PPS Resin Supplier China | GF40 & High-Heat Grades

How to compare PPS grade families

Choose PPS by the service envelope first — heat, chemical contact and electrical duty — then by the filling system. The polymer is the same; the filler decides whether the part survives.

Grade family	What it changes	Where it is used	Confirm before ordering
Unfilled PPS	Highest purity, lowest stiffness	Linings, film, slurry parts	Melt flow, colour, purity
40% glass fibre	Stiffness, heat deflection, stability	Pump housings, brackets, connectors	Fibre loading, coupling, anisotropy
Glass/mineral	Flatness, warp control, lower cost	Housings, bobbins, large plates	Filler ratio, shrinkage balance
Wear-modified	Friction and wear behaviour	Bearings, seals, thrust washers	PV test method, counterface
Conductive or ESD	Controlled surface resistivity	Fuel-system and electronic parts	Resistivity range, filler type

Specifications to put in your RFQ

Service temperature — continuous and peak, plus the duration at peak
Chemical exposure — the actual media, concentration and temperature, not a generic "chemical resistance"
Filler system — fibre or mineral type and loading, and whether the datasheet is for the compound or the base resin
Flame rating — the UL 94 classification and the thickness it was tested at
Electrical duty — dielectric strength, tracking index and any ESD target
Dimensional limits — flatness or concentricity, since filled PPS shrinks differently along and across flow

Documents to request before you pay

Certificate of Analysis for the lot: melt flow, filler content, moisture at delivery
Technical Data Sheet stating the RTI (relative temperature index) and the moulding window
UL Yellow Card if a flame rating is claimed, matched to your part thickness and colour
REACH SVHC and RoHS statements, plus a Safety Data Sheet — see RoHS and REACH requirements for modified PPS
Chemical resistance data for your media, on the compound rather than the base polymer
Automotive or electrical approvals where the part enters a regulated assembly

Moulding, tooling and the mistakes that cost parts

Specifying PPS on a machine that cannot hold mould temperature. A cold tool gives a part that creeps and changes size later. Confirm the TDS window and your heater capacity.
Ignoring weld lines. Filled PPS loses strength at knit lines. Place gates so welds fall away from load paths.
Overusing regrind. Agree a regrind ratio and re-test mechanical properties on parts containing it.
Underestimating tool wear. Glass-filled compounds are abrasive: specify wear-resistant steel and a shot-life clause.
Expecting bright colours. PPS is naturally dark and opaque; a light or vivid finish means this is the wrong resin.
Skipping the boundary check. Mild duty may suit PBT or PA66 for less; extreme duty may need PEEK. Decide before steel is cut.

Frequently Asked Questions

When should I choose PPS instead of PBT?

PPS wins when the part sees sustained heat, aggressive chemicals or both. PBT moulds more easily and costs less for milder duty; see the full comparison.

Is PPS flame retardant without additives?

PPS is inherently flame retardant and commonly reaches UL 94 V-0 without a halogen package, but the rating depends on thickness and colour. Ask for the Yellow Card.

Does PPS need drying like nylon?

Much less. PPS absorbs very little moisture, so it is far more forgiving than PA66 or PET at the hopper; still follow the TDS drying window.

Why is 40% glass the most quoted PPS grade?

GF40 balances stiffness, heat deflection and dimensional stability at a compound cost most programmes accept. The trade-offs are covered in the GF40 grade guide.