POM DuPont Delrin 570 NC000

POM DuPont Delrin® 570 NC000

POM DuPont Delrin® 570 NC000 is 20 wt% short‑glass‑fiber reinforced medium‑viscosity homopolymer‑acetal (POM‑H). It delivers high stiffness, low‑warpage, improved heat‑resistance, excellent wear‑resistance, good dimensional‑stability and superior creep‑resistance, with built‑in release agent, injection‑molding grade。

Main Applications

Automotive: fuel‑pump components, fuel‑cap, seat‑belt parts, window‑regulator parts, door‑lock assemblies, rear‑view‑mirror components, high‑rigidity interior functional parts. Electrical & electronic: gears, bearings, structural housings for home appliances, electronic connectors. Precision‑machinery & industrial components: high‑precision, high‑stiffness gears, bearings, cams, screws, levers and pulleys. Consumer goods: engineering components requiring high rigidity and tight dimensional tolerance。

Physical‑Mechanical‑Thermal‑Electrical Properties

Property Category	Item	Test Standard	Value / Range	Unit
Physical Properties	Density	ISO 1183	1.56	g/cm³
	Water absorption (23 ℃, 24 h immersion)	ISO 62	0.80	%
	Water absorption (50 %RH equilibrium)	ISO 62	0.10‑0.22	%
	MVR (190 ℃ / 2.16 kg)	ISO 1133	7.00	cm³/10 min
	Molding shrinkage (flow)	ISO 294‑4	1.6‑1.8	%
	Molding shrinkage (transverse)	ISO 294‑4	1.2‑1.8	%
Mechanical Properties	Tensile strength (yield, 23 ℃)	ISO 527‑2	53.0‑59.0	MPa
	Elongation at break	ISO 527‑2	12	%
	Tensile modulus	ISO 527‑2	4900‑6200	MPa
	Flexural modulus	ISO 178	4600‑6410	MPa
	Charpy notched impact 23 ℃	ISO 179/1eA	3.5	kJ/m²
	Charpy notched impact ‑30 ℃	ISO 179/1eA	3.0	kJ/m²
	Charpy un‑notched impact 23 ℃	ISO 179/1eU	54	kJ/m²
	Charpy un‑notched impact ‑30 ℃	ISO 179/1eU	50	kJ/m²
	Izod notched impact 23 ℃	ISO 180/1A	6.0	kJ/m²
Thermal Properties	HDT (1.8 MPa)	ISO 75‑2/A	120‑125	℃
	HDT (0.45 MPa)	ISO 75‑2/B	163‑165	℃
	Melting temperature	ISO 11357‑3	178	℃
	Vicat softening B50	ISO 306/B50	160	℃
	CLTE (transverse)	ISO 11359‑2	6.0×10⁻⁵	cm/cm/℃
	CLTE (flow)	ISO 11359‑2	8.5×10⁻⁵	cm/cm/℃
Electrical Properties	Volume resistivity	IEC 60093	1×10¹⁵	Ω·cm
	Surface resistivity	IEC 60093	＞1×10¹⁵	Ω
	CTI	IEC 60112	600	V
Flammability	UL94 (1.5 mm)	UL 94	HB	—

Injection‑Molding Parameters

Process Stage	Parameter	Recommended Range	Unit	Remarks
Pre‑drying	Drying temperature	80‑100	℃	Drying is recommended for GF‑POM, target moisture＜0.15 %, avoid bubbles and silver‑streaks.
	Drying time	2‑4	h
Barrel temperature	Rear zone	170‑190	℃	Narrow thermal window; max safe melt ≤220 ℃, overheat causes formaldehyde decomposition.
	Middle zone	180‑200	℃
	Front zone	190‑210	℃
	Nozzle temperature	180‑210	℃	Close to front‑zone temperature to prevent drooling.
	Melt temperature	190‑210	℃	Homopolymer POM‑H practical range.
	Mold temperature	80‑100	℃	Higher mold temp improves crystallization, gloss and reduces sink‑marks.
Injection parameters	Injection pressure	80‑130	MPa	Higher for thin‑wall parts.
	Hold‑up pressure	40‑80	MPa	Compensate shrinkage.
	Back pressure	0.5‑2.0	MPa	Keep as low as possible; high back‑pressure brings excessive shear heat and fiber breakage.
	Injection speed	Medium, multi‑stage	—	Too‑slow: flow marks; too‑fast: jetting, fiber fracture.
	Screw speed	50‑100	rpm	Avoid high rpm to reduce shear heating and fiber attrition.
	Barrel residence time	＜20	min	Short residence time mandatory.
Shutdown procedure	Short‑term stop	Drop barrel temp below 150	℃	Long‑term shutdown: fully purge with PE / PP.
	Purge note	PE / PP	—	Do NOT contact molten POM with copper‑alloy; fully purge halogen‑containing polymers before POM processing.
Post‑treatment	Annealing (optional)	—	—	For high‑precision parts working under non‑ambient condition, relieve residual stress.

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