GEHR Plastics POM-C Acetal

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GEHR Plastics POM-C Acetal
Categories:	Polymer; Thermoplastic; Acetal (Polyoxymethylene, POM)
Material Notes:	Polyoxymethylene can be used in temperatures up to 100°C. The high surface strength is only surpassed by a few materials. POM shows good sliding properties and high resistance to wear and tear because of the high strength and smooth surface. There is a very low risk of stress cracks. POM-C exhibits a high thermal stability and a high resistance to chemicals. Properties: no microporosity high strength high rigidity high thermal stability low water absorption high dimension stability good electrical insulating properties very good sliding properties high resistance to stress cracks not resistant to high concentrated acids difficult to glue and paint Applications include bearings, fittings, gear wheels, parts for pumps, screws, bobbins, parts for textile industry, and medium for coating lines.
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Physical Properties	Original Value	Comments

Specific Gravity	1.39 g/cc	ISO 1183
Moisture Absorption at Equilibrium	0.20 %	ISO 62
Water Absorption at Saturation	0.80 %	ISO 62

Mechanical Properties	Original Value	Comments
Hardness, Shore D	83	ISO 868
Ball Indentation Hardness	165 MPa	ISO 2039
Tensile Strength at Break	65.0 MPa	ISO 527
Tensile Strength, Yield	67.0 MPa	ISO 527
Elongation at Break	28 %	ISO 527
Elongation at Yield	22 %	ISO 527
Modulus of Elasticity	2.855 GPa	ISO 527
Charpy Impact Unnotched	NB	ISO 179
Charpy Impact, Notched	6.00 kJ/m²	ISO 179

Electrical Properties	Original Value	Comments
Volume Resistivity	3.00e+13 ohm-cm	IEC 60093
Surface Resistance	>= 1.00e+13 ohm	IEC 60093
Dielectric Constant	3.8 @Frequency 1e+6 Hz	IEC 60250
Dielectric Strength	40.0 kV/mm	IEC 60243-1
Dielectric Loss Index	0.0050 @Frequency 1e+6 Hz	IEC 60250
Comparative Tracking Index	600 V	IEC 60112

Thermal Properties	Original Value	Comments
CTE, linear	120 µm/m-°C	ISO 11359
Melting Point	166 °C	DIN EN ISO 3146
Maximum Service Temperature, Air	100 °C	UL 746B
Deflection Temperature at 0.46 MPa (66 psi)	155 °C	ISO 75
Deflection Temperature at 1.8 MPa (264 psi)	95.0 °C	ISO 75
Vicat Softening Point	150 °C	VST/B/50; ISO 306
Minimum Service Temperature, Air	-40.0 °C	UL 746B
Glass Transition Temp, Tg	-65.0 °C	DIN EN ISO 3146
Flammability, UL94	HB	UL 94
Oxygen Index	18 %	ASTM D2863

Compliance Properties	Original Value	Comments
FDA	Yes	Physiological indifference

Descriptive Properties
Acid Resistance	no
Aromatic Resistance	yes
Bondability	no
CKW Resistance	limited
Color	natural
Hydrocarbonate Resistance	yes
Hydroxide Resistance	yes
Ketone Resistance	yes
Physiological indifference	yes, EEC
Resistance Against Hot Water	yes
UV Stabilization	no

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PGEHR024 / 79861

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