POM Polyplastics DURACON M90‑04

POM Polyplastics DURACON® M90‑04 (Japan Polyplastics)

POM Polyplastics M90‑04 is a versatile general‑purpose engineering plastic with excellent overall performance and wide‑ranging applications. It delivers outstanding mechanical properties and is especially suitable for applications requiring good wear resistance, high rigidity, stable dimensional performance and chemical resistance.

Main Applications

Automotive industry: fuel‑pump components, seat‑belt parts, interior functional components, pipeline valves and other automotive parts. Electrical & electronic: 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. Precision‑machinery parts: ideal for manufacturing various mechanical structural components with high‑precision, high‑wear‑resistance and low‑friction requirements, such as gears, bearings, cams and screws. Consumer & industrial goods: zippers, buttons, window‑frame and shutter components, water taps and similar articles. Other fields: also applied to toys, sports‑equipment components and sanitary‑ware products.

Physical‑Mechanical‑Thermal‑Electrical‑Tribological Properties

Property Category	Item	Test Standard	Value	Unit
Physical Properties	Density	ASTM D‑792	1.41	g/cm³
	Water absorption (23℃, 24h)	ASTM D‑570	0.22	%
	Dynamic friction coefficient (against steel)	ASTM D‑1894	0.15	—
	Dynamic friction coefficient (against DURACON POM)	ASTM D‑1894	0.35	—
Mechanical Properties	Tensile strength	ASTM D‑638	60	MPa
	Elongation at break	ASTM D‑638	60	%
	Flexural strength	ASTM D‑790	96	MPa
	Flexural modulus	ASTM D‑790	2580	MPa
	Izod notched impact strength (notched‑side)	ASTM D‑256	63	J/m
	Izod notched impact strength (back‑side of notch)	ASTM D‑256	760	J/m
	Rockwell hardness (M scale)	ASTM D‑785	80	—
Thermal Properties	Heat deflection temperature (1.32 MPa)	ASTM D‑648	110	°C
	Coefficient of linear thermal expansion	ASTM D‑596	10	×10⁻⁵/°C
Electrical Properties	Volume resistivity	ASTM D‑257	1 × 10¹⁴	Ω·cm
	Surface resistivity	ASTM D‑257	1 × 10¹⁶	Ω
	Dielectric strength	ASTM D‑149	24	MV/m
Flammability	UL94 rating	UL 94	HB	—

Injection‑Molding Parameters

Process Stage	Parameter	Recommended Range	Unit	Remarks
Pre‑drying	Drying temperature	80‑90	°C	Drying is recommended. Despite low moisture absorption, drying improves dimensional stability and surface appearance.
	Drying time	2‑4	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	80‑100	°C	Higher mold‑temperature promotes crystallization integrity, improves dimensional stability, surface gloss and reduces sink‑marks.
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	Comparable to or slightly lower than injection pressure (50‑150)	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	Medium	—	Recommended strategy: medium pressure, medium speed.
	Screw speed	100‑150	rpm	Avoid excessive screw speed.
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.