PPA EMS‑CHEMIE GV‑5H

PPA EMS‑CHEMIE GV‑5H Resin

Material Introduction: PPA EMS‑CHEMIE GV‑5H is a high‑performance 50% glass‑fiber‑reinforced semi‑aromatic polyamide, semi‑crystalline engineering plastic. It delivers high rigidity, high strength, excellent dimensional stability, outstanding chemical resistance, superior heat resistance, and retains favorable mechanical properties at elevated temperatures.

Main Applications

Automotive industry: Heat‑resistant & high‑strength components such as intake‑system parts, engine‑bay components, sensors, connectors and lighting‑system parts.

Electrical & electronics: High‑temperature‑working connectors, chip sockets, coil bobbins, circuit‑breaker components and power‑tool accessories.

Industrial applications: High‑strength and fatigue‑resistant structural parts for mechanical engineering, bearing cages, gears, hydraulic and pneumatic components.

Home appliance parts: Heat‑resistant structural components for high‑end household appliances.

Performance Parameters

Performance Category	Test Item	Test Condition	Test Standard	Typical Value	Unit	Remarks & Interpretation
Physical Properties	Density	‑	ISO 1183	1.56‑1.58	g/cm³	50% GF reinforced semi‑aromatic PPA
	Water Absorption(24h @23°C)	23°C	ISO 62	4.0‑4.5	%	‑
	Molding Shrinkage (flow direction)	‑	ISO 294‑4	0.05‑0.5	%	‑
	Molding Shrinkage (cross‑flow direction)	‑	ISO 294‑4	0.40‑0.50	%	‑
Mechanical Properties	Tensile Modulus	23°C, dry	ISO 527‑2/1	17000	MPa	‑
	Tensile Strength at Break	23°C, dry	ISO 527‑2/5	220	MPa	‑
	Elongation at Break	23°C, dry	ISO 527‑2/5	2.5‑3.0	%	‑
	Charpy Notched Impact Strength	23°C, dry	ISO 179/1eA	13‑15	kJ/m²	‑
Thermal Properties	Heat‑Distortion Temperature(HDT)	1.8 MPa, unannealed	ISO 75‑2/A	235‑240	℃	‑
	Heat‑Distortion Temperature(HDT)	8.0 MPa, unannealed	ISO 75‑2/C	165‑185	℃	‑
	Coefficient of Linear Thermal Expansion (flow)	‑	ISO 11359‑2	1.4E‑5‑1.5E‑5	cm/cm/℃	‑
	Coefficient of Linear Thermal Expansion (cross‑flow)	‑	ISO 11359‑2	7.0E‑5‑9.0E‑5	cm/cm/℃	‑
Electrical Properties	Volume Resistivity	‑	IEC 60093	1.0E+14	Ω·cm	‑
	Surface Resistivity	‑	IEC 60093	1.0E+13	Ω	‑
	Dielectric Strength	‑	IEC 60243‑1	33	kV/mm	‑
	Comparative Tracking Index(CTI)	‑	IEC 60112	600	V	‑
Flammability	UL94 Rating	0.8 mm	UL 94	HB	‑	‑

Processing Parameters

Processing Item	Typical Range	Remarks & Instructions
Drying Treatment	‑	Critical. PPA is highly hygroscopic. Sufficient drying before processing is mandatory, otherwise bubbles, silver streaks, surface defects and degraded mechanical properties may occur. Desiccant dryer is strongly recommended.
Drying Temperature	100‑120 ℃	‑
Drying Time	4‑6 h	Ensure moisture content ≤0.05%(500 ppm) or lower.
Barrel Temperature	‑	Adjust according to melting characteristics and mold structure. Semi‑aromatic polyamides feature high melting point.
Rear zone (feed zone)	300‑320 ℃	‑
Middle zone (compression zone)	310‑330 ℃	‑
Front zone (metering zone)	320‑340 ℃	‑
Nozzle Temperature	320‑340 ℃	‑
Melt Temperature	320‑340 ℃	Avoid excessive melt temperature and long residence time to prevent material degradation.
Mold Temperature	120‑140 ℃	Higher mold temperature improves crystallinity, surface gloss and mechanical performance, and reduces internal stress.
Injection Pressure	80‑120 MPa	Use the lowest feasible injection pressure for full filling and good surface quality.
Injection Speed	Medium‑high	Moderately fast injection facilitates filling; avoid excessive speed causing shear overheating or surface defects.
Screw Speed	50‑100 rpm	Medium speed; excessive shear will break glass fibers and degrade polymer.
Back Pressure	0.5‑1.0 MPa	Low back pressure for melt homogeneity. Excess back pressure aggravates glass‑fiber breakage.

Disclaimer: All above data is for reference only.