CELCON® M90™ - POM

Description
Celcon acetal copolymer grade M90™ is a medium viscosity polymer providing optimum performance in general purpose injection molding and
extrusion of thin walled tubing and thin gauge film. This grade provides overall excellent performance in many applications. Chemical abbreviation
according to ISO 1043-1: POM Please also see Hostaform® C 9021.

Physical properties Value Unit Test Standard

Density 1410 kg/m³ ISO 1183
Melt volume rate, MVR 8 cm³/10min ISO 1133
MVR temperature 190 °C ISO 1133
MVR load 2.16 kg ISO 1133
Molding shrinkage, parallel 2.0 % ISO 294-4, 2577
Molding shrinkage, normal 1.9 % ISO 294-4, 2577
Water absorption, 23°C-sat 0.75 % ISO 62
Humidity absorption, 23°C/50%RH 0.2 % ISO 62

Mechanical properties Value Unit Test Standard

Tensile modulus 2760 MPa ISO 527-2/1A
Tensile stress at yield, 50mm/min 65 MPa ISO 527-2/1A
Tensile strain at yield, 50mm/min 10 % ISO 527-2/1A
Tensile creep modulus, 1h 2450 MPa ISO 899-1
Tensile creep modulus, 1000h 1350 MPa ISO 899-1
Flexural modulus, 23°C 2550 MPa ISO 178
Flexural stress at 3.5% strain 73 MPa ISO 178
Charpy impact strength, 23°C 188 kJ/m² ISO 179/1eU
Charpy impact strength, -30°C 181 kJ/m² ISO 179/1eU
Charpy notched impact strength, 23°C 6 kJ/m² ISO 179/1eA
Charpy notched impact strength, -30°C 6 kJ/m² ISO 179/1eA
Izod impact notched, 23°C 5.7 kJ/m² ISO 180/1A
Izod impact notched, -30°C 5.5 kJ/m² ISO 180/1A
Compressive stress at 1% strain 26 MPa ISO 604
Compressive stress at 6% strain 88 MPa ISO 604

Thermal properties Value Unit Test Standard

Melting temperature, 10°C/min 165 °C ISO 11357-1/-3
DTUL at 1.8 MPa 101 °C ISO 75-1, -2
DTUL at 0.45 MPa 158 °C ISO 75-1, -2
Vicat softening temperature, 50°C/h 50N 161 °C ISO 306
Coeff. of linear therm expansion, parallel 1.2 E-4/°C ISO 11359-2
Coeff. of linear therm expansion, normal 1.2 E-4/°C ISO 11359-2
Melting point 165 °C Internal

Electrical properties Value Unit Test Standard

Volume resistivity 8E12 Ohm*m IEC 60093
Surface resistivity 3E16 Ohm IEC 60093

Test specimen production Value Unit Test Standard

Processing conditions acc. ISO 9988-2 - Internal
Injection Molding, melt temperature 205 °C ISO 294
Injection Molding, mold temperature 90 °C ISO 294
Injection Molding, injection velocity 200 mm/s ISO 294
Injection Molding, pressure at hold 86 MPa ISO 294

Rheological calculation properties Value Unit Test Standard

Density of melt 1200 kg/m³ Internal
Thermal conductivity of melt 0.155 W/(m K) Internal

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CELCON® M90™ - POM

Spec. heat capacity melt 2210 J/(kg K) Internal

Eff. thermal diffusivity 4.85E-8 m²/s Internal
Ejection temperature 140 °C Internal

Diagrams

Stress-strain Secant modulus-strain

150 5000
-40 °C -40 °C
23 °C 23 °C

Secant modulus in MPa

40 °C 4000 40 °C
60 °C 60 °C
Stress in MPa

100 Y
80 °C 3000 80 °C
100 °C 100 °C
120 °C 120 °C
Y 2000
50 Y
Y Y - Yield
Y 1000
Y
Y

0 0
0 5 10 15 0 5 10 15
Strain in % Strain in %

Stress-strain (isochronous) 23°C Creep modulus-time 23°C

30
Creep modulus in MPa

2500
1h 5 MPa
10 h 10 MPa
100 h
2000 15 MPa
1000 h 20 MPa
Stress in MPa

20 1500
10000 h 25 MPa

1000
10
500
1E0 1E1 1E2 1E3 1E4
Time in h
0
0 1 2 3 4
Strain in %

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CELCON® M90™ - POM

Stress-strain (isochronous) 40°C Creep modulus-time 40°C

30

Creep modulus in MPa

2500
1h 5 MPa
10 h 10 MPa
100 h
2000 15 MPa
1000 h 20 MPa
Stress in MPa

20 1500
10000 h

1000
10
500
1E0 1E1 1E2 1E3 1E4
Time in h
0
0 1 2 3 4
Strain in %

Typical injection moulding processing conditions

Pre Drying Value Unit Test Standard
Drying time 3-4 h -
Drying temperature 100 - 120 °C -
Temperature Value Unit Test Standard
Zone1 temperature 170 - 180 °C -
Zone2 temperature 180 - 190 °C -
Zone3 temperature 180 - 190 °C -
Zone4 temperature 190 - 200 °C -
Die temperature 190 - 200 °C -
Melt temperature 180 - 200 °C -
Cavity temperature 80 - 120 °C -
Hot runner temperature 180 - 200 °C -
Pressure Value Unit Test Standard
Back pressure max. 40 bar -
Speed Value Unit Test Standard
Injection speed slow-medium - -
Other Value Unit Test Standard
Flow temperature 174 °C Internal
No flow temperature 160 °C Internal

Other text information

Pre-drying
Drying is not normally required. If material has come in contact with moisture through improper storage or handling or through regrind use, drying
may be necessary to prevent splay and odor problems.

Injection molding
Standard reciprocating screw injection molding machines with a high compression screw (minimum 3:1 and preferably 4:1) and low back pressure
(0.35 Mpa/50 PSI) are favored. Using a low compression screw (I.E. general purpose 2:1 compression ratio) can result in unmelted particles and
poor melt homogeneity. Using a high back pressure to make up for a low compression ratio may lead to excessive shear heating and deterioration
of the material.

Melt Temperature: Preferred range 182-199 C (360-390 F). Melt temperature should never exceed 230 C (450 F).

Mold Surface Temperature: Preferred range 82-93 C (180-200 F) especially with wall thickness less than 1.5 mm (0.060 in.). May require mold
temperature as high as 120 C (250 F) to reproduce mold surface or to assure minimal molded in stress. Wall thickness greater than 3mm (1/8 in.)
may use a cooler (65 C/150 F) mold surface temperature and wall thickness over 6mm (1/4 in.) may use a cold mold surface down to 25 C (80 F).
In general, mold surface temperatures lower than 82 C (180 F) may hinder weld line formation and produce a hazy surface or a surface with flow
lines, pits and other included defects that can hinder part performance.

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CELCON® M90™ - POM

Film extrusion
Standard extruders with a length to diameter ratio of at least 20:1 are recommended. The screw should be a high compression ratio of at least 3:1
and preferably 4:1 to assure good melting and melt homogeneity. The design should be approximately 35% each for feed and metering sections
with the remaining 30% as the transition zone.

Melt temperature: 160-220 C (320-430 F)

Other extrusion
Standard extruders with a length to diameter ratio of at least 20:1 are recommended. The screw should be a high compression ratio of at least 3:1
and preferably 4:1 to assure good melting and uniform melt homogeneity. The design should be approximately 35% each for the feed and metering
sections with the remaining 30% as transition zone.

Melt temperature 180-220 C (355-430F)

Profile extrusion
Standard extruders with a length to diameter ratio of at least 20:1 are recommended. The screw should be a high compression ratio of at least 3:1
and preferably 4:1 to assure good melting and melt homogeneity. The design should be approximately 35% each for feed and metering sections
with the remaining 30% as the transition zone.

Melt temperature: 180-220 C (360-430 F).

Sheet extrusion
Standard extruders with a length to diameter ratio of at least 20:1 are recommended. The screw should be a high compression ratio (at least 3:1
and preferably 4:1) to assure good melting and uniform melt homogeneity. The screw design should be approximately 35% each for the feed and
metering sections with the remaining 30% as the transition zone.

Melt temperature 180-190 C (355-375 F).

Blow molding
Consult product information services.

Calandering
Consult product information services.

Compression molding
Consult product information services.

Characteristics

Product Categories
Unfilled

Contact Information

Americas Asia Europe

8040 Dixie Highway 4560 Jinke Road Am Unisys-Park 1
Florence, KY 41042 USA Zhang Jiang Hi Tech Park 65843 Sulzbach, Germany
Product Information Service Shanghai 201203 PRC Product Information Service
t: +1-800-833-4882 Customer Service t: +49-800-86427-531
t: +1-859-372-3244 t: +86 21 3861 9266 t: +49-(0)-69-45009-1011
Customer Service f: +86 21 3861 9599 e: info-engineeredmaterials-eu@celanese.com
t: +1-800-526-4960 e: info-engineeredmaterials-asia@celanese.com
t: +1-859-372-3214
e: info-engineeredmaterials-am@celanese.com

General Disclaimer

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CELCON® M90™ - POM

NOTICE TO USERS: Values shown are based on testing of laboratory test specimens and represent data that fall within the standard range of
properties for natural material. These values alone do not represent a sufficient basis for any part design and are not intended for use in
establishing maximum, minimum, or ranges of values for specification purposes. Colorants or other additives may cause significant variations in
data values. Properties of molded parts can be influenced by a wide variety of factors including, but not limited to, material selection, additives, part
design, processing conditions and environmental exposure. Any determination of the suitability of a particular material and part design for any use
contemplated by the users and the manner of such use is the sole responsibility of the users, who must assure themselves that the material as
subsequently processed meets the needs of their particular product or use. To the best of our knowledge, the information contained in this
publication is accurate; however, we do not assume any liability whatsoever for the accuracy and completeness of such information. The
information contained in this publication should not be construed as a promise or guarantee of specific properties of our products. It is the sole
responsibility of the users to investigate whether any existing patents are infringed by the use of the materials mentioned in this publication.
Moreover, there is a need to reduce human exposure to many materials to the lowest practical limits in view of possible adverse effects. To the
extent that any hazards may have been mentioned in this publication, we neither suggest nor guarantee that such hazards are the only ones that
exist. We recommend that persons intending to rely on any recommendation or to use any equipment, processing technique or material mentioned
in this publication should satisfy themselves that they can meet all applicable safety and health standards. We strongly recommend that users seek
and adhere to the manufacturer’s current instructions for handling each material they use, and entrust the handling of such material to adequately
trained personnel only. Please call the telephone numbers listed for additional technical information. Call Customer Services for the appropriate
Materials Safety Data Sheets (MSDS) before attempting to process our products. The products mentioned herein are not intended for use in
medical or dental implants.

Trademark
© 2014 Celanese or its affiliates. All rights reserved. (Published 27.July.2016). Celanese®, registered C-ball design and all other trademarks
identified herein with ®, TM, SM, unless otherwise noted, are trademarks of Celanese or its affiliates. Fortron is a registered trademark of Fortron
Industries LLC.

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