POM-H (Polyoxymethylene, Acetal homopolymer, Delrin) Material Data Sheet

POM-H Polyoxymethylene Delrin Acetal CNC Machining Service Company in Turkey-Modulus Metal

Designation

Polyoxymethylene, acetal (homopolymer)

Tradenames

Accucomp, Altech, Ashlene, Astatal, Bergaform, Bestpom, Celcon, Cheng, Cress-Atal, Delrin, Duracon, Duratuf, Edgetek, Hostaform, Hostaform Xap², Isoform, Iupital, Kebaform, Kepital, Kocetal, Latan, Lucel, Next Regrind, Pier, Poliform, Polyform, Ramtal, Schulaform, Sindustris, Stat-Loy, Tarnoform, Tenac, Tenac-C, Tepcon, Terez, Tynea, Tystron, Ultraform

Typical uses

Bearings, gears, snap-fit components, cams, plumbing components, carburetor bodies.

Compositional summary
Homopolymer of (CH2-O)n (from formaldehyde or trioxane)
Material family	Plastic (thermoplastic, semi- crystalline)
Base material	POM (Polyoxymethylene / acetal
Polymer code	POM

Composition detail
Polymer	100 %

Physical properties
Density	1410-1430 kg/m^3

Mechanical properties
Young’s modulus	2.76	–	3.59	GPa
Specific stiffness	1.94	–	2.53	MN.m/kg
Yield strength (elastic limit)	65.5	–	69	MPa
Tensile strength	66.9	–	69	MPa
Specific strength	46.1	–	48.6	kN.m/kg
Elongation	10	–	75	% strain
Compressive modulus	4.49	–	4.72	GPa
Compressive strength	108	–	124	MPa
Flexural modulus	2.61	–	3.37	GPa
Flexural strength (modulus of rupture)	93.8	–	110	MPa
Shear modulus	1.03	–	1.34	GPa
Bulk modulus	3.2	–	3.36	GPa
Poisson’s ratio	0.33	–	0.35
Shape factor	5.1
Hardness – Vickers	20	–	25	HV
Hardness – Rockwell M	92	–	94
Hardness – Rockwell R	114	–	126
Elastic stored energy (springs)	624	–	826	kJ/m^3
Fatigue strength at 10^7 cycles	23.8	–	31	MPa

Impact & fracture properties
Fracture toughness	3.8	–	4.2	MPa.m^0.5
Toughness (G)	4.32	–	5.95	kJ/m^2
Impact strength, notched 23 °C	7.24	–	12.4	kJ/m^2
Impact strength, notched -30 °C	6.8	–	9.91	kJ/m^2
Impact strength, unnotched 23 °C	590	–	600	kJ/m^2
Impact strength, unnotched -30 °C	590	–	600	kJ/m^2

Thermal properties
Melting point	172	–	184	°C
Glass temperature	-60	–	-50	°C
Heat deflection temperature 0.45MPa	162	–	172	°C
Heat deflection temperature 1.8MPa	123	–	136	°C
Maximum service temperature	77	–	97	°C
Minimum service temperature	-50	–	-40	°C
Thermal conductivity	0.221	–	0.239	W/m.°C
Specific heat capacity	1270	–	1300	J/kg.°C
Thermal expansion coefficient	90	–	202	µstrain/°C
Thermal shock resistance	105	–	240	°C
Thermal distortion resistance	0.00114	–	0.00256	MW/m

Electrical properties
Electrical resistivity	3.3e20	–	3e21	µohm.cm
Electrical conductivity	5.75e-20	–	5.22e-19	%IACS
Dielectric constant (relative permittivity)	3.6	–	3.8
Dissipation factor (dielectric loss tangent)	0.0046	–	0.005
Dielectric strength (dielectric breakdown)	15.7	–	19.7	MV/m
Comparative tracking index	300	–	600	V

Processing properties

Polymer injection molding	Acceptable
Polymer extrusion	Acceptable
Polymer thermoforming	Unsuitable

Linear mold shrinkage	1.8	–	2.5	%
Melt temperature	193	–	243	°C
Mold temperature	80	–	100	°C
Molding pressure range	68.8	–	138	MPa

Durability
Water (fresh)	Excellent
Water (salt)	Excellent
Weak acids	Acceptable
Strong acids	Unacceptable
Weak alkalis	Excellent
Strong alkalis	Excellent
Organic solvents	Acceptable
Oxidation at 500C	Unacceptable
UV radiation (sunlight)	Poor
Flammability	Highly flammable

Processing energy, CO2 footprint & water
Polymer extrusion energy	5.76	–	6.36	MJ/kg
Polymer extrusion CO2	0.432	–	0.477	kg/kg
Polymer extrusion water	4.8	–	7.2	l/kg
Polymer molding energy	16.9	–	18.7	MJ/kg
Polymer molding CO2	1.27	–	1.4	kg/kg
Polymer molding water	11.8	–	17.8	l/kg
Coarse machining energy (per unit wt removed)	1.25	–	1.38	MJ/kg
Coarse machining CO2 (per unit wt removed)	0.0937	–	0.104	kg/kg
Fine machining energy (per unit wt removed)	8.22	–	9.08	MJ/kg
Fine machining CO2 (per unit wt removed)	0.616	–	0.681	kg/kg
Grinding energy (per unit wt removed)	16	–	17.6	MJ/kg
Grinding CO2 (per unit wt removed)	1.2	–	1.32	kg/kg