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An American National Standard

Designation: F 1055 – 98e1

Standard Specification for

Electrofusion Type Polyethylene Fittings for Outside
Diameter Controlled Polyethylene Pipe and Tubing1
This standard is issued under the fixed designation F 1055; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

e1 NOTE—Keywords were editorially added in November 2003.

1. Scope D 2122 Test Method for Determining Dimensions of Ther-

1.1 This specification covers electrofusion polyethylene fit- moplastic Pipe and Fittings3
tings for use with outside diameter-controlled polyethylene D 2447 Specification for Polyethylene (PE) Plastic Pipe,
pipe, covered by Specifications D 2447, D 2513, D 2737, Schedules 40 and 80, Based on Outside Diameter3
D 3035, and F 714. Requirements for materials, workmanship, D 2513 Specification for Thermoplastic Gas Pressure Pipe,
and testing performance are included. Where applicable in this Tubing, and Fittings3
specification “pipe” shall mean “pipe” or “tubing.” D 2737 Specification for Polyethylene (PE) Plastic Tubing3
1.2 The values stated in inch-pound and centigrade tempera- D 3035 Specification for Polyethylene (PE) Plastic Pipe
ture units are to be regarded as standard. The values given in (SDR-PR) Based on Controlled Outside Diameter3
parentheses are for information only. D 3350 Specification for Polyethylene Plastic Pipe and
1.3 The following safety hazards caveat pertains only to the Fittings Materials4
test method portion, Section 9, of this specification: This F 412 Terminology Relating to Plastic Piping Systems3
standard does not purport to address all of the safety concerns, F 714 Specification for Polyethylene (PE) Plastic Pipe
if any, associated with its use. It is the responsibility of the user (SDR-PR) Based on Outside Diameter3
of this standard to establish appropriate safety and health F 905 Practice for Qualification of Polyethylene Saddle
practices and determine the applicability of regulatory limita- Fusion Joints3
tions prior to use. 3. Terminology
2. Referenced Documents 3.1 Definitions—Definitions are in accordance with Termi-
2.1 ASTM Standards: nology F 412, and abbreviations are in accordance with Ter-
D 618 Practice for Conditioning Plastics and Electrical minology D 1600, unless otherwise specified.
Insulating Materials for Testing2 3.2 Definitions of Terms Specific to This Standard:
D 638 Test Method for Tensile Properties of Plastics2 3.2.1 electrofusion—a heat fusion joining process where the
D 1248 Specification for Polyethylene Plastics Molding and heat source is an integral part of the fitting, such that when
Extrusion Materials2 electric current is applied, heat is produced that melts and joins
D 1598 Test Method for Time-to-Failure of Plastic Pipe the plastics.
Under Constant Internal Pressure3 3.2.2 fusion interface—surface in the heat fusion process
D 1599 Test Method for Short-Time Hydraulic Failure Pres- where the plastic materials of the products being joined bond
sure of Plastic Pipe, Tubing, and Fittings3 together.
D 1600 Terminology Relating to Abbreviations, Acronyms, 3.2.3 fusion zone length—total length of the melted material
and Codes for Terms Relating to Plastics2 in the fitting cross-section under evaluation.
4. Materials and Manufacture
1
This specification is under the jurisdiction of ASTM Committee F-17 on Plastic 4.1 This specification covers fittings made from polyethyl-
Piping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings. ene compounds as defined in Specifications D 1248 or D 3350.
Current edition approved April 10, 1998. Published December 1998. Originally
published as F 1055 – 87. Last previous edition F 1055 – 95a.
2
Annual Book of ASTM Standards, Vol 08.01.
3 4
Annual Book of ASTM Standards, Vol 08.04. Annual Book of ASTM Standards, Vol 08.02.

Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.

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 F 1055 – 98e1
4.2 Rework Material—Clean rework polyethylene material 5.5 Joint Integrity Tests—(Couplings and Saddle Type
of the same resin, free of any wire or contaminants generated Joints)—The joint made on the specimen shall meet the
from the fitting manufacturer’s own production, may be used requirements in 9.4 and 9.5 of this specification, when tested in
by the same manufacturer, as long as the fittings produced accordance with 9.4.
conform to the requirements of this specification.
4.3 Heating Mechanism—The heat mechanism shall be of 6. Dimensions, Mass, and Permissible Variations
materials not detrimental to the performance of the fitting or 6.1 Dimension and tolerances of electrofusion fittings must
the pipe to which it is intended to be joined. be such that heat fusion is possible to outside diameter (OD)
controlled PE pipes such as those listed in Specifications
5. Performance Requirements D 2447, D 2513, D 2737, D 3035, and F 714, such that the
joints will satisfy the performance requirements in Section 5.
5.1 The following requirements are for electrofusion joints 6.2 Because of the varying designs for electrofusion fittings,
that have been joined using the manufacturer’s recommended the actual spread of dimensions may be quite different from
joining procedures. These requirements must be met by each manufacturer to manufacturer. A table of dimensions and
electrofusion joint design, on each size and type of pipe tolerances encompassing these differences would be meaning-
material for which the manufacturer recommends use of his less and without value and, therefore, is omitted from this
fitting. Any revisions to the electrofusion joint design or specification.
processing by the manufacturer after the initial testing requires 6.3 The manufacturer shall furnish to the user the electrical
retesting to ensure these requirements can still be met. Fittings resistance, critical dimensions, and tolerances of his fittings.
intended for use in the distribution of natural gas or liquid This information must include at least the following dimen-
petroleum gas shall also meet the requirements of Specification sions and tolerances:
D 2513. 6.3.1 Coupling inside diameter,
5.1.1 It is not required that each configuration of a fitting be 6.3.2 Temperature joining limits, and
tested to meet all of these qualifications (that is, 2 in. main 6.3.3 Operating pressure of the fitting.
saddle joint with multiple outlet configurations offered) as long NOTE 2—There are other items that fall beyond the scope of this
as the electrofusion joint design is not altered in the configu- specification which would be of interest to the user for proper application
ration differences. of the fittings and is recommended as additional information to be
furnished. A few of these are: (1) maximum pipe out of round allowed at
NOTE 1—It is permissible when accomplishing these tests, to do so on joint area; (2) minimum/maximum pipe SDR capability of the fitting, and
the highest and lowest dimension ratio of the same pipe material. If in (3) for saddles intended for use on a live main, the maximum allowable
those tests all performance requirements are met, all dimension ratios line pressure when making the joint.
between those tested may be considered as having met the requirements.
These tests do not have to cover the full range of dimension ratios 7. Workmanship, Finish, and Appearance
available, only the dimension ratio range on which the manufacturer 7.1 The manufacture of these fittings shall be in accordance
recommends his fitting be used.
with good commercial practice so as to produce fittings
5.2 Pressure Requirements: meeting the requirements of this specification.
5.2.1 Minimum Hydraulic Burst Pressure— The minimum 7.2 The fittings shall be homogeneous throughout, except
hydraulic burst pressure of the test specimen shall not be less where a heating coil or electrical connectors are incorporated,
than that required to produce 2520 psi (17.4 MPa) fiber stress and free of cracks, holes, foreign inclusions, or injurious
in the pipe being used in the test when tested in accordance defects such as gouges, dents, cuts, etc. The fittings shall be as
with 9.1. The test equipment, procedures, and failures defini- uniform as commercially practicable in opacity, density, and
tions shall be as specified in Test Method D 1599. other physical properties. Any heating coils, connecting cables,
connectors, and related electrical power source shall be de-
5.2.2 Sustained Pressure—The fitting and fused joint shall
signed to prevent electrical shock to the user.
not fail when tested in accordance with 9.2.
5.3 Tensile Strength Requirements (Coupling Type Joints 8. Specimen Preparation
Only)—The fitting or the pipe to fitting joint made on pipe shall 8.1 Conditioning:
not fail when tested in accordance with 9.3. Specimens shall be 8.1.1 Unless otherwise specified, condition the specimens
subjected to a tensile stress that causes the pipe to yield to an (pipe and fittings) prior to joining at the minimum pipe
elongation no less than 25 % or causes the pipe to break temperature allowable for fusion as recommended by the
outside the joint area. Tensile tests must be made on specimens manufacturer, for not less than 16 h and make the fusion joint
as joined, not on straps cut from the specimen. Yielding must at that temperature for those tests where conditioning is
be measured only in the pipe, independent of the fitting or joint. required.
5.4 Impact Resistance (Saddle Type Joints Only)—The joint 8.1.2 Unless otherwise specified, condition the specimens
made on the specimen shall not fail when impacted with a force (pipe and fittings) prior to joining at the maximum pipe
sufficient to break the body or other portion of the specimen. temperature allowable for fusion as recommended by the
Tests of 500 ft·lbf or higher impact with no failures noted shall manufacturer, for not less than 16 h and make the fusion joint
be considered as a “pass” impact test. The device for testing at that temperature for those tests where conditioning is
and the methods shall be as defined in Practice F 905. required.

2
 F 1055 – 98e1
8.2 Test Conditions—Conduct the tests at the Standard 9.2.4 Failure of any one of the four specimens shall consti-
Laboratory Temperature of 23 6 2°C (73.4 6 3.6°F) unless tute failure of the test. Failure of one of the four specimens
otherwise specified. tested is cause for retest of four additional specimens, joined at
8.3 Preparation of Specimens for Testing: the failed-specimens-joining temperature. Failure of any of
8.3.1 Prepare test specimens so that the minimum length of these four additional specimens constitutes a failure of the test.
unreinforced pipe on one side of any fitting is equal to three 9.3 Tensile Strength Test:
times the diameter of the pipe, but in no case less than 12 in. 9.3.1 Select four fittings at random and prepare specimens
(304 mm). It is permissible to test multiple fittings together in accordance with Section 8 with the exception that it is
provided they are separated by a minimum distance equal to permissible, on pipe sizes above 4 in. (102 mm) IPS, if limits
three times the diameter of the pipe, but in no case less than 12 of tensile machine will not allow 25 % elongation with pipe
in. (304 mm). specimens of three-pipe diameters, to test with free pipe
8.3.2 Fuse all fitting outlets with the appropriate size pipe in lengths of 20 in. (304-mm) minimum. From the four speci-
accordance with the manufacturer’s recommended procedures. mens, condition two specimens each in accordance with 8.1.1
8.3.3 All saddle fusion joint specimens conditioned as in and 8.1.2.
8.1.2 and destined for quick burst testing as in 9.1 and 9.3.2 Test the specimens using the apparatus of Test Method
sustained pressure testing as in 9.2, are to be joined with the D 638. Test at a pull rate of 0.20 in. (5.0 mm) per min, 625 %.
pipe at no less than maximum allowable operating pressure of 9.3.3 Failure of the fitting or joint as defined in 5.3, shall
the pipe system or fitting, whichever is lowest, when being constitute specimen failure.
prepared for those tests. The pipe should be left under pressure 9.3.4 Failure of any one of the four specimens shall consti-
for a time period not less than recommended by the manufac- tute failure of the test. Failure of one of the four specimens
turer for cooling in the field prior to disturbing the joint. Saddle tested is cause for retest of four additional specimens, joined at
joint specimens destined for mechanical/destructive type tests the failed specimens joining temperature. Failure of any of
such as impact as in 5.4 or crush tests as in 9.4, or specimens these four additional specimens constitutes a failure of the test.
conditioned for cold temperature joining as in 8.1.1, may be 9.4 Joint Integrity Tests—Illustrations of joint crush tests for
made on unpressured pipe specimens. socket type joints and saddles are offered in 9.4.1 and 9.4.2 as
test methods that are useful as an evaluation of bonding
9. Test Methods strength between the pipe and fitting. Alternately, the fusion
evaluation test (FET) offered in 9.4.3 and 9.4.4 may be used in
9.1 Minimum Hydraulic Burst Pressure Test:
lieu of the crush test. Similar test evaluations as specified in the
9.1.1 Select four fittings at random and prepare specimens
contract or purchase order and as agreed upon by the purchaser
in accordance with Section 8. From the four specimens,
and manufacturer are of equal value in performing such
condition two specimens each in accordance with 8.1.1 and
evaluations and may be substituted with such agreement.
8.1.2.
9.4.1 Joint Crush Test:
9.1.2 Test the specimens in accordance with Test Method 9.4.1.1 Select four fittings at random and prepare specimens
D 1599. in accordance with Section 8. From the four specimens,
9.1.3 Failure of the fitting or joint shall constitute specimen condition two specimens each in accordance with 8.1.1 and
failure. 8.1.2 (Note 3).
9.1.4 Failure of any one of the four specimens shall consti-
tute failure of the test. Failure of one of the four specimens NOTE 3—It is permissible to utilize in joint integrity testing, specimens
from the quick-burst tests conducted in 9.1 after visually determining that
tested is cause for retest of four additional specimens, joined at
neither the joint area nor the pipe segment to be crushed was a part of the
the failed specimens joining temperature. Failure of any of failure mode in the quick-burst test.
these four additional specimens constitutes a failure of the test.
9.2 Sustained Pressure Test: 9.4.1.2 Slit socket joints longitudinally as illustrated in
9.2.1 Select four fittings at random and prepare specimens Fig. 1 as near the centerline of the pipe as practical. Pipe
in accordance with Section 8 of this specification. From the lengths extending out of the socket may be cut back to a
four specimens, condition two specimens each in accordance minimum of 3 in. (76 mm) for ease of placing in a vise.
with 8.1.1 and 8.1.2. 9.4.1.3 Place each specimen half in a vise such that the
outermost wire of coil is within 1.250 6 0.125 in. (32 6 3 mm)
9.2.2 Test the specimens in accordance with Test Method
of vise jaws, with the jaws closing only on the pipe portion of
D 1598. All tests shall be conducted at 80 6 2°C. The
the specimen (Fig. 2).
assemblies are to be subjected to pipe fiber stresses of 580 psi
(4.0 mPa) for 1000 h or 670 psi (4.6 mPa) for 170 h. Joint
specimens shall not fail within these time periods. Any failures
within these time periods must be of the pipe, independent of
the fitting or joint and must be of a“ brittle” type pipe failure,
not “ductile.” If ductile pipe failures occur, reduce the pressure
of the test and repeat until 170- or 1000-h results or pipe brittle
failures are achieved.
9.2.3 Failure of the fitting or joint shall constitute specimen
failure. FIG. 1 Preparation of Coupling Specimen for Crush Test

3
 F 1055 – 98e1

FIG. 3 Coupling Crush Test

9.4.2.3 Place the specimen in vise jaws as shown in Fig. 5,

such that vise jaws are within 1⁄2 in. of saddle bottom and the
FIG. 2 Coupling Crush Test Arrangement jaws will close only on the pipe portion of the specimen.
Saddle designs incorporating a bottom half saddle will need the
bottom half removed for this test. Saddle designs incorporating
9.4.1.4 Tighten the jaws of the vise on the pipe until the a full-wrap single piece saddle are to be tested as in 9.4 socket
inner walls of the pipe meet (Fig. 3). Repeat crush test on both type joints (Fig. 2 and Fig. 3).
halves and each end of specimen, at all ends, where a joint 9.4.2.4 Tighten the jaws of the vise on the pipe until the
exists. inner walls of the pipe meet (Fig. 6).
9.4.1.5 Separation of the fitting from the pipe at the fusion 9.4.2.5 Separation of the fitting from the pipe at the fusion
interface constitutes a failure of the test. Some minor separa- interface constitutes a failure of the test. Some minor separa-
tion at the outer limits of the fusion heat source up to 15 % of tion at the outer limits of the fusion heat source up to 15 % of
the fusion length may be seen. This does not constitute a the fusion length may be seen. This does not constitute a
failure. Ductile failure in the pipe, fitting, or the wire insulation failure. Ductile failure in the pipe, fitting, or the wire insulation
material, is acceptable as long as the bond interface remains material, is acceptable as long as the bond interface remains
intact. intact.
9.4.1.6 Failure of any one of the four specimens shall 9.4.2.6 Failure of any one of the four specimens shall
constitute failure of the test and is cause for retest of four constitute failure of the test and is cause for retest of four
additional fittings, joined at the same temperature as the failed additional fittings, joined at the same temperature as the failed
specimens. Failure of any of these four additional specimens specimens. Failure of any of these four additional specimens
constitutes a failure of the test. constitutes a failure of the test.
9.4.2 Saddle Type Joint Crush Test (Not Full-Wrap Design): 9.4.3 Fusion Evaluation Test (FET) of Sockets:
9.4.2.1 Select four fittings at random and prepare specimens 9.4.3.1 Select four fittings at random and prepare specimens
in accordance with Section 8. From the four specimens, in accordance with Section 8. From the four specimens,
condition two specimens each in accordance with 8.1.1 and condition two specimens each in accordance with 8.1.1 and
8.1.2 (see 9.4). 8.1.2.
9.4.2.2 Pipe lengths extending from saddle joint may be cut 9.4.3.2 A band saw with a locking guide and a blade
back clear up to the outer edges of the saddle for convenience restricted to cutting plastic is recommended for obtaining the
of handling, if desired, however, it is not necessary. The length FET samples. Slit the socket in the order of cuts as illustrated
of the pipe extending beyond the saddle is not important to this in Fig. 7. First, radially cut the socket in half along the
test (Fig. 4). centerline of the joint. Pipe extending from the fittings may be

4
 F 1055 – 98e1

FIG. 4 Preparation of Saddle Specimen for Crush Test

FIG. 5 Saddle Fitting Crush Test Before Crush

cut back to about 1 in. from the fitting edge. Cut FET FIG. 6 Saddle Fitting Crush Test After Crush
specimens approximately 1⁄16 in. wide from each joint half. A
minimum of four FET strips shall be cut from one half of the in the pipe, fitting, or the wire insulation material is acceptable
socket and spaced approximately 90° apart. as long as the bond interface remains intact.
9.4.3.3 Grip an FET specimen in a vise or clamping device 9.4.3.5 Failure of any one of the four joints shall constitute
as shown in Fig. 8 so that the bond line between the pipe and failure of the test and is cause for retest using four additional
fitting is at least 1⁄16 in. from the edges of the clamping device. fittings joined at the same conditions as the failed joint
Flex the specimen four times 90° in both directions. Pliers may specimens. Failure of any of these four additional joint
be used in lieu of a vise as long as the entire length of the specimens constitutes a failure in the test.
fusion is flexed. 9.4.4 Fusion Evaluation Test of Saddle Type Joints (Not
9.4.3.4 Separation of the specimen along the bond line Full-Wrap Design):
constitutes failure of the specimen. Some minor separation at 9.4.4.1 Select four fittings at random and prepare specimens
the outer limits of the fusion heat source may be seen or there in accordance with Section 8. From the four specimens,
may be voids between wires. This does not constitute failure as condition two specimens each in accordance with 8.1.1 and
long as the voids do not exceed the limits of 9.5. Ductile failure 8.1.2.

5
 F 1055 – 98e1

FIG. 7 Recommended Procedure for Cutting FET Strip From Coupling

FIG. 8 Strip for FET Bend Test

near the fusion interface may be exposed. The voids, should

9.4.4.2 A band saw with a locking guide and a blade they be present, are a phenomenon of the electrofusion process,
restricted to cutting plastic is recommended for obtaining the due to trapped air and shrinking during the cooling process
FET samples. Remove the stack from the fitting and cut the after the joint is made. If detected, such voids are considered
bottom portion of the pipe from the test piece. Cut the saddle acceptable only if round or elliptical in shape, with no sharp
in half in the transverse direction and then cut each half again corners allowed and if they meet the limitations of 9.5.1
in the longitudinal direction as shown in Fig. 9. Cut FET through 9.5.3.
specimens approximately 1⁄16 in. wide through the fusion base 9.5.1 Voids that do not exceed 10 % of the fusion zone
of the saddle fitting. These cuts must be both longitudinal and length in size are acceptable. (See Fig. 10.)
transverse using two diagonal quarters for transverse direction 9.5.2 Multiple voids, if present, are acceptable if the com-
and the two remaining quarters for the longitudinal direction. bined void sizes do not exceed 20 % of the fusion zone length.
9.4.4.3 Inspect the fusion area for any discontinuities. Fol- (See Fig. 10.)
low the instructions in 9.4.3.3 to test the FET samples. 9.5.3 If voids are exposed, additional longitudinal cuts
9.4.4.4 Separation of the specimen along the bond line should be made to ensure that the void does not follow a
constitutes failure of the specimen. Some minor separation at diametric path which connects to the pressure-containing area
the outer limits of the fusion heat source may be seen or there of the joint. (See Fig. 11.)
may be voids between wires. This does not constitute failure as
long as the voids do not exceed the limits of 9.5. Ductile failure NOTE 4—Some voids in electrofusion fitting joints may be due to the
in the pipe, fitting, or the wire insulation material is acceptable natural phenomenon described in 9.5. It is also possible the voids can be
as long as the bond interface remains intact. produced by not following proper fusion procedures. If voids are detected,
one should ensure that all procedures were followed in making the joint.
9.4.4.5 Failure of any one of the four joints shall constitute
failure of the test and is cause for retest using four additional 10. Product Marking
fittings, joined at the same conditions as the failed joint
specimens. Failure of any of these four additional joint 10.1 Fittings shall be marked with the following:
specimens constitutes a failure in the test. 10.1.1 Manufacturer’s name or trademark,
9.5 Evaluation for Voids—When dissecting electrofusion 10.1.2 Material designation (for example, PE2306, PE3408,
joints for the integrity tests in 9.4, or any reason, voids at or etc.),

6
 F 1055 – 98e1

FIG. 9 Procedure for Cutting FET Strips from a Saddle

10.1.4 Size, followed by “IPS” or “CTS” designation,

10.1.5 This designation ASTM F 1055,
10.1.6 The fittings shall bear an appropriate code number
that will assure identification on the fittings as to date of
production and resin formulas used in the production of said
fittings. The manufacturer shall maintain such additional
records as are necessary to confirm identification of all coded
fittings, and
10.1.7 Where the size of the fitting does not allow complete
marking, identification marking may be omitted in the follow-
FIG. 10 Coupling Fusion Assembly With Possible Void ing sequence: ASTM designation number, and material desig-
Characteristics nation.
10.2 All required markings shall be legible and so applied as
to remain legible under normal handling and installation
practices. If indentation is used, it shall be demonstrated that
these marks have no effect on the long term strength of the
fitting.
10.3 When the product is marked with this ASTM designa-
tion“ F 1055,’’ the manufacturer affirms that the product was
manufactured, inspected, sampled, and tested in accordance
with this specification and has been found to meet the
requirements of this specification.
11. Quality Assurance
FIG. 11 Coupling Fusion Assembly—Further Examination 11.1 When the product is marked with this designation,
Guidance
F 1055 the manufacturer affirms that the product was manu-
factured, inspected, sampled, and tested in accordance with this
10.1.3 For fittings intended for transporting potable water, specification and has been found to meet the requirements of
the seal of approval of an accredited laboratory, for fittings this specification.
complying with Specification D 2513 and intended for gas
distribution, the word “gas” or if space does not permit, the 12. Keywords
letter “G,” 12.1 electrofusion; fittings; joining; polyethylene

7
 F 1055 – 98e1

ANNEX

(Mandatory Information)

A1. IN-PLANT QUALITY CONTROL PROGRAM FOR ELECTROFUSION FITTINGS

A1.1 Introduction: A1.2.2.3 Heating Element Resistance—Immediately pro-

A1.1.1 Use the following in-plant quality control program, ceeding production start up, then once per h, or one out of ten
covering material and performance requirements in manufac- fittings, whichever is less frequent.
ture to provide reasonable assurance that the product meets the A1.2.3 Molding or Extrusion Quality—Make the following
requirements of this specification and normally anticipated tests on each cavity in the mold or each extrusion line being
field performance requirements. used. Test at the start of each production run, whenever
production conditions have changed or when the resin lot has
A1.2 Fittings Tests: changed, but not less than once per 500 fittings thereafter.
A1.2.1 Conduct the fittings tests at the frequencies indicated A1.2.3.1 Voids in Part—Inspect for voids in the fitting by
as follows: means of X-ray or dissection of the fitting in 0.25-in. (6-mm)
NOTE A1.1—When any failure to meet the requirements of this wide strips.
specification occurs, make additional tests to ascertain those fittings that A1.2.3.2 Molding Knit Line Strength—Test by one of the
are acceptable, back to the last acceptable ones. Those that do not meet the following tests, or other suitable tests:
requirements must be rejected.
(a) (a) By crushing a fitting or a portion of a fitting in a
A1.2.2 Dimensions of fusion area with heating element in manner that applies load in a direction normal to the knit line.
place:
(b) By performing an apparent tensile strength test of a ring
A1.2.2.1 Socket Diameters—Immediately proceeding pro-
cut from a fitting with the load oriented normal to the knit line.
duction start up, then once per h, or one out of ten fittings,
whichever is less frequent. (c) By performing a burst test of the fitting in accordance
A1.2.2.2 Saddle Sizes—Main sizes and branching outlet with Test Method D 1599.
sizes, immediately proceeding production start up, then once NOTE A1.2—Separation in the knit line of any of these tests constitutes
per h, or one out of ten fittings, whichever is less frequent. a failure of the test.

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