POM Polyplastics DURACON M270‑44

POM Polyplastics DURACON® M270‑44 (Japan Polyplastics)

POM Polyplastics M270‑44 is a high‑flow engineering plastic with stable dimensional performance, good wear resistance and excellent mechanical properties. It is especially suitable for production scenarios requiring fast molding cycles and good filling performance, such as thin‑wall products with complex structures.

Main Applications

Automotive industry: fuel‑tank caps, fuel‑pump components, seat‑belt parts, interior functional components and other automotive parts. Electrical & electronic: structural parts and transmission components for OA equipment such as printers and copiers; parts for DVD/Blu‑ray players; gears and bearings for household appliances such as washing‑machines, refrigerators and electric shavers. Consumer & industrial goods: residential‑sector articles including zippers, buttons, window‑frame and shutter components; toys and sports‑equipment parts. Precision‑machinery parts: ideal for manufacturing various mechanical structural components with high‑precision, high‑wear‑resistance and low‑friction requirements, such as gears, screws, bearings, cams and guide rails.

Physical‑Mechanical‑Thermal‑Electrical‑Tribological Properties

Property Category	Item	Test Standard	Value	Unit
Physical Properties	Density	ISO 1183	1.41	g/cm³
	Water absorption (23℃, 24h)	ISO 62	0.5	%
	MFR (190℃ / 2.16 kg)	ISO 1133	27	g/10 min
	MVR (190℃ / 2.16 kg)	ISO 1133	23	cm³/10 min
Mechanical Properties	Tensile strength	ISO 527‑1,2	63	MPa
	Elongation at break	ISO 527‑1,2	30	%
	Tensile modulus	ISO 527‑1,2	2800	MPa
	Flexural strength	ISO 178	88	MPa
	Flexural modulus	ISO 178	2550	MPa
	Charpy notched impact strength (23℃)	ISO 179/1eA	5.3	kJ/m²
	Rockwell hardness (M scale)	ISO 2039‑2	80	—
Thermal Properties	Heat deflection temperature (1.8 MPa)	ISO 75‑1,2	100	°C
	Coefficient of linear thermal expansion (flow / cross‑flow, 23‑55°C)	ISO 11359‑2	11	×10⁻⁵/°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	UL 94	HB	—
	Molding shrinkage (flow / cross‑flow direction)	ISO 294‑4	1.9	%

Processing Parameters

Process Stage	Parameter	Recommended Value / Range	Unit	Remarks
Pre‑drying	Drying temperature	80‑90	°C	Drying is recommended. Preheating improves dimensional stability even though drying may be omitted in some cases.
	Drying time	3‑4	hr
	Residual moisture content	< 0.1	%
Barrel temperature	Rear‑zone temperature	180‑200	°C	POM has a narrow processing window. Temperatures above 220 °C are strictly prohibited; otherwise formaldehyde gas will be generated through thermal decomposition.
	Middle‑zone temperature	180‑195	°C
	Front‑zone temperature	185‑210	°C
	Nozzle temperature	180‑210	°C	Slightly lower than front‑zone temperature.
	Melt temperature	190‑210	°C
	Mold temperature	60‑80 (can be increased up to 75‑120)	°C	Higher mold‑temperature promotes crystallization integrity and improves dimensional stability and surface gloss.
Injection parameters	Injection pressure	49‑98 (or 40‑130)	MPa	Higher value for thin‑wall parts; lower value for thick‑wall parts.
	Hold‑up pressure	50‑150	MPa	Relatively high hold‑up pressure (comparable to injection pressure) is required to reduce pressure drop.
	Back pressure	0.5‑3.0	MPa	Maintain low back‑pressure.
	Injection speed	Medium‑to‑high	—	Medium speed is recommended.
	Screw speed	100‑150	rpm	Excessively high rotational speed is not advised.
Post‑treatment	—	—	—	Generally unnecessary. Conditioning or annealing treatment can be applied for high‑precision parts to release internal‑stress.
	Barrel residence time	＜20	min	Avoid long‑term high‑temperature retention.
Shutdown procedure	Short‑term stop	Cool barrel below 150	°C	Long‑term shutdown purge barrel with PE / PP.

Note: All data for reference only, subject to official TDS and COA.