POM Polyplastics DURACON M25

POM Polyplastics DURACON® M25 (Japan Polyplastics)

POM Polyplastics M25 is a high‑viscosity extrusion‑grade polyoxymethylene copolymer material, renowned for outstanding mechanical strength, chemical stability, wear resistance and dimensional stability.

Main Applications

Extruded profiles: mainly used for manufacturing tubes and other extruded profiles. Automotive industry: also applied to auto parts such as gears, bearings, fuel‑tank caps, fuel pumps and seat‑belt components. Home appliances: components for household appliances including washing‑machines, refrigerators and electric shavers. Office equipment: mechanism gears for office equipment such as printers and copiers. Other applications: AV equipment (e.g. DVD players), residential‑sector articles such as window‑frame and shutter components.

Physical‑Mechanical‑Thermal‑Electrical‑Tribological Properties

Property Category	Item	Test Standard	Test Data	Unit
Physical Properties	Density	ISO 1183	1.41	g/cm³
	Water absorption (24 h)	ISO 62	0.50	%
	MFR (190 °C / 2.16 kg)	ISO 1133	2.5 (MVR: 2.20)	g/10min (cm³/10min)
	Molding shrinkage	—	—	%
Mechanical Properties	Tensile strength	ISO 527‑1,2	59	MPa
	Elongation at break	ISO 527‑1,2	40	%
	Tensile modulus	ISO 527‑1,2	2500	MPa
	Flexural strength	ISO 178	81	MPa
	Flexural modulus	ISO 178	2350	MPa
	Charpy notched impact strength (23 °C)	ISO 179/1eA	8.0	kJ/m²
	Rockwell hardness (M Scale)	ISO 2039‑2	80	—
	Dynamic friction coefficient (against POM)	JIS K7218	0.37‑0.40	—
Thermal Properties	HDT (1.8 MPa)	ISO 75‑1,2	90.0	°C
	Coefficient of linear thermal expansion (flow, 23‑55 °C)	ISO 11359‑2	1.2E‑4 or 13×10⁻⁵	cm/cm/°C
	Coefficient of linear thermal expansion (transverse, 23‑55 °C)	ISO 11359‑2	1.2E‑4 or 12×10⁻⁵	cm/cm/°C
Electrical Properties	Volume resistivity	IEC 60093	1×10¹⁴	Ω·cm
	Surface resistivity	IEC 60093	1×10¹⁶	Ω
	Dielectric strength (3 mm)	IEC 60243‑1	19	kV/mm
Flammability	UL94 rating (1.5 mm)	UL 94	HB	—

Extrusion Process Parameters

Parameter	Typical Value / Range	Remarks & Instructions
Drying Treatment		Drying is not mandatory before processing. Preheating (approx. 80 °C) during processing improves dimensional stability.
Preheating temperature	~80 °C	Preheating benefits dimensional stability of finished products.
Processing Temperature		POM has a narrow processing temperature window (up to 215 °C). Temperature shall never exceed 220 °C; otherwise irritating formaldehyde gas will be generated by decomposition. Avoid long material residence time inside barrel.
Barrel rear zone (feed zone)	150‑180 °C	Near feed throat; high temperature shall be avoided.
Barrel middle zone (compression zone)	170‑190 °C	Main plasticizing zone.
Barrel front zone (metering zone)	180‑200 °C	Close to die side.
Melt temperature	~180‑205 °C	Must not exceed 220 °C. Avoid high temperature and long residence time to prevent POM degradation (decomposition temperature approx. 220‑240 °C).
Die temperature	80‑100 °C	Higher die temperature improves dimensional stability and surface gloss; take anti‑burn precautions for hot extrudates.
Screw speed	Adjust according to extruder and die	Excessively high speed generates excessive shear heat and triggers POM degradation.
Extrusion pressure	Adjust according to die and product	Ensure uniform melt extrusion and good forming performance.

Injection‑Molding Process Parameters

Parameter	Reference Value / Range	Remarks & Instructions
Injection pressure	40‑130 MPa	Adjust according to wall thickness and fluidity; higher pressure for thin‑wall parts, lower for thick‑wall parts.
Hold‑up pressure	Comparable to injection pressure	Relatively high hold‑up pressure is required to reduce pressure drop.
Hold‑up time	Adjust according to part wall thickness
Injection speed	Medium speed	Too fast causes turbulence and burning; too slow leads to short shots and obvious weld lines.

Note: All data above is for reference only.