POM Shenhua Ningmei MC90

POM 神华宁煤 MC90，高刚性高强度共聚 POM‑C，尺寸稳定性佳，机械性能优良，耐化学介质性能良好。

Main Applications

Automotive: fuel‑pump components, fuel‑cap, seat‑belt parts and other interior functional parts requiring high rigidity & dimensional‑stability. Electrical & electronic: gears, bearings and structural components for washing‑machines, refrigerators, shavers and other household‑appliances. Precision machinery: high‑precision gears, bearings, cams, screws and other mechanical‑parts with requirements for high‑wear‑resistance and low‑friction. Consumer & industrial goods: window‑frame & shutter components, toys, game‑console parts and industrial accessories requiring high rigidity & dimensional‑stability。

Physical‑Mechanical‑Thermal‑Electrical Properties

表格

Property Category	Item	Test Standard	Value	Unit
Physical Properties	Density	ASTM D‑792	1.41	g/cm³
	Water absorption(24 h, 23 ℃)	ASTM D‑570	0.22	%
	MFR (190 ℃ / 2.16 kg)	ASTM D‑1238	9.0±1	g/10 min
	Molding shrinkage	—	1.8‑2.2	%
Mechanical Properties	Tensile yield strength	ASTM D‑638	62	MPa
	Elongation at break	ASTM D‑638	45	%
	Flexural strength	ASTM D‑790	85	MPa
	Flexural modulus	ASTM D‑790	2700	MPa
	Izod notched impact 23 ℃	ASTM D‑256	6.5	kJ/m²
	Rockwell hardness M‑scale	ASTM D‑785	75	—
Thermal Properties	HDT (1.8 MPa)	ASTM D‑648	110	℃
	HDT (0.45 MPa)	ASTM D‑648	158	℃
	Melting point(DSC)	DSC	165	℃
Flammability	UL94	UL 94	HB	—

Injection‑Molding Parameters

表格

Process Stage	Parameter	Recommended Range	Unit	Remarks
Pre‑drying	Drying temperature	80‑90	℃	Drying recommended; avoid surface haze, improve dimensional‑stability & appearance。
	Drying time	2‑4	h
	Residual moisture	＜0.15	%	Target moisture content。
Barrel temperature	Rear zone	170‑190	℃	Narrow processing window. Strictly ≤220 ℃, overheating releases formaldehyde gas。
	Middle zone	180‑200	℃
	Front zone	185‑210	℃
	Nozzle temperature	180‑210	℃	Slightly below or close to front zone, prevent drooling。
	Melt temperature	190‑210	℃
	Mold temperature	80‑100	℃	Higher mold‑temp promotes crystallization, gloss and reduces sink‑marks。
Injection parameters	Injection pressure	49‑98	MPa	Higher for thin‑wall, lower for thick‑wall articles。
	Hold‑up pressure	Close to injection‑pressure	MPa	Relatively high hold‑pressure to counter pressure‑drop and shrinkage。
	Back pressure	0.5‑3.0	MPa	Keep low; excessive back‑pressure causes shear‑overheat degradation。
	Injection speed	Medium	—	Suggested condition: medium‑pressure, medium‑speed, moderate‑low melt‑temp, relatively high mold‑temp。
	Screw speed	100‑150	rpm	Avoid excessive rotational speed; minimize cushion residual to reduce shear heat。
Post‑treatment	Annealing	Optional	—	Normally unnecessary; annealing 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	℃	Long‑term shutdown purge barrel with PE / PP。

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