PP Siam‑Siam P740J Resin

Material Introduction: PP Siam‑Siam P740J is high‑flow, high‑impact block‑copolymer polypropylene. It delivers well‑balanced rigidity, toughness and processability, and complies with food‑contact standards.

Main Applications

Automotive industry: automotive instrument panels, interior trim parts, bumpers, ventilation ducts, fans and other components.

Home appliances: washing‑machine inner & outer drums, frames and covers, refrigerator door liners, dishwasher door liners, dryer ventilation ducts.

Consumer goods: lawn & garden equipment (lawn mowers, sprinklers), furniture, toys, general‑purpose packaging and containers.

Food‑contact applications: compliant with FDA 21 CFR 177.1520, suitable for food containers and tableware.

Electrical & electronics: electrical equipment housings and electrical components.

Performance Parameters

Performance Category	Test Item	Test Condition	Reference Value	Unit	Reference Standard	Remarks & Interpretation
Basic Properties	Density	‑	0.91	g/cm³	ASTM D1505	Typical PP density.
	Melt Flow Rate(MFR)	230℃/2.16kg	27	g/10 min	ASTM D1238	High‑flow injection‑molding grade.
	Molding Shrinkage	Transverse(2.00 mm)	1.2	%	ASTM D955	Transverse direction shrinkage.
		Flow direction(2.00 mm)	1.4	%	ASTM D955	Flow direction shrinkage.
Mechanical Properties	Tensile Yield Strength	‑	28.4	MPa	ASTM D638	Tensile yield performance.
	Tensile Breaking Strength	‑	19.6	MPa	ASTM D638	‑
	Elongation at Break	‑	150	%	ASTM D638	Good ductility.
	Flexural Modulus	‑	1270	MPa	ASTM D790	High‑rigidity property.
	Izod Notched Impact Strength	23℃	78.5	J/m	ASTM D256	Room‑temperature impact toughness.
		0℃	39.2	J/m	ASTM D256	Low‑temperature impact at 0℃.
		-20℃	29.4	J/m	ASTM D256	Low‑temperature impact at‑20℃.
	Rockwell Hardness	R‑scale	70	‑	ASTM D785	Surface hardness.
Thermal Properties	Heat‑Distortion Temperature(HDT)	0.45 MPa, non‑annealed	110	℃	ASTM D648	High‑load‑free heat resistance.
	Heat‑Distortion Temperature(HDT)	1.8 MPa, non‑annealed	55	℃	ASTM D648	High‑load heat resistance.
	Brittleness Temperature	‑	‑20	℃	ASTM D746	Low‑temperature performance limit.
	Vicat Softening Temperature	‑	150	℃	ASTM D1525	Heat‑resistance indicator.
	Melting Temperature	‑	120‑163	℃	ASTM D2117	Melting range.
Other Properties	Flame‑retardant rating	2.00 mm	HB	‑	UL 94	General non‑flame‑retardant grade.
	Gloss	‑	30	‑	ASTM D2457	Medium‑gloss surface.
	Haze	‑	80	%	ASTM D1003	High‑haze, non‑transparent.

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	50‑90℃, recommended 50℃	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), max 1500‑1800 bar	Raise pressure for thin‑wall or complex‑structure parts; high flowability allows appropriately lower injection pressure.
Holding pressure	30%‑60% or 80% of injection pressure	Prevent sink mark and excessive shrinkage; holding time accounts for ~30% of cycle time.
Injection speed	High‑speed injection preferred	Reduce internal stress and deformation; may cause bubbles and flow marks for partial molds.
Screw speed	High screw speed(linear velocity 1.3 m/s) is permitted	Complete plasticization before cooling phase finishes.
Runner & gate	Runner diameter:4‑7 mm. Pin‑point gate:length 1‑1.5 mm, min diameter 0.7 mm. Edge gate:short length (~0.7 mm), depth=1/2 wall‑thickness, width=2×wall‑thickness. Mold venting: vent depth 0.025‑0.038 mm, width 1.5 mm for good exhaust.	‑

Disclaimer: All above data is for reference only.