PP Zhejiang Petrochemical HP552R Resin

Material Introduction: PP Zhejiang Petrochemical HP552R is fiber‑grade homopolymer polypropylene resin. It features high melt‑flow property and excellent spinnability, suitable for multiple processing methods and end‑use applications.

Main Applications

Textile & packaging: packing ropes, straps, luggage belts, automotive safety belts, mattress edge binding.

Non‑woven fabrics: non‑woven cleaning wipes, sanitary‑grade materials.

Fine filament & fiber: artificial fibers, BCF bulked continuous filament, CF spinning, carpet long‑filament products.

Performance Parameters

Performance Category	Test Item	Test Condition	Reference Value	Unit	Reference Standard	Remarks & Interpretation
Basic Properties	Melt Flow Rate(MFR)	230℃/2.16kg	25‑34	g/10min or cm³/10min	ASTM D1238, ISO 1133	Fiber‑grade high‑flow homopolymer PP.
	Density	‑	0.90	g/cm³	ASTM D1505	‑
Mechanical Properties	Tensile Yield Strength	‑	32	MPa	ASTM D638, ISO 527	‑
	Flexural Modulus	‑	1450‑1500	MPa	ASTM D790, ISO 178	‑
	Izod Notched Impact Strength	23℃	30	J/m	ASTM D256	Room‑temperature notched impact.
Thermal Properties	Heat‑Distortion Temperature(HDT)	0.45 MPa, non‑annealed	77‑94	℃	ASTM D648, ISO 75	‑
	Vicat Softening Temperature	‑	87‑153	℃	ASTM D1525, ISO 306	‑

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	‑
Barrel rear zone(feed section)	160‑180℃	Prevent thermal degradation.
Barrel middle zone(compression section)	180‑200℃	‑
Barrel front zone(metering section)	200‑220℃	‑
Nozzle temperature	200‑210℃	‑
Mold temperature	40‑80℃，recommended 50℃	Low mold temperature may result in poor surface quality, weld‑lines and flow‑marks; high temperature will cause warpage.
Injection pressure	80‑140 MPa(800‑1400 bar); up to 180 MPa(1800 bar) for thin‑wall parts.	‑
Holding pressure	30%‑60% of injection pressure	Prevent shrinkage cavity and excessive shrinkage.
Injection speed	High‑speed injection is normally adopted to reduce internal stress; if surface defects appear, try low‑speed injection at higher melt temperature.	‑
Runner & Gate	Typical cold‑runner diameter:4‑7 mm. All gate types are available, typical gate diameter:1‑1.5 mm. For edge gate, depth ≥ half of wall‑thickness, width ≥ twice of wall‑thickness. Round‑type gates and runners are preferred. Hot‑runner systems are applicable.	‑

Disclaimer: All above data is for reference only.