Acetron® C Sterra™ POM-C

Identification & Functionality

Polymer Name

Polyacetal Copolymer (POM)

Plastics & Elastomers Functions

Resin

Technologies

Plastics

Product Families

Plastics — Engineering & Specialty Polymers

Polyacetals

Plastics — Parts, Shapes & Films

Features & Benefits

Labeling Claims

Low Carbon Footprint (PCF),

Recycled

Materials Features

Good Machinability,

Highly Versatile,

Low Moisture Absorption,

Non-porous

Applications & Uses

Markets

Industrial

Applications

Industrial — Chemical & Industrial Manufacturing

Equipment & Parts

Industrial — Other Industrial Applications

Plastics & Elastomers End Uses

General Purpose

Properties

Color

Black

Flame Rating

UL 94 HB

Physical Form

Bars,

Rods

Mechanical Properties

	Value	Units	Test Method / Conditions
Tensile Strength ⁷ ⁶	66	MPa	ISO 527-1/-2
Tensile Strain (Elongation, at Yield) ⁷ ⁶	15	%	ISO 527-1/-2
Tensile Strain (Elongation, at Break) ⁷ ⁶	40	%	ISO 527-1/-2
Tensile Modulus of Elasticity ⁹ ⁶	3000	MPa	ISO 527-1/-2
Shear Strength ⁶	8000	PSI	ASTM D732
Shear Strength ⁶	55	—	—
Compressive Stress (at 1% Nominal Strain) ¹⁰ ⁶	23	MPa	ISO 604
Compressive Stress (at 2% Nominal Strain) ¹⁰ ⁶	40	MPa	ISO 604
Compressive Stress (at 5% Nominal Strain) ¹⁰ ⁶	72	MPa	ISO 604
Unnotched Charpy Impact Strength ⁶	No break	kJ/m²	ISO 179-1/1eU
Notched Charpy Impact Strength ⁶	8	kJ/m²	ISO 179-1/1eA
Flexural Strength ¹² ⁶	91	MPa	ISO 178
Hardness, Rockwell Scale M ¹⁴ ⁶	88	—	ASTM D785
Hardness, Rockwell Scale M ¹⁴ ⁶	84	ISO 2039-2	ISO 2039-2
Hardness, Shore D ¹⁴ ⁶	85	—	ASTM D2240
Hardness, Shore D ¹⁴ ⁶	79	ISO 868	ISO 2039-2
Tensile Strength ⁶ ⁸	9500	PSI	ASTM D638
Tensile Strain (Elongation, at Yield) ⁶ ⁸	11	%	ASTM D638
Tensile Strain (Elongation, at Break) ⁶ ⁸	40	%	ASTM D638
Tensile Modulus of Elasticity ⁶ ⁸	400	PSI	ASTM D638
Compressive Strength ⁶ ¹¹	13500	PSI	ASTM D695
Notched Izod Impact Strength ⁶	1	ft.lb./in	ASTM D256
Flexural Strength ¹³ ⁶	12000	PSI	ASTM D790
Flexural Modulus of Elasticity ⁶	400	PSI	ASTM D790

Thermal Properties

	Value	Units	Test Method / Conditions
Melting Temperature (at 10°C/min) ¹	165	°C	ISO 11357-1/-3 (Differential Scanning Calorimetry)
Thermal Conductivity (at 23°C) ¹	0.31	W/(K.m)	—
Coefficient of Linear Thermal Expansion (at 23°C - 60°C) ¹	110	μm/(m.K)	—
Coefficient of Linear Thermal Expansion (at 23°C - 100°C) ¹	125	μm/(m.K)	—
Heat Deflection Temperature (Method A, 1.8 MPa) ¹	100	°C	ISO 75-1/-2
Continuous Allowable Service Temperature in Air (20 hrs) ³ ¹	180	°F	—
Continuous Allowable Service Temperature in Air (20 hrs) ³ ¹	100	°C	—
Service Temperature ⁴ ¹	min. -50	°C	—
Flammability (at 3 mm) ⁵ ¹	HB	—	UL 94
Flammability (Oxygen Index) ¹	15	%	ISO 4589-1/-2
Melting Temperature (at 50°F/min) ¹	335	°F	ASTM D3418 (Differential Scanning Calorimetry)
Thermal Conductivity (at 73°F) ¹	1.6	BTU in./(hr.ft².°F)	—
Coefficient of Linear Thermal Expansion (at -40°F - 300°F) ¹	54	μin./in./°F	ASTM E-831 (TMA)
Heat Deflection Temperature (Method A, 264 PSI) ¹	220	°F	ASTM D648
Flammability (at 1/8 in) ⁵ ¹	HB	—	UL 94

Electrical Properties

	Value	Units	Test Method / Conditions
Electric Strength ¹⁵	20	kV/mm	IEC 60243-1
Volume Resistivity	1E+14	Ohm.cm	IEC 62631-3-1
Surface Resistivity	1E+13	Ohm/sq.	ANSI/ESD STM 11.11
Dielectric Constant (at 1 MHz)	3.8	—	IEC 62631-2-1
Dielectric Constant (at 1 MHz)	3.8	—	ASTM D150
Dissipation Factor (at 1MHz)	0.008	—	IEC 62631-2-1
Dissipation Factor (at 1MHz)	0.005	—	ASTM D150
Electric Strength	420	Volts/mil	ASTM D149

Miscellaneous Properties

	Value	Units	Test Method / Conditions
Density	1.41	g/cm³	ISO 1183-1
Water Absorption (After 24h Immersion in Water of 23°C) ¹⁶	0.24	%	ISO 62
Water Absorption (at Saturation in Water of 23°C)	0.8	%	—
Wear Rate ¹⁸	45	μm/km	ISO 7148-2
Dynamic Coefficient of Friction ¹⁸	0.3 - 0.45	—	ISO 7148-2
Limiting PV (at 0.1 / 1 m/s Cylindrical Sleeve Bearings)	0.16	Mpa.m/s	—
Specific Gravity	1.41	—	ASTM D792
Water Absorption (After 24h Immersion in Water of 73°F) ¹⁷	0.2	%	ASTM D570
Water Absorption (at Saturation in Water of 73°F) ¹⁷	0.9	%	ASTM D570
Wear Rate ¹⁹	200	in³.min/ft.lbs.hrX10⁻¹⁰	QTM 55010
Dynamic Coefficient of Friction ²⁰	0.25	—	QTM 55007
Limiting PV (at 100 FPM) ²¹	2700	ft.lbs/in².min	QTM 55007

Note

• Note: 1 g/cm³ = 1,000 kg/m³ ; 1 MPa = 1 N/mm² ; 1 kV/mm = 1 MV/m
• This table, mainly to be used for comparison purposes, is a valuable help in the choice of material. The data listed here fall within the normal range of product properties of dry material. However, they are not guaranteed and should not be used to establish material specification limits or alone as the basis of design. See the remaining notes on the next page.
• ¹ The figures given for these properties are for the most part derived from raw material supplier data and other publications.
• ² Values for this property are only given here for amorphous materials and for materials that do not show a melting temperature (PBI & PI).
• ³ Temperature resistance over a period of min. 20,000 hours. After this period of time, there is a decrease in tensile strength – measured at 23 °C – of about 50 % as compared with the original value. The temperature value given here is thus based on the thermal-oxidative degradation which takes place and causes a reduction in properties. Note, however, that the maximum allowable service temperature depends in many cases essentially on the duration and the magnitude of the mechanical stresses to which the material is subjected.
• ⁴ Impact strength decreases with decreasing temperature, the minimum allowable service temperature is practically mainly determined by the extent to which the material is subjected to impact. The value given here is based on unfavorable impact conditions and may consequently not be considered as being the absolute practical limit.
• ⁵ These estimated ratings, derived from raw material supplier data and other publications, are not intended to reflect hazards presented by the material under actual fire conditions. There is no ‘UL File Number’ available for these stock shapes.
• ⁶ Most of the figures given for the mechanical properties are average values of tests run on dry test specimens machined out of rods 40-60 mm when available, else out of plate 10-20mm. All tests are done at room temperature (23° / 73°F)
• ⁷ Test speed: either 5 mm/min or 50 mm/min [chosen acc. to ISO 10350-1 as a function of the ductile behavior of the material (tough or brittle)] using type 1B tensile bars
• ⁸ Test speed: either 0.2"/min or 2"/min or [chosen as a function of the ductile behavior of the material (brittle or tough)] using Type 1 tensile bars
• ⁹ Test speed: 1 mm/min, using type 1B tensile bars
• ¹⁰ Test specimens: cylinders Ø 8 mm x 16 mm, test speed 1 mm/min
• ¹¹ Test specimens: cylinders Ø 0.5" x 1", or square 0.5" x 1", test speed 0.05"/min
• ¹² Test specimens: bars 4 mm (thickness) x 10 mm x 80 mm ; test speed: 2 mm/min ; span: 64 mm
• ¹³ Test specimens: bars 0.25" (thickness) x 0.5" x 5" ; test speed: 0.11"/min ; span: 4"
• ¹⁴ Measured on 10 mm, 0.4" thick test specimens
• ¹⁵ Electrode configuration Φ 25 / Φ 75 mm coaxial cylinders in transformer oil according to IEC 60296 ; 1 mm thick test specimens
• ¹⁶ Measured on disks Ø 50 mm x 3 mm
• ¹⁷ Measured on 1/8" thick x 2" diameter or square
• ¹⁸ Test procedure similar to Test Method A: “Pin-on-disk” as described in ISO 7148-2, Load 3MPa, sliding velocity= 0,33 m/s, mating plate steel Ra= 0.7-0.9 μm, tested at 23°C, 50%RH
• ¹⁹ Test using journal bearing system, 200 hrs, 118 ft/min, 42 PSI, steel shaft roughness 16±2 RMS micro inches with Hardness Brinell of 180-200
• ²⁰ Test using Plastic Thrust Washer rotating against steel, 20 ft/min and 250 PSI, Stationary steel washer roughness 16±2 RMS micro inches with Rockwell C 20-24
• ²¹ Test using Plastic Thrust Washer rotating against steel, Step by step increase pressure, the test ends when plastic begins to deform or if temperature increases to 300°F

Regulatory & Compliance

Certifications & Compliance

UL 94