POM Polyplastics DURACON M90‑45

POM Polyplastics DURACON® M90‑45 (Japan Polyplastics)

POM Polyplastics M90‑45 is a weather‑resistant grade polyoxymethylene copolymer material. It is especially suitable for outdoor or light‑exposed‑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 sunlight 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, junction boxes and 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 weather 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 conditions.

Physical‑Mechanical‑Thermal‑Electrical Properties

Property Category	Item	Test Standard	Value	Unit
Physical Properties	Density	ISO 1183	1.41	g/cm³
	Water absorption (23℃, 24h)	ISO 62	0.60	%
	MFR (190℃ / 2.16 kg)	ISO 1133	9.0	g/10 min
	MVR (190℃ / 2.16 kg)	ISO 1133	8.00	cm³/10 min
Mechanical Properties	Tensile strength	ISO 527‑2	62.0	MPa
	Elongation at break	ISO 527‑2	35	%
	Tensile modulus	ISO 527‑2	2700	MPa
	Flexural strength	ISO 178	87.0	MPa
	Flexural modulus	ISO 178	2500	MPa
	Charpy notched impact strength (23℃)	ISO 179/1eA	6.0	kJ/m²
	Rockwell hardness (M scale)	ISO 2039‑2	80	—
Thermal Properties	Heat deflection temperature (1.8 MPa, unannealed)	ISO 75‑2/A	95.0	°C
	Coefficient of linear thermal expansion (flow direction, 23‑55°C)	Internal method	1.2E‑4	cm/cm/°C
	Coefficient of linear thermal expansion (transverse direction, 23‑55°C)	Internal method	1.2E‑4	cm/cm/°C
Electrical Properties	Volume resistivity	IEC 60093	4 × 10¹⁴	Ω·cm
	Surface resistivity	IEC 60093	4 × 10¹⁵	Ω
	Dielectric strength (3.00 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	80‑90	°C	Although POM has low moisture absorption, drying is recommended for improved dimensional stability and surface appearance, especially for weather‑resistant grades.
	Drying time	3.0‑4.0	hr
	Residual moisture content	< 0.1‑0.2	%
Barrel temperature	Rear‑zone temperature	170‑190	°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	180‑200	°C
	Front‑zone temperature	185‑210	°C
	Nozzle temperature	180‑210	°C	Slightly lower than or close to front‑zone temperature.
	Melt temperature	190‑210	°C
	Mold temperature	60.0‑80.0	°C	Higher mold‑temperature promotes crystallization integrity, improves dimensional stability, surface gloss and reduces sink‑marks.
Injection parameters	Injection pressure	49.0‑98.0	MPa	Higher value for thin‑wall parts; lower value for thick‑wall parts.
	Hold‑up pressure	Comparable to or slightly lower than injection pressure	MPa	Relatively high hold‑up pressure is required to reduce pressure drop and prevent part shrinkage.
	Back pressure	0.5‑3.0	MPa	Maintain low back‑pressure.
	Injection speed	5‑50	mm/s	Recommended strategy: medium pressure, medium speed, moderate‑low melt‑temperature and relatively high mold‑temperature.
	Screw speed	100‑150	rpm	Avoid excessive screw speed; keep cushion residual minimal.
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.