PA66 Dow‑DuPont FR50 Resin

Material Introduction: PA66 Dow‑DuPont FR50 is a high‑performance 25% glass‑fiber‑reinforced halogen‑free flame‑retardant PA66 engineering plastic. It features high strength, high rigidity and good heat resistance, together with outstanding UL94 V‑0 flame‑retardant performance and favorable electrical insulation. Its intrinsic water‑absorption property will affect dimensional stability and partial properties. Strict drying is mandatory before processing, and processing temperature shall be well‑controlled to avoid material degradation.

Main Applications

Electronic‑electrical industry: Connectors, coil bobbins, timers, cover circuit‑breakers, switch housings, sockets, joints, electrical panels, power jacks, instrument components & housings, electronic appliance enclosures, capacitors, micro‑switches and other parts.

Automotive industry: Automotive connectors and other auto components.

Industrial & office equipment: Office‑device parts, power‑tool components, lighting fixtures and home‑appliance parts.

Other fields: Sports‑equipment articles.

Performance Parameters

Performance Category	Test Condition / Standard	Unit	Typical Value	Remarks & Interpretation
Physical Properties
Density	ISO 1183 / ASTM D792	g/cm³	1.56‑1.60	25% glass‑fiber reinforced halogen‑free flame‑retardant grade
Water Absorption (24hr,23℃)	ISO 62 / ASTM D570	%	0.5‑0.6	‑
Molding Shrinkage (flow direction)	ISO 294‑4 / ASTM D792	%	0.30‑0.40	‑
Molding Shrinkage (cross‑flow direction)	ISO 294‑4	%	0.70‑0.80	Anisotropic shrinkage for glass‑filled grade
Mechanical Properties
Tensile Strength at Break	ISO 527‑2 / ASTM D638	MPa	158‑170	‑
Elongation at Break	ISO 527‑2 / ASTM D638	%	2.1‑2.6	Fiber‑reinforced low‑ductility feature
Tensile Modulus	ISO 527‑2	MPa	10600	‑
Flexural Strength	ISO 178 / ASTM D790	MPa	240	‑
Flexural Modulus	ISO 178 / ASTM D790	MPa	8960‑9410	‑
Charpy Notched Impact Strength (23℃)	ISO 179/1eA	kJ/m²	8.4‑12	‑
Izod Notched Impact Strength	ASTM D256	J/m	100‑105	‑
Thermal Properties
HDT @1.8 MPa	ISO 75‑2/A / ASTM D648	°C	235‑242	‑
HDT @0.45 MPa	ISO 75‑2/B / ASTM D648	°C	250‑257	‑
Melting Point	ISO 11357‑3 / ASTM D3418	°C	260‑262	‑
Coefficient of Linear Thermal Expansion (flow)	ISO 11359‑2	cm/cm/°C	2.1E‑5‑2.5E‑5	‑
Coefficient of Linear Thermal Expansion (cross‑flow)	ISO 11359‑2	cm/cm/°C	6.9E‑5‑7.9E‑5	‑
Electrical Properties
Volume Resistivity	IEC 60093 / ASTM D257	Ω·cm	10¹⁴‑10¹⁵	‑
Dielectric Strength	IEC 60243‑1 / ASTM D149	kV/mm	17.2‑24	‑
Relative Permittivity (1 MHz)	IEC 60250 / ASTM D150	‑	3.5‑3.6	‑
Comparative Tracking Index (CTI)	IEC 60112	V	275‑600	‑
Flammability
UL94 Rating (0.75 mm /1.5 mm /3.0 mm)	‑	‑	V‑0 (5VA at 1.5 mm in partial references)	Halogen‑free flame‑retardant grade
Limiting Oxygen Index (LOI)	ISO 4589‑2	%	35	‑

Injection Molding Parameters

Processing Item	Recommended Range / Condition	Notes & Explanations
Drying Treatment	Hot‑air drying:80‑90 ℃ for 2‑6 h (dehumidifying dryer recommended); or 80 ℃ for 2‑4 h. Adopt vacuum drying under high‑humidity environment; target moisture content ≤0.1%‑0.2%.	Critical operation. PA66 is susceptible to moisture‑induced hydrolysis. Excessive moisture causes bubbles, silver streaks, and severely degrades mechanical properties and flame‑retardant performance. Use immediately after drying or seal and keep warm properly.
Barrel Temperature	Rear zone:250‑260 ℃; Middle zone:260‑280 ℃; Front zone:270‑290 ℃; Nozzle:265‑275 ℃. Melt temperature:280‑300 ℃, recommended 290 ℃.	Do not exceed 300 ℃ to prevent degradation & discoloration of base resin and flame retardant, resulting in poor performance and appearance. Set barrel temperature 10‑30 ℃ higher than ordinary nylon for better flowability.
Mold Temperature	80‑100 ℃ (higher value reduces internal stress & improves surface gloss); alternative range 70‑120 ℃ (100 ℃ preferred), 50‑90 ℃ from partial references.	Higher mold temperature improves crystallinity and dimensional stability and reduces fiber floating, yet increases molding shrinkage.
Injection Pressure	Medium‑high pressure:60‑100 MPa, adjust per product & mold design.	Higher injection pressure benefits filling, improves glass‑fiber dispersion and lowers part shrinkage, meanwhile increases shear stress and molecular orientation.
Injection Speed	Medium‑high speed. Fast speed facilitates filling and suppresses fiber floating on surface; avoid excessive speed to prevent jet marks and glass‑fiber exposure.	Mold shall be well‑ventilated to avoid burn marks caused by trapped gas.
Back Pressure	0.5‑1.0 MPa. Moderate back‑pressure homogenizes melt and improves venting; excessive back‑pressure reduces plasticizing efficiency and may induce glass‑fiber breakage or overheating.	Slightly higher than unreinforced nylon.
Screw Speed	50‑100 rpm. Avoid high‑speed rotation which triggers excessive glass‑fiber fracture and material overheating.	Low‑to‑medium screw speed minimizes shear damage to glass fiber.
Runner & Gate	Gate dimension shall not be too small.	Nylon solidifies rapidly; gate location and size are critical for filling. Wear‑resistant mold steel (e.g. chrome‑plated) is required for glass‑fiber abrasion resistance.
Holding Pressure	50.0‑100 MPa	‑
Holding Time	3.00 s/mm	Value depends on part wall thickness.
Maximum Screw Tangential Speed	12 m/min	‑

Disclaimer: All above data is for reference only.