Para
Primer 3
2. Finish -do- -do- -do- -do- -do- 48 hours -
3. Colour -do- -do- -do- -do- -do- 24 hours -
4. Dry film
thickness -do- -do- -do- - -do- -do- -
-
5. Flexibility & Tinned 150 X 50 -do- -do- -do- 7 days -
Adhesion X 0.315
6. Scratch -do- -do- -do- -do- -do- -do- Apply a load
Hardness 1.5 Kgs
instead of 1
Kg as speci
-fied in
Cl. 15.1.2 of
IS: 101-88
7. Resistance to M.S. 150 X 100 -do- -do- -do- -do- For 500
Salt Spray X 1.25 hours
8. Protection -do- -do- -do- -do- -do- -do- -do-
against
corrosion under
conditions of
condensation
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CHAPTER –III
1. SCOPE
1.1 USES
Material complying with this standard is intended to be used for levelling up effectively
the surface imperfections viz., dents and depressions less than 2 mm of the exterior
of Railway Coaches, Diesel and Electric Locomotives and other industrial
applications. Dents more than 2 mm may be filled in, with the help of fillers based on
unsaturated polyester resin filled with glass bubbles or any other suitable material.
The material shall have good compatibility with Epoxy Zinc Phosphate primer on
which it is to be applied and with Polyurethane surfacer, which is to be used as a
subsequent coat.
1.2 DEFINITION
For the purpose of this standard, the glossary of terms given in IS : 1303-83, shall
apply. Rounding off, of observed values on different tests shall be in accordance with
IS: 2-1960
2.1 COMPOSITION
MIXING RATIO: The mixing ratio shall be according to the recommendation of the
supplier.
1.1 PROPERTIES
2.2.1 GENERAL
The paint shall comply with the requirements specified in TABLE-1 of the
specification.
The preparation of metal panels shall be in accordance with Clause 5.2 to 5.2.1.2
of IS: 101-1986.
All tests shall be conducted at room temperature (27 ± 2 0C) and a relative
humidity of 65 ± 5% in a well-ventilated chamber free from draughts and dust.
The two-component knifing Putty (Component „A‟ & „B‟) shall be mixed in the ratio
recommended by the manufacturer (before conducting the test).
For the preparation of painted panels for conducting different tests mentioned in
Table-1, the details given in Table-2 shall be followed.
Each component, as delivered, shall be free of gel, coarse particles, skins, foreign
matter and sediments. Any sediment, that does form, must be easy to stir up with
a high speed stirrer for 15 minutes maximum, in order to give a homogeneous
paste.
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Note: Pot life is taken as the duration up to which the mixed material is still in a usable
condition, starting from the time of mixing.
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CHAPTER-IV
1.2 DEFINITION
For the purpose of this standard, the glossary of terms given in IS: 1303-83, shall
apply.
1.3 COMPONENT
The term used to describe each of the two parts of the paint which, when mixed
together, form a pigmented polyurethane paint.
1.4 PAINT
1.5 COMPOSITION
The paint shall consist essentially of two components namely COMPONENT „A‟
and COMPONENT „B‟.
1.6 The two components Polyurethane surfacer (Component „A‟ & „B‟), shall be mixed
in the ratio recommended by the manufacturer of the paint before conducting the
test or tests. Where the priming paint is required to be applied on panels, it shall
be done so by using suitable spraying technique. After thorough mixing of the two
components, an induction time of 10 to 15 minutes shall be allowed before use.
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1.7 The spray gun shall be thoroughly cleaned before use. It shall be fitted with the
correct size of nozzle and air cap. In case of airless, the pressure ratio of air
cylinder to hydraulic cylinder shall be adjusted in accordance with the
viscosity of the material to be sprayed. The material shall be sprayed
carefully so as to obtain an even and uniform coat having a dry film
thickness of 60 microns minimum per coat. The mixed paint shall show
good spraying properties on vertical panels. The film when dry shall be free
from sags, runs, streaks and any other film defects.
Each component, as delivered, shall be free of gel, coarse particles, skins, foreign
matter and sediments. Any sediment that does from, must be easy to stir up with
a high speed stirrer for 15 minutes maximum in order to give a homogeneous
paint.
TABLE-1
TABLE 2
DETAILS OF PREPARING PAINTED PANELS FOR TESTING
POLYURETHANE SURFACER (TWO PACK)
CHAPTER – V
This standard specifies requirements and methods of testing a two-pack full gloss
Polyurethane Enamel, intended to be used for the protection and decoration of
exteriors of Railway Coaches, Diesel and Electric Locomotives and other
industrial applications, against atmospheric corrosion. It is primarily suitable for
application by spraying. It may also be applied by brush for touching up small
areas.
1.2 USES
Material complying with this standard is intended to be used as top coat in paint
system for the protection of exteriors of Railway coaches, Diesel and Electric
Locomotives and other industrial applications, against corrosion, involving wet and
damp areas, high humidity, coastal/marine and industrial fallout. Polyurethane
paints are suitable for use in those exterior applications where it is desirable to
retain colour and gloss for long periods of time in addition to providing excellent
chemical, abrasion and corrosion resistance.
1.3 DEFINITION
For the purpose of this standard, the glossary of terms given in IS: 1303-83, shall
apply.
1.4 COMPONENT
The term used to describe each of the two parts of the paint which, when mixed
together, form a pigmented polyurethane paint.
2.1 PAINT
The mixture of the two components in the proportion recommended by the
manufacturer.
2.1.1 COMPOSITION
The paint shall be consist essentially of two components, namely COMPONENT
„A‟ and COMPONENT „B‟
3.1 PROPERTIES
3.2 GENERAL
The paint shall comply with the requirements specified in TABLE 1 of the
specification.
3.2.1 Unless otherwise specified, the following testing conditions shall apply:
3.2.2 The preparation of metal panels shall be in accordance with Clause 5.2 to 5.2.1.2
of IS: 101-1986.
3.2.3 All tests shall be conducted at room temperature (27 ± 20C) and a relative
humidity of 65 ± 5% in a well-ventilated chamber free from draughts and dust.
3.2.4 The two components P.U. Finish Enamel (component „A‟ & „B‟), along with thinner,
shall be mixed in the 4:1 ratio before conducting the test or tests. However,
during mixing of the two components in large quantities for painting coach/locos,
the mixing may be done by using a high speed stirrer for 5 minutes max. (Rise in
temp. shall not be more than 5 0C). After through mixing of the two components,
an induction time of 10 to 15 minutes shall be allowed before use. Where the
enamel is required to be applied on panels, it shall be done so by using suitable
spraying apparatus (as per Chapter I, Para 3).
3.2.5 The spray gun shall be thoroughly cleaned before use. It shall be fitted with the
correct size of nozzle and air-cap. In case of airless spray, the pressure ratio of
air cylinder to hydraulic cylinder shall be adjusted in accordance with the
viscosity of the material to be sprayed. The pressure ratio shall be adjusted
in accordance with the viscosity of the material to be sprayed. The material
shall be sprayed carefully so as to obtain an even and uniform coat having a
dry film thickness of 35 microns minimum per coat. From the relationship (b)
in Appendix-I, determine the approximate wet film thickness required to obtain the
above specified dry film thickness.
3.2.6 The mixed paint shall show good spraying properties on vertical panels. The film,
when dry, shall be free from sags, runs, streaks, and any other film defects.
3.2.7 The above condition holds good wherever the use of Epoxy Primer and P.U.
surfacer has been recommended to be used along with the P.U. Enamel for
testing.
4.1.1 For the preparation of painted panels for conducting different tests mentioned in
Table-1 the details given in Table –2 shall be followed.
5.1.1 Each component, as delivered, shall be free of gel, coarse particles, skins, foreign
matter and sediments. Any sediment, that does form, must be easy to stir up with
a high speed stirrer for 10 minutes maximum, in order to give a homogeneous
paint.
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TABLE 1
(Continued from pre page)
20 Accelerated Tests The film shall not show any signs Appendix-V
(a) Resistance to 30% Sulphuric of blistering, wrinkling & lifting.
acid (weight by volume) Difference in gloss and colour
between immersed & unimmersed
area of painted panel shall be
70%, minimum and 7 out of 10
max. respectively
Resistance to 20% caustic potash -do-
(weight by volume)
Resistance to oil -do-
Resistance to solvents -do-
Resistance to water -do-
21- Durability Tests Rating 0-10 Appendix-VI
Accelerated weathering test scale
Chalking 10
Checking 10
Cracking 10
Flaking 10
Spotting 10
Blistering 10
Corrosion No corrosion
Colour change 7
Gloss The film shall
have a
minimum gloss
retention of
80% of its initial
value at 600
angle of
incidence
22 Humidity test. No sign of corrosion & no sign of IS: 101-88 (Part 6 /Sec.
deterioration viz. blistering, 1)
detachment of film up to 500 hrs
150 x 50 --do--
Resistance to oil Tinn x 0.315 Min 190 -do- -do- -do-
ed microns
10. Humidity Test M.S 150 x 75 x 1.25 Prepare and Min190 -do- -do- See Appendix
paint both sides microns IV
of the panels as
per Appendix-IV
11. Abrasion M.S 100 x 100 x 1.25 Double coat of Min 70 -do- -do- -
resistance test Centrally located PU enamel full microns
hole of size as per gloss (2
specific design of component)
the testing
machine
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APPENDIX – I
1. SCOPE :
This method is applicable for determination of the volume solids percentage of paint
coatings.
2. SIGNIFICANCE :
This method is intended to provide a measure of the volume of dry coating obtainable from
a given volume of liquid coating. This volume is considered to be the most equitable means
of comparing the coverage (sq metre of surface covered at a specific film thickness per unit
volume) and also for calculating the wet film thickness of the given paint.
3. APPARATUS :
4. PROCEDURE :
(i) Dry the disc in an oven at 105oC for 10 minutes and cool.
(ii) Weight the disc in air. Let it be W1 grams.
(iii) Suspend the disc in water and weigh again. Let it be W2 grams.
(iv) Calculate the volume of the disc V as follows :
W1 – W2
V = ---------------- where d is the density of the water at room
d
temperature
(v) Determine the weight of non volatile content of the liquid coating material by drying
a known amount of paint at 105o C for 3 hours. Let it be W grams.
vi) Determine the specific gravity of the paint to the nearest 0.001 g/ml by using weight
per gallon cup. Let it be P
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iv) Dip the disc in the paint sample for 10 minutes and take out the disc and allow the excess
coating material to drain off. Blot the coating material off the bottom edge of the disc so
that heads or drops do not dry on the bottom edge of the disc.
vii) Suspend the coated disc in water and weigh again. Let it be W4 grams.
V1 – V Vd
---------------- X 100 (OR) -------- X 100
Vw Vw
The volume of non-volatile matter or the percentage volume solids of a paint is related to the
covering capacity and thickness in the following manner:-
APPENDIX – II
Take the usable time as the pot life of paint. Condition the components of the
coating for one hour at 27± 2 0C and mix immediately in proper ratio to get approx.
200 ml. of paint in 250 ml. of container. The lid should be loosely placed on the
container.
Measure the viscosity initially and every hour thereafter. However, the interval
may be shortened, if desired.
Near the end of the paint‟s working life, the viscosity builds-up rapidly. During this
period, when it appears the paint may be too viscous to spray, remove a small
portion and add the appropriate thinner. If the paint can still be thinned, the end of
the working life has not been reached. The end of the working life is reached
when the paint gels, becomes stringy or cannot be thinned for application.
APPENDIX- III
KEEPING PROPERTIES
When stored under cover in a dry place in the original sealed containers under
normal temperature conditions, the material shall detained the properties
prescribed in the specification for the stipulated period from the date of
manufacture which shall be subsequent to the date of placement of contract.
APPENDIX IV
1. In the painting procedure mentioned below, the air drying of the films shall be
done at temperature of 27± 20C and a relative humidity of 65± 50C
2. The surface of the test panels to be exposed shall be prepared as follows, taking
care that total dry film thickness of the complete system shall be minimum 200
microns.
3. Apply one coat of Epoxy Zinc Phosphate primer by suitable spraying as per
Chapter I, Para 3 conforming to this specification, and allow it to air dry for 24
Hrs.
4. Rub down lightly with waterproof emery paper No.280/320, wipe off the surface
using a piece of clean and dry soft cloth and then apply one coat of P.U.
surfacer by suitable spraying as per Chapter I, Para 3 conforming to this
specification, and allow it to air dry for 24 hrs.
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5. Rub down, wet with waterproof emery paper No.280/320, wipe off the surface
using a piece of clean and dry soft cloth and then apply one coat of P.U. Full
Gloss Enamel by suitable spraying as per Chapter I, Para 3, conforming to this
specification, and allow it to air dry for 24 hrs.
6. Rub down, wet with waterproof emery paper No.220, wash and wipe off water and
when the surface is dry, apply a second coat of P.U. Full Gloss Enamel by
suitable spraying, as per Chapter I, Para 3 conforming to this specification, and
allow it to air dry for 07 days before subjecting to exposure test.
Note: The primer, surfacer and full gloss enamel shall be from the same supplier.
APPENDIX-V
ACCELERATED TESTS
The following short term tests of chemical resistance do not categorize the type of
service for which polyurethane coating are intended but are included to assure the
customer that the coating contains a sufficiency of cured resin to exhibit the long
terms requirements.
Prepare the panels as per Appendix-IV allow the panels to air dry for seven days.
For the immersion test as in (a), (b) and (c), prepare and paint both sides of the
panels and protect the edges of the panels by sealing with a suitable wax.
c) Resistance to Oil
Prepare the panel as per Table 2. Immerse ¾th of the panel in a mineral
lubricating oil (As mentioned in Clause 19.1 of IS: 101-1964) for 2 hours. Remove
the panel and wipe the excess oil with a pad of cotton and wash it with mineral
turpentine oil (MTO) and allow to dry for 30 minutes and record the observation.
d) Resistance to Solvents
Test on panel each for resistance to xylene, ethanol and acetone respectively.
Take white sterilized cotton and soak it in the solvent and place it on the painted
panel without squeezing the cotton. Immediately cover the soaks cotton with a
suitable watch glass and leave it for 3 hours. Remove the watch glass and then
the soaked cotton and wipe the area with a clean dry cotton and immediately
record the observation.
e) Resistance to Water
Immerse ¾th of the panel in water for 240 hours. Remove the panel, wash in
running fresh water and allow it to dry for an hour and record the observation.
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APPENDIX – VI
Both sides of the panels must be prepared and painted as per Appendix -IV and S.No.9
of Table 2: Details of preparing Painted Panels for Full Gloss P.U. Enamel (Two Pack).
The requirements of this test shall be taken to have been satisfied if performance
in respect of the characteristics as noted in Clause D-3.2 of IS : 8662-1993 ( or
corresponding clause of latest version) is within the limits.
ALTERNATE METHOD
The requirements of this test shall be taken to have been satisfied if performance
in respect of the characteristics as noted in Clause D-3.2 of IS : 8662-1993( or
corresponding clause of latest version) is within the limits.
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APPENDIX –VII
PROCEDURE
For identifying aromatic and aliphatic isocyanate solutions (also frequently called
“HARDENER” or “CATALYST SOLUTION”) prepare an approx. 40-50% solution
with acetone into 30 – 50 ml of this solution stir approx. 1 ml of 3% H2O2 solution
in it.
RESULTS
APPENDIX – VIII
1. Procedure
1.2- Add 25 ml of dry toluene (Note 2), place a stopper in the flask, and swirl by hand
or on a mechanical agitator to dissolve the prepolymer. Solution may be aided by
warming in a hot plate.
Note:- If the polymer is insoluble, add 10 ml of dry, analytical made acetone to the
toluene.
1.3- Using a pipette, add 25.00 ml of 0.1 N di-n-butylamine solution and continue
swirling for 15 min. with stopper in place.
1.4- Add 100 ml of isopropyl alcohol and 4 to 6 drops of bromophenol blue indicator
solution. Titrate with 0.1 N hydrochloric acid to a yellow end point.
1.5- Run a blank titration including all reagents above but omitting the specimen.
2. Calculations
(B – V) X N X 0.0420 ]
NCO, % = X 100
W
Where :
APPENDIX-IX
A mild steel panel is dented with a specified numbers of dents and then coated with
epoxy based zinc phosphate primer followed by polyester based putty. It is then suitably
examined at the dents for satisfactory Stopping properties.
Procedure:
Dent a 300 x 150 x0.9 mm mild steel plate with the help of blunt iron ball hammer and
make 10 dents of about 3 mm diameter and 1 mm deep. The dents shall be so made that
they are 50 mm away from the side of the panels and 50 mm apart from one another.
Roughen the panel with emery paper no. 180. Wipe this with petroleum hydrocarbon
solvent, 145/205 (low aromatic) (see IS: 1745- 1978) and allow to dry. Apply one coat of
epoxy based zinc phosphate primer to produce minimum 60 microns DFT and air dry for
8 hrs, minimum. Make 3 applications of polyester based putty giving an interval of not less
than 8hrs. and not more than24 hrs. between successive applications, each having dry film thickness
of 350 microns, minimum. Keep the panel vertically.
The material shall be deemed to have passed the test if there is no sagging after 2 hours,
after every application at the dents, it works hard in 8 hours and shows no sign of crack or
shrinkage after 18 hours.
APPENDIX-X
The material in a specified film thickness is applied on a mild steel panel. The film when
dry is tested for its rubbing properties by rubbing with abrasive paper.
PROCEDURE:
Take 300 x 150 x0.9 mm mild steel plate . Roughen the panel with emery paper no. 180.
Wipe this with petroleum hydrocarbon solvent, 145/205 (low aromatic) (see IS: 1745-
1978) and allow to dry .Apply one coat of epoxy based zinc phosphate primer to produce
minimum 60 microns DFT, air dry for 8 hrs, followed by one coat of polyester based putty
having dry film thickness of 300 microns ,minimum.
The film prepared as above shall be suitable for dry rubbing with 150 grade paper and
wet rubbing with 280 grade water proof abrasive paper without any clogging of the paper.
After rubbing down, the surface shall not show defects like roughness, scratches, cracks,
pin holes etc.. Minor pin holes or scratches which will duly be filled by subsequent coat of
PU under coat paint shall not be the cause for rejection.
Ref.-MCM-1706 Page 30 of 31 Effective from March 2013 Specification No. M&C/PCN/100/2013
APPENDIX-XI
1. Outline of method:
The material is tested in a painting system and schedule simulating actual use. Finish
with uniformity of colour and gloss is taken as criteria for having passed the test.
2. Procedure:
A panel of 300 x 150 x 0.9 mm, mild steel with full paint system shall be prepared as
described below:
a) Clean the surface either by shot or grit blast/ phosphating / any appropriate chemical
treatmen/roughen the panel with emery paper no. 180 and wipe this with petroleum
hydrocarbon solvent, 145/205 (low aromatic) (see IS: 1745- 1978) and allow to dry.
b) apply one coat of epoxy based zinc phophate primer (two pack) , 60 microns,
minimum DFT as per the specification and allow to air dry for 8 hours, minimum . Dry
rub with emery paper no. 400 and wipe clean with a dry soft cloth.
c) Make 3 applications of polyester based putty with a suitable knife, each application
having a dry film thickness of 350 microns, minimum , at an interval of not less than
8hrs. and not more than 24 hrs. between successive applications. The over all dry film thickness of
3 applications shall be minimum 1000 microns. Allow the final coat to air dry for at least
8 hours and not more than 24 hours. Wet rub with 280 grade water proof abrasive
paper and allow to dry.
d) apply one coat of polyurethane surfacer (two- pack) , 60 microns, minimum DFT , as
per the specification. Allow to air dry for 8 hours, minimum. Dry rub with emery paper
no. 400 and clean the surface .
e) apply two coats of full gloss polyurethane enamel ( two-pack)of 35microns ,minimum
DFT per coat, as per the specification at an interval of 8 hours, minimum between 1st
and 2nd coat.. Allow to air dry for at least 48 hours before assessing the performance.
3. The material shall be deemed to have passed the test, if the resultant finish is
uniform all over the surface with regard to gloss and colour. The gloss when measured
shall have a value specified in the specification.
Ref.-MCM-1706 Page 31 of 31 Effective from March 2013 Specification No. M&C/PCN/100/2013
APPENDIX-XII
1. Outline of method:
The material is tested in a painting system and schedule simulating actual use.
Satisfactory adhesion and compatibility between the coats is taken as criteria for having
passed the test.
3. Procedure:
A panel 300x150x0.9 mm, mild steel, with full paint system shall be prepared as
described below:
a) Clean the surface either by shot or grit blast/ phosphating / any appropriate chemical
treatment/ roughen the panel with emery paper no. 180 and wipe this with petroleum
hydrocarbon solvent, 145/205 (low aromatic) (see IS: 1745- 1978) and allow to dry.
b) Apply one coat of epoxy based zinc phosphate primer (two pack), 60 microns,
minimum DFT as per the specification and allow to air dry for at least 8 hours, minimum .
Dry rub with emery paper no. 400 and wipe clean with a dry soft cloth.
c) Make 3 applications of polyester based putty with a suitable knife, each application
having a dry film thickness of 350 microns, minimum , at an interval of not less than 8hrs.
and not more than 24 hrs between successive applications. The over all dry film thickness of 3
applications shall be minimum 1000 microns. Allow the final coat to air dry for at least 8
hours and not more than 24 hours. Wet rub with 280 grade water proof abrasive paper
and allow to dry.
d) Spray apply one coat of polyurethane surfacer (two- pack), 60 microns, minimum DFT,
as per the specification. Allow to air dry for 8 hours, minimum .Dry rub with emery paper
no. 400 and clean the surface.
e) apply two coats of full gloss polyurethane enamel ( two-pack), minimum 40 microns
DFT per coat, as per the specification at an interval of 8 hours, minimum between 1st
and 2nd coat. Allow to air dry for at least 7 days before assessing the performance.
.
3.The material shall be deemed to have passed the test, if the material shows good
adhesion over substrate and between various coats, and compatibility between primer,
putty ,surfacer and finish coat of the system.
This is assessed as per Test Method B-Cross Cut Tape Test of ASTM D 3359-97 by
making grid and placing 25 mm wide adhesive tape, semi transparent, pressure
sensitive, Parmacel 99 make or equivalent. The adhesive tape is then pulled away with a
jerk. The material shall be deemed to have passed the test, if the edges of the cuts are
completely smooth, none of the squares of the lattice is detached i e. it matches to 5B
class of the above mentioned specification.