PP Zhejiang Petrochemical EP548R Resin

Material Introduction: PP Zhejiang Petrochemical EP548R is high‑transparency low‑temperature heat‑sealing ter‑polymer polypropylene (PP‑RCT). It is specially developed for high‑end food and pharmaceutical packaging, featuring light transmittance ≥92% (haze ≤2%) and ultra‑low sealing initiation temperature of 110℃. Compliant with FDA and GB food‑contact certification, it is a cost‑effective domestic alternative for imported transparent film materials.

Main Applications

Automotive accessories: interior panels, mudguards, battery housings.

Home‑appliance accessories: small home‑appliance housings, internal structural parts.

Consumer goods: various containers, furniture, toys, sporting goods.

Thin‑wall products: suitable for thin‑wall packaging and containers by virtue of high‑flow property.

Performance Parameters

Performance Category	Test Item	Test Condition	Reference Value	Unit	Reference Standard	Remarks & Interpretation
Basic Properties	Melt Flow Rate(MFR)	230℃/2.16kg	21	g/10 min	ISO 1133, ASTM D1238	High‑flow ter‑polymer PP.
	Density	‑	0.905 / 0.90	g/cm³	ISO 1183, ASTM D1505	Dual reference values.
Mechanical Properties	Tensile Yield Strength	‑	27	MPa	ISO 527, ASTM D638	‑
	Flexural Modulus	‑	1550 / 1500	MPa	ISO 178, ASTM D790	Rigidity reference range.
	Elongation at Break	‑	＞50	%	ISO 527, ASTM D638	‑
	Charpy Notched Impact Strength	23℃	6 kJ/m² / 85 J/m(Izod)	kJ/m², J/m	ISO 179, ASTM D256	Different test standards data.
	Rockwell Hardness	R‑scale	98	‑	ASTM D785	Surface hardness.
Thermal Properties	Heat‑Distortion Temperature(HDT)	0.45MPa, non‑annealed	95℃ / 110℃(ASTM D648)	℃	ISO 75, ASTM D648	Low‑load heat‑resistance data.
	Vicat Softening Temperature	B50	149	℃	ISO 306, ASTM D1525	Heat‑resistance indicator.

Injection‑Molding Process Parameters

Process Item	Suggested Range / Description	Remarks
Drying treatment	Generally unnecessary; dry at 80℃ for 1‑2 h if damp 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℃	‑
Mold temperature	40‑80℃，recommended 50℃	Crystallization mainly determined by mold temperature. Low temperature: poor surface, weld‑line and flow‑mark risks; high temperature brings warpage risk.
Injection pressure	80‑140 MPa(800‑1400 bar)	Higher pressure available for thin‑wall or complex‑structure parts.
Holding pressure	30%‑60% of injection pressure	Prevent sink mark; holding time accounts for approx. 30% of cycle time.
Injection speed	Medium‑high injection speed	High flowability supports fast filling.
Screw speed	Medium screw speed	Avoid excessive shear heat leading to material degradation.

Disclaimer: All above data is for reference only.