PA66 Shenma EPR27 Resin

Material Introduction: PA66 Shenma EPR27 (Pingdingshan Shenma) is a medium‑viscosity, unreinforced general‑purpose injection‑molding PA66 resin. Its core advantages are well‑balanced mechanical strength and toughness, excellent electrical insulation, UL94 V‑2 flame‑retardant rating and good processing flowability. Its inherent water‑absorption characteristic affects dimensional stability and partial properties; strict drying is required prior to processing.

Main Applications

Electronic‑electrical industry: Electrical components, connectors, switch housings, coil bobbins, timers, circuit‑breaker covers and other parts.

Automotive industry: General automotive components.

Mechanical parts & Industrial fittings: Mechanical components, home‑appliance parts and power‑tool accessories.

Fiber & monofilament: For bristle yarn, short‑cut fiber and other spinning‑industry applications.

Modification base resin: Serves as base resin for modified plastics (e.g. patent CN104672898A for high‑gloss low‑warpage reinforced nylon).

Performance Parameters

Performance Category	Test Condition / Standard	Unit	Typical Value	Remarks & Interpretation
Physical Properties
Density	‑	g/cm³	approx.1.13‑1.15	Typical PA66 unreinforced density
Relative Viscosity	QB	‑	2.67 ± 0.03	Medium‑viscosity grade
Melt Flow Rate (MFR)	275℃/2.16 kg, ISO 1133	g/10min	10.8	‑
Amino End Group (-NH₂)	QB	meq/kg	70 ± 4	‑
Carboxyl End Group (-COOH)	QB	meq/kg	70 ± 4	‑
Black‑Speck Content	QB	%	≤ 0.017	‑
Mechanical Properties
Tensile Strength	ISO 527‑2	MPa	75‑80.2	‑
Elongation at Break	ISO 527‑2	%	30‑35.2	‑
Flexural Strength	ISO 178	MPa	71.8	‑
Flexural Modulus	ISO 178	MPa	1800	‑
Tensile Modulus	ISO 527‑2	MPa	2500	‑
Charpy Notched Impact Strength	ISO 179/1eA	kJ/m²	2.5‑9.1	‑
Charpy Un‑notched Impact Strength	ISO 179/1eU	kJ/m²	No Break	‑
Izod Notched Impact Strength	ISO 180/1A	kJ/m²	7.9‑9.1	‑
Thermal Properties
HDT @1.8 MPa	ISO 75‑2/A	°C	65‑82.9	‑
Melting Point	ISO 3146	°C	252‑260	‑
Coefficient of Linear Thermal Expansion	ASTM D696	10⁻⁵/K	7.5	‑
Electrical Properties
Volume Resistivity	IEC 60093	Ω·cm	1.3 × 10¹⁴	‑
Dielectric Strength	IEC 60243‑1	kV/mm	17.3	‑
Flammability
UL94 Rating	UL 94	‑	V‑2	‑

Injection Molding Parameters

Processing Item	Recommended Range / Condition	Notes & Explanations
Drying Treatment	Hot‑air drying:80‑100 ℃ for 4‑6 h; extend drying time or adopt vacuum drying under high‑humidity conditions; target moisture content＜0.2%	Critical operation. PA66 readily absorbs moisture. Excess moisture triggers hydrolysis during processing, bringing bubbles, silver streaks and severe mechanical‑property deterioration. Use immediately after drying or seal and keep warm properly.
Melt Temperature	260‑290 ℃	Fine‑tune according to equipment and part geometry. Avoid temperature＞300 ℃ or long residence‑time to prevent degradation and discoloration.
Mold Temperature	60‑90 ℃	Proper mold temperature (e.g.80 ℃) delivers good crystallinity, surface gloss and mechanical performance. Lower mold temperature shortens cycle time.
Injection Pressure	60‑100 MPa, adjust per product & mold design	Adjust according to product structure and wall thickness.
Injection Speed	Medium‑high speed	Relatively fast speed facilitates filling and avoids short‑shot or weld‑line defects caused by rapid cooling.
Back Pressure	0.5‑1.0 MPa (5‑10 kgf/cm²)	Moderate back‑pressure homogenizes melt and improves venting; excessive back‑pressure reduces plasticizing efficiency and may induce overheating.
Screw Speed	Medium speed (50‑120 rpm)	Avoid excessive shear‑heat generation.
Runner & Gate	Runner and gate shall not be undersized	Nylon solidifies rapidly; sufficiently large gate dimension guarantees smooth filling.
Shutdown Instruction	Clean barrel with thermally stable PE / PP upon production pause or completion to prevent carbonized nylon residue. Turn off heating system for long‑term shutdown.	‑

Disclaimer: All above data is for reference only.