POM Polyplastics DURACON M90‑88

POM Polyplastics DURACON® M90‑88 (Japan Polyplastics)

POM Polyplastics M90‑88 is a low‑temperature‑grade polyoxymethylene copolymer material. It is especially suitable for outdoor or low‑temperature‑environment applications requiring good wear resistance, high rigidity, stable dimensional performance and chemical resistance.

Main Applications

Automotive industry: automotive components that may be exposed to low‑temperature conditions for long‑term service, such as exterior decorative parts, door handles, rear‑view‑mirror housings and fuel‑system components. Electrical & electronic: climate‑resistant electrical‑electronic components including outdoor equipment housings and junction‑box & sensor housings; movement gears, structural parts and transmission components for OA equipment such as printers and copiers; gears and bearings for household appliances such as washing‑machines and refrigerators. Consumer & industrial goods: residential‑sector articles including gardening‑equipment components, outdoor‑sports‑equipment parts, door‑window hardware, window‑frame and shutter components. These applications benefit directly from its low‑temperature resistance. Precision‑machinery parts: manufacture of various mechanical structural components with high‑precision, high‑wear‑resistance and low‑friction requirements, especially those operated under outdoor or low‑temperature conditions.

Physical‑Mechanical‑Thermal‑Electrical Properties

Property Category	Item	Test Standard	Value	Unit
Physical Properties	Density	ISO 1183	1.41	g/cm³
	MFR (190℃ / 2.16 kg)	ISO 1133	To be confirmed	g/10 min
Mechanical Properties	Tensile strength	ISO 527‑1,2	63	MPa
	Elongation at break	ISO 527‑1,2	31	%
	Flexural modulus	ISO 178	2400	MPa
	Flexural strength	ISO 178	86	MPa
	Charpy notched impact strength (23℃)	ISO 179/1eA	7	kJ/m²
Thermal Properties	Heat deflection temperature (1.8 MPa)	ISO 75‑1,2	93	°C
	Coefficient of linear thermal expansion (flow direction, 23‑55°C)	—	12×10⁻⁵	/℃
	Coefficient of linear thermal expansion (cross‑flow direction, 23‑55°C)	—	12×10⁻⁵	/℃
Electrical Properties	Dielectric strength (3 mm)	IEC 60243‑1	19	kV/mm
Flammability	UL94 rating	UL 94	HB	—

Injection‑Molding Parameters

Process Stage	Parameter	Recommended Range	Unit	Remarks
Pre‑drying	Drying temperature	80‑100	°C	Although POM has low moisture absorption, drying is recommended for improved dimensional stability and surface appearance.
	Drying time	2‑4	hr
	Residual moisture content	< 0.2	%
Barrel temperature	Rear‑zone temperature	150‑170	°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	170‑190	°C
	Front‑zone temperature	180‑200	°C
	Nozzle temperature	170‑190	°C	Slightly lower than or close to front‑zone temperature.
	Melt temperature	190‑210	°C
	Mold temperature	40‑80 (can be increased up to 80‑105)	°C	Higher mold‑temperature promotes crystallization integrity, improves dimensional stability, surface gloss and reduces sink‑marks.
Injection parameters	Injection pressure	80‑150	MPa	Higher value (120‑150 MPa) for thin‑wall parts; lower value (80‑120 MPa) for thick‑wall parts.
	Hold‑up pressure	50%‑70% of injection pressure	MPa	Relatively high hold‑up pressure is required to reduce pressure drop and prevent part shrinkage; hold‑up time generally ranges from 5‑15 s.
	Back pressure	0.5‑2.0	MPa	Maintain low back‑pressure; excessive back‑pressure causes melt overheating and degradation.
	Injection speed	30‑80	mm/s	Medium‑to‑high speed is recommended; multi‑stage speed profile is available.
	Screw speed	30‑80	rpm	Avoid excessive screw speed; keep cushion residual minimal, as high rotational speed generates shear heat leading to material degradation.
	Cooling time	10‑30	s	Depends on part thickness, to ensure no deformation upon ejection.
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.