PA66 Resin Supplier China | Nylon 66 GF30 & FR Grades

How to compare PA66 grade families

Specify nylon 66 by reinforcement first, viscosity second: the same base polymer behaves very differently at 15% and at 50% glass fibre. Pick the family from the service conditions.

Grade family	What it changes	Typical uses	Confirm before ordering
Unfilled PA66	Balanced stiffness, fatigue and wear; lowest-cost base	Cable ties, clips, bearings, housings	Relative viscosity, heat stabiliser package
Glass fibre reinforced	Much higher stiffness, HDT and creep strength	Brackets, fan blades, tool bodies	Fibre loading by ash test, fibre length
Heat stabilised	Longer life at elevated temperature and humidity	Radiator end tanks, coolant connectors	Stabiliser type, ageing data at temperature
Flame retardant	UL 94 V-0, halogen-free or brominated systems	Connectors, terminal blocks, switchgear	Rating at thinnest wall, on Yellow Card
Toughened or wear modified	Impact modifiers, MoS2, PTFE or carbon fibre	Gears, bushings, slides, casters	Friction coefficient, PV limit, impact value

Specifications to put in your RFQ

Reinforcement — glass fibre, mineral, carbon fibre or beads, with the loading
Viscosity — relative viscosity to ISO 307, or melt volume rate with the test load stated
Property basis — ask whether quoted strength is dry-as-molded or conditioned; nylon absorbs moisture, so the two differ
Service profile — continuous and peak temperature, plus every medium: coolant, oil, fuel, salt, cleaning agents
Flammability and colour — the UL 94 rating and the thinnest wall, because flame retardants and pigments interact
Delivery form — natural or coloured, moisture-barrier packaging, lot size, regrind allowance
Conversion route — injection moulding, extrusion, monofilament or film, which sets the viscosity you need

Documents to request before you pay

Certificate of Analysis for the lot: relative viscosity, moisture at delivery, tensile data, filler content
Technical Data Sheet for the exact grade code, showing dry-as-molded and conditioned values
UL Yellow Card, plus a written statement of the flame-retardant system for halogen-free claims
Food-contact declaration against EU 10/2011 or FDA 21 CFR 177.1500 where the part touches food or water
REACH SVHC and RoHS statements, an IMDS entry for automotive, and a Safety Data Sheet

Drying, processing and common sourcing mistakes

Skipping drying. Nylon is hygroscopic: moisture causes hydrolysis, splay and brittle parts. Agree drying time, temperature and dew point, and keep pellets sealed.
Swapping PA66 for PA6 on price. PA66 melts higher and holds more stiffness; PA6 flows more easily and finishes smoother. The change alters shrinkage and validation — see PA6 vs PA66.
Designing to dry-as-molded strength. Parts in humid service condition: they gain toughness and lose stiffness.
Ignoring fibre orientation. Reinforced nylon shrinks unevenly, so gate position and packing drive warpage more than the grade does.
Assuming hydrolysis resistance. Test hot water and glycol at your temperature, do not infer it.
Reusing regrind without a rule. Nylon degrades each pass; agree a maximum ratio and re-dry it.

Frequently Asked Questions

Is PA66 the same material as PA6?

No. Both are nylons, but PA66 melts higher and holds stiffness and heat resistance better, while PA6 processes more easily and finishes smoother. They are not interchangeable without revalidation.

How much does glass fibre change the material?

A great deal. Reinforcement raises stiffness, heat-deflection temperature and creep resistance, but cuts elongation and can make weld lines the weak point. See what GF30 changes.

Do nylon 66 pellets need drying before moulding?

Yes — it is the most common cause of brittle nylon parts. Dry to the grade's specified moisture level with a monitored dew point, and keep pellets sealed. See the resin drying guide.

When should I choose POM instead of PA66?

Acetal wins where dimensional stability in water and low friction matter more than temperature resistance; nylon wins on toughness, heat and wear under load. The POM vs PA66 comparison goes part by part.

Why do resin quotes for PA66 move so much?

Nylon pricing tracks feedstock, intermediates and plant capacity more sharply than commodity resins, and reinforced or flame-retardant compounds carry premiums. Read what moves plastic resin prices before fixing a contract period.