Victrex® 450 Series Equivalent — Joyrun K10 PEEK Grades

Moving off the Victrex® 450 series, the Joyrun K10 series maps grade for grade. Unlike the other families, a PEEK switch turns on two things: confidence in supply (lot-to-lot variation, approval history) and the fact that PEEK is semi-crystalline. Mould temperature sets crystallinity, and crystallinity governs dimensional stability and chemical resistance — one more variable than the amorphous sulfones.

Grade match

Property comparison

Values are representative values from each manufacturer's published TDS, not guaranteed values. Comparisons for 30% glass fibre (450GL30 ↔ K10GL30) and PTFE-lubricated (450FE20 ↔ K10FE20) are on the individual grade pages.

Where a PEEK switch actually gets blocked

Similar property tables do not mean a clear path. These are the places a switch actually stalls.

Semi-crystalline — mould temperature changes the properties

Unlike the sulfone family, PEEK is semi-crystalline. Mould temperature (typically 170–200°C) sets the degree of crystallinity, and crystallinity governs dimensional stability, chemical resistance and creep resistance. Mould too cold and the part freezes under-crystallised, then shifts dimensionally when it later sees heat, as crystallisation continues. Change supplier and crystallisation behaviour can differ subtly at the same settings, so re-verification has to include the annealing schedule. This step does not exist in a sulfone switch.

The bearing grade has a large HDT gap

K10LF30's HDT at 1.8 MPa is 293°C, 22°C below 450FC30's 315°C. That is the biggest gap in this family, and for a sliding part carrying load at high temperature it comes straight off the margin. For ambient-to-moderate sliding, friction and wear behaviour matter more. Tell us the service temperature and contact pressure and we will assess suitability.

On the carbon-fibre grade, strength and stiffness move in opposite directions

K10CA30 has higher tensile strength at 265 MPa (vs 260) but lower tensile modulus at 23 GPa (vs 25) and lower flexural strength at 370 (vs 380). Stronger, but less stiff. That favours parts designed to a break-strength criterion and works against parts designed to deflection. Establish which criterion governs before deciding.

Approval history and lot control are the real objection

The most common objection to a PEEK switch is not specification but confidence — lot-to-lot variation, raw-material traceability, aerospace / semiconductor / medical approval experience. Octud supplies Joyrun PEEK as the official Korean distributor through the authorised channel, with lot traceability. Ask us for quality documents or per-lot test certificates and we will prepare what your purchasing approval process needs.

How to evaluate the switch

1. 01Fix the matching grade — unfilled, GF30, CF30, bearing or PTFE-lubricated all carry different checks.
2. 02Establish whether the part is designed to strength or to stiffness. On the CF30 grades those two move in opposite directions.
3. 03Secure quality documents and per-lot test certificates early and run purchasing approval in parallel — it often takes longer than the technical verification.
4. 04Mould evaluation samples. Match your existing mould temperature, and for crystallinity-sensitive parts re-confirm the annealing schedule.
5. 05For high-temperature load-bearing parts verify dimensional change and creep at service temperature; for sliding parts verify friction and wear at real contact pressure and speed.

If moulding defects appear, the high-temperature resin moulding troubleshooting guide covers cause and corrective action by symptom.

Frequently asked questions

Can Joyrun K10G replace Victrex® 450G?

Unfilled 100% PEEK at 98 MPa tensile strength and HDT 152°C — effectively the same class as 450G, with a slightly higher tensile modulus of 4.0 GPa. Because PEEK is semi-crystalline and mould temperature drives crystallinity, we recommend a trial shot at your existing mould settings to confirm dimensions and properties.

Is changing PEEK supplier different from changing sulfone supplier?

Yes. The sulfone family is amorphous, so there is no crystallisation variable. PEEK is semi-crystalline: mould temperature sets crystallinity, and crystallinity directly affects dimensional stability, chemical resistance and creep resistance. A PEEK switch therefore adds a crystallinity and annealing re-verification step.

I heard the bearing grade K10LF30 has lower heat resistance.

Correct — HDT at 1.8 MPa is 293°C against 315°C for Victrex® 450FC30, a 22°C difference. For a sliding part under load at high temperature, that has to be checked against your design margin. For ambient-to-moderate sliding, coefficient of friction and wear rate are the more relevant indicators; tell us the service conditions and we will assess suitability.

What quality documentation is available?

Octud supplies Joyrun PEEK as the official Korean distributor through the authorised channel, with lot traceability. Per-lot test certificates, raw-material history and regulatory documents can be prepared on request for your purchasing approval.

Where can I buy Victrex 450G in Korea?

Victrex 450G itself is a Victrex product, bought through that manufacturer's own distribution. The grade that sits in the same place — Joyrun K10G · Joyrun K10GL30 · Joyrun K10CA30 · Joyrun K10LF30 · Joyrun K10FE20 — is supplied in Korea from stock by Octud, as genuine Joyrun material, with a 25 kg minimum order and evaluation samples for design verification.

Other families

• PSU · PolysulfoneUdel® P-1700 → Ultrason® S 2010→
• PPSU · PolyphenylsulfoneRadel® R-5000 → Ultrason® P 3010→

※ Victrex® is a registered trademark of Victrex plc, used here only as the comparison reference. Octud has no affiliation with Victrex plc. Joyrun is distributed by Octud as official Korean distributor. Values are representative values from each manufacturer's published TDS, not guaranteed values. An equivalency judgement does not replace design verification, and we recommend confirming the current TDS before selecting a grade.