PP Zhejiang Petrochemical HP550J Resin

Material Introduction: PP Zhejiang Petrochemical HP550J is spinning‑grade homopolymer polypropylene. It features good rigidity and balanced mechanical properties, mainly designed for extruded flat‑yarn processing.

Main Applications

Woven products: woven bags for grain, fertilizer and cement packaging, packing straps, ropes, brushes, net‑type products, carpet base fabrics.

Injection‑molded products: automotive interior parts (seat frames, interior panels), home‑appliance housings (computer cases, TV housings), household articles (plastic chairs, tables, storage boxes) and daily‑use goods.

Performance Parameters

Performance Category	Test Item	Test Condition	Value / Range	Unit	Reference Standard	Remarks & Interpretation
Basic Properties	Melt Flow Rate(MFR)	230℃/2.16kg	2.8‑3.5 / 3.0‑3.2	g/10 min	ASTM D1238, ISO 1133	Spinning‑grade homopolymer PP.
	Density	‑	0.90	g/cm³	ASTM D1505, ISO 1183	‑
Mechanical Properties	Tensile Yield Strength	‑	33‑35.3	MPa	ASTM D638, ISO 527	‑
	Flexural Modulus	‑	1370‑1550	MPa	ASTM D790, ISO 178	‑
	Elongation at Break	‑	＞200 (elongation at yield approx.12%)	%	ASTM D638	‑
	Izod Notched Impact Strength	23℃	29‑55	J/m	ASTM D256	Room‑temperature notched impact.
	Rockwell Hardness	R‑scale	94‑102	‑	ASTM D785	Surface hardness.
Thermal Properties	Heat‑Distortion Temperature(HDT)	0.45 MPa / 0.46 MPa, non‑annealed	82‑94	℃	ASTM D648, ISO 75	Low‑load heat resistance.
	Vicat Softening Temperature	‑	155‑156	℃	ASTM D1525, ISO 306	Heat‑resistance indicator.

Injection‑Molding Process Parameters

Process Item	Suggested Range / Description	Remarks
Drying treatment	Generally unnecessary; dry at 80℃ for 1‑2 h under poor storage condition	PP low‑moisture‑absorption feature.
Barrel rear zone(feed section)	160‑200℃	Prevent thermal degradation.
Barrel middle zone(compression section)	180‑220℃	‑
Barrel front zone(metering section)	200‑240℃	‑
Nozzle temperature	200‑240℃	‑
Melt temperature	‑	220‑275℃
Mold temperature	40‑80℃，recommended 50℃	Crystallization mainly determined by mold temperature. Poor surface, weld‑line and flow‑mark defects may occur at low temperature; warpage will easily occur above 90℃.
Injection pressure	Up to 1800 bar (approx.180 MPa)	‑
Injection speed	High‑speed injection is preferred to minimize internal pressure; if surface defects occur, adopt low‑speed injection under higher melt temperature.	‑
Runner & Gate	For cold‑runner system, typical runner diameter:4‑7 mm. All gate types are applicable; typical gate diameter:1‑1.5 mm (edge gate: minimum depth = 1/2 wall thickness, minimum width ≥2×wall thickness). Hot‑runner system is fully compatible for PP.	Mold‑design suggestion.

Disclaimer: All above data is for reference only.