POM Xinjiang Xinlianxin X90

POM Xinjiang Xinlianxin X90 is a polyacetal resin with good dimensional‑stability, wear‑resistance and self‑lubricity. Special additives optimize flow‑ability and toughness; balanced mechanical, thermal and chemical‑stability performance.

Main Applications

Automotive: gears, bearings, fuel‑system components, seat‑belt parts, interior functional components. Electrical & electronic: gears, bearings, structural parts for washing‑machine / juicer timers, keyboards, switch‑parts, connectors. Precision‑machinery & industrial components: high‑precision wear‑resistant low‑friction parts: gears, bearings, cams, screws, levers, pulleys, sprockets, valve‑pipe components. Consumer goods: zippers, buttons, toys, sports‑equipment。

Physical‑Mechanical‑Thermal‑Electrical Properties

Property Category	Item	Test Standard	Reference Range	Unit
Physical Properties	Density	ISO 1183	1.40‑1.42	g/cm³
	Water absorption (23 ℃,24 h)	ISO 62	0.2‑0.5	%
	MFR(190 ℃/2.16 kg)	ISO 1133	1‑40(grade‑X90 typical≈9 g/10min)	g/10 min
Mechanical Properties	Tensile yield strength	ISO 527‑2	50‑60	MPa
	Elongation at break	ISO 527‑2	25‑50	%
	Flexural strength	ISO 178	70‑80	MPa
	Flexural modulus	ISO 178	2500‑2800	MPa
	Charpy notched impact(23 ℃)	ISO 179/1eA	6‑15	kJ/m²
	Rockwell hardness M‑scale	ISO 2039‑2	78‑85	—
Thermal Properties	HDT (1.8 MPa)	ISO 75‑2/A	110‑124	℃
	Melting point	ISO 11357‑3	158‑165	℃
Electrical Properties	Volume resistivity	IEC 60093	10¹⁴‑10¹⁶	Ω·cm
Flammability	UL94(1.5 mm)	UL 94	HB	—

Injection‑Molding Parameters

Process Stage	Parameter	Recommended Range	Unit	Remarks
Pre‑drying	Drying temperature	80‑90	℃	Suggested drying, avoid bubble / silver‑mark, improve dimension & appearance.
	Drying time	2‑4	h
Barrel temperature	Rear zone	150‑170	℃	Narrow processing window; do not exceed 220 ℃ practically, formaldehyde decomposes under overheat.
	Middle zone	170‑190	℃
	Front zone	180‑200	℃
	Nozzle temperature	180‑200	℃	Slightly lower / close to front‑zone temperature to prevent drooling.
	Melt temperature(copoly‑POM)	190‑210	℃
	Mold temperature	80‑100	℃	High mold‑temperature improves crystallization, gloss and reduces sink‑marks.
Injection parameters	Injection pressure	80‑130	MPa	Higher for thin‑wall; lower for thick‑wall.
	Hold‑up pressure	40‑80	MPa	Proper hold‑pressure to compensate shrinkage & sink‑marks.
	Back pressure	0.5‑2.0	MPa	Low back‑pressure; high back‑pressure causes shear‑thermal degradation.
	Injection speed	Medium	—	Slow: flow marks; fast: jetting & degradation risk.
	Screw speed	50‑100	rpm	Avoid excessive screw‑speed to reduce shear heat.
	Barrel residence time	As short as possible (＜20‑30)	min	Long residence triggers decomposition.
Shutdown procedure	Short‑term shutdown	＜150	℃	Purge barrel fully for long‑term shutdown.
	Purging material	PE / PP	—	Avoid copper‑alloy contacting molten POM, risk of catalytic decomposition.

Note: All data for reference only！