PEEK Resin Supplier China | Unfilled, GF30 & Bearing Grades

How to compare PEEK grade branches

The backbone is the same across the family; what changes is the filler and the regulatory file behind it. Pick from the duty cycle, then from the paperwork you owe your customer.

Branch	What it changes	Typical use	Confirm first
Unfilled	Purity, toughness	Seals, liners	Virgin, melt flow
30% glass	Stiffness, stability	Housings, plates	Loading, anisotropy
30% carbon	Wear, friction	Bearings, pump parts	Wear test method
Bearing grade	Tribology	Bushings, washers	PV limit
Medical	Biocompatibility file	Instruments, trials	Lot record

Specifications to put in your RFQ

Temperature — continuous and peak, plus time spent at peak
Mechanical duty — load, speed and counterface for wear parts
Media — actual fluids and any sterilisation cycles
Grade branch — filler type and loading, on the compound datasheet
Compliance file — named by standard, not "as required"
Virgin-only clause — whether regrind is acceptable

Documents and compliance to request

Lot Certificate of Analysis with melt flow and filler content
Technical Data Sheet giving the processing window and annealing guidance
Lot traceability to the polymer batch — aerospace and medical routinely require it
REACH SVHC and RoHS statements plus SDS; the EU checklist applies here too
Food contact declaration against EU 10/2011 or FDA 21 CFR as applicable
Biocompatibility evidence — USP Class VI and ISO 10993 on the finished material

Moulding, machining and the costly mistakes

Assuming the moulder can run it. PEEK needs far higher barrel and mould temperatures than commodity resins. Make the supplier state that capability in writing.
Skipping annealing. Crystallinity drives final dimensions and creep; re-measure critical features after annealing, not before.
Tooling before proving geometry. Below a few hundred parts, machining stock shape is faster. See CNC versus injection moulding.
Copying steel tolerances. PEEK moves with heat and load; quote the ISO plastics series and state measurement temperature — see the tolerance guide.
Ignoring scrap economics. Near-net-shape tooling and a written regrind policy decide affordability.
Over-specifying. Hot but lightly loaded duty often suits PEI (Ultem) or glass-filled PPS.

Frequently Asked Questions

Can PEEK replace a metal part directly?

Only after re-checking stiffness, creep and load at temperature. Where heat, wear or chemicals kill the polymer below it, PEEK is usually the candidate — but compare datasheet values at your service temperature first.

Why is PEEK so expensive, and what controls the cost?

The polymer costs many times more than nylon, so material dominates the part price. Control it through near-net-shape design, scrap limits, a regrind policy and buying the branch you actually need. Ask suppliers to state the resin share of the unit price.

Do I need a different moulding machine?

Yes, for temperature capability. Confirm barrel heater capacity, screw design and the mould-temperature unit against the TDS window. A machine that only reaches polyolefin temperatures cannot process it.

Is every PEEK grade medical suitable?

No. Implantable work needs its own biocompatibility and traceability package; never substitute grades on a regulated device. The 450GL30 grade guide shows how one grade is documented.

Machine prototypes or cut a mould first?

Machine first below a few hundred pieces or before geometry is settled: real parts in days, and you learn the annealing behaviour before spending on tooling.