PP Maoming Petrochemical K7726H Resin

Material Introduction: PP Maoming Petrochemical K7726H is high‑flow impact‑resistant block‑copolymer polypropylene. It delivers good stiffness‑toughness balance, low odor, high whiteness and excellent processability for multiple application fields.

Main Applications

Home appliances: Mainly used for washing machine inner tubs, outer tubs and related components. Low‑odor property is well‑suited for home appliances with high hygiene‑safety requirements. This grade is massively adopted by Midea‑owned Toshiba home‑appliance products for export to Japan.

Automotive industry: For automotive interior & exterior parts, used as base resin for modified automotive interior components.

Thin‑wall injection‑molded articles: High melt flowability fits thin‑wall production and helps reduce raw‑material consumption.

Performance Parameters

Performance Category	Test Item	Typical Value	Test Condition / Reference Standard	Remarks & Interpretation
Physical Properties	Melt Flow Rate(MFR)	24.2‑35.0 g/10min	230℃/2.16kg, GB/T 3682	High‑flow block‑copolymer PP
	Ash Content	≤0.02 %	GB/T 9345.1	‑
Mechanical Properties	Tensile Yield Strength	25.5‑29.1 MPa	GB/T 1040.2	‑
	Flexural Modulus	1090‑1310 MPa	GB/T 9341	‑
	Izod Notched Impact Strength	12 kJ/m² (23℃)；4.7 kJ/m² (-20℃)	GB/T 1843	‑
	Rockwell Hardness	R‑100	GB/T 9342	‑
Thermal Properties	Heat‑Distortion Temperature(HDT)	95‑100 ℃	GB/T 1634.2 (1.82 MPa)	‑
Other Properties	Yellow Index	≤4 △Y.I.	‑	‑

Processing Parameters

Processing Item	Reference Range	Remarks & Instructions
Drying Treatment	Normally not required	PP features extremely low water‑absorption. Drying is unnecessary under proper storage. Dry at 80 ℃ for 1‑2 h if material gets damp.
Barrel Temperature	200‑275℃	Homopolymer PP melting point:164‑170℃. Do not exceed 275 ℃ to prevent material degradation.
Mold Temperature	40‑80℃	Recommended:50℃. Higher mold temperature improves surface gloss, dimensional stability and weld‑line strength; lower mold temperature shortens molding cycle.
Injection Pressure	68.6‑137.2 MPa, up to 1800 bar	Adjust per flow‑length and part structure. Appropriately lower injection pressure for this high‑flow grade.
Injection Speed	High‑speed injection	High‑speed injection minimizes internal pressure. Try low‑speed injection at higher melt temperature if surface defects occur.
Holding Pressure	30%‑60% of injection pressure	Sufficient holding pressure reduces shrinkage and sink marks. Avoid excessive holding time to prevent high internal stress.
Back Pressure	0.5‑1.0 MPa	Moderate back‑pressure improves melt homogenization and venting. Not mandatory; too low back‑pressure may cause air entrapment in melt.
Screw Speed	50‑100 rpm	Avoid excessive screw speed to prevent shear‑induced overheating.

Disclaimer: All above data is for reference only.