PP Liaoyang Petrochemical LHP456J Resin

Material Introduction: PP Liaoyang Petrochemical LHP456J is high‑melt‑flow spinning‑grade homopolymer polypropylene, specially designed for high‑speed spinning process. It features low ash content, high cleanliness and excellent spinnability.

Main Applications

Woven products: woven bags for grain, fertilizer, cement packaging, packing straps, ropes, 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	Reference Value	Unit	Reference Standard	Remarks & Interpretation
Basic Properties	Melt Flow Rate(MFR)	230℃/2.16kg	3.4	g/10 min	ISO 1133	Spinning‑grade homopolymer PP.
	Density	‑	0.90	g/cm³	ISO 1183	‑
Mechanical Properties	Tensile Modulus	‑	1500	MPa	ISO 527‑1/-2	‑
	Tensile Yield Strength	‑	34	MPa	ISO 527‑1/-2	‑
	Yield Elongation	‑	10	%	ISO 527‑1/-2	‑
	Elongation at Break	‑	＞50	%	ISO 527‑1/-2	‑
	Charpy Notched Impact Strength	23℃	4.0	kJ/m²	ISO 179/1eA	Room‑temperature notched impact.
	Charpy Un‑notched Impact Strength	23℃	190	kJ/m²	ISO 179/1eU	High un‑notched impact toughness.
	Ball Indentation Hardness	‑	74	MPa	ISO 2039‑1	Surface hardness.
Thermal Properties	Heat‑Distortion Temperature(HDT)	0.45 MPa, non‑annealed	97	℃	ISO 75‑1/-2	Low‑load heat resistance.
	Vicat Softening Temperature	A50 (50℃/h,10N)	154	℃	ISO 306	‑
	Vicat Softening Temperature	B50 (50℃/h,10N)	92	℃	ISO 306	‑

Injection‑Molding Process Parameters

Process Item	Suggested Range / Description	Remarks
Drying treatment	Generally unnecessary; dry at 80℃ for about 1 h under poor storage condition	PP low‑moisture‑absorption feature.
Barrel rear zone(feed section)	160～250℃ (reference:200℃)	Prevent thermal degradation.
Barrel middle zone(compression section)	200～300℃ (reference:220℃)	‑
Barrel front zone(metering section)	220～300℃ (reference:240℃)	‑
Nozzle temperature	220～300℃ (reference:240℃)	‑
Melt temperature	‑	220～280℃
Mold temperature	20～70℃，recommended 40～60℃	Crystallization mainly determined by mold temperature. Low temperature: poor surface, weld‑line and flow‑mark risks; high temperature will cause warpage.
Injection pressure	80～140 MPa(800～1400 bar); higher pressure for thin‑wall & complex parts, up to 180 MPa(1800 bar) except partial thin‑wall packaging containers.	‑
Holding pressure	30%‑60% of injection pressure	Prevent sink mark and excessive shrinkage; holding time accounts for approx. 30% of cycle time.
Back pressure	5～20 MPa(50～200 bar)	‑
Injection speed	Medium injection speed; high‑speed injection with accumulator required for thin‑wall packaging containers.	‑
Screw speed	High screw speed(linear velocity 1.3 m/s) is permitted	Complete plasticization before cooling phase finishes.
Runner & Gate	Pin‑point gate or multi‑point gate; heated hot‑runner, insulated hot‑runner, inner gate sleeve. Gate shall be set at thick‑wall position of product, otherwise severe shrinkage defect easily occurs.	Mold‑design suggestion.

Disclaimer: All above data is for reference only.