PEEK GF30 vs PET (Polyester): 0% composition overlap. Significantly different materials serving different application areas.
PEEK GF30 vs PET (Polyester)
Side-by-side chemical composition and mechanical property comparison.
Overview
PEEK GF30
PEEK with 30% short glass fiber reinforcement. Dramatically increased stiffness (E-Mod 11 GPa vs 4.1 unfilled) and strength (UTS 160 vs 100 MPa) with reduced elongation and creep. Maintains PEEK's chemical resistance and high-temp capability (continuous 250°C). Trade names: Victrex 450GL30, TECAPEEK GF30 (Ensinger), KetaSpire GF30 (Solvay). Used for structural brackets, pump housings, valve seats, bearing cages, and semiconductor wafer handling where higher stiffness than unfilled PEEK is needed.
PET (Polyester)
Polyethylene Terephthalate (semi-crystalline stock shape) — combines the stiffness of POM with the wear resistance of PA, without centerline porosity or moisture sensitivity. Excellent dimensional stability, low friction, very low water absorption (~0.1%). Better creep resistance than POM or PA. Widely known from bottles/packaging, but engineering PET-P is semi-crystalline and much stiffer. Trade names include Ertalyte (MCAM), Arnite (DSM), Rynite (DuPont, GF grades). Used for precision bearings in water, gears, slide elements, pump parts, and electrical insulators.
| PEEK GF30 | PET (Polyester) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 527-1 | ISO 10350 |
Chemical composition (wt%) — Pro
| Element | PEEK GF30 | PET (Polyester) | Overlap |
|---|---|---|---|
| PEEK (Base Polymer) | 68–72% | — | — |
| Glass Fiber Reinforcement | 28–32% | — | — |
| Base Polymer (Polyethylene Terephthalate) | — | 99–99.9% | — |
Mechanical properties — Pro
| Property | PEEK GF30 | PET (Polyester) | Unit |
|---|---|---|---|
| Tensile Strength | 155–165 | 55–80 | MPa |
| Elongation | 2–3 | 30–80 | % |
| Elastic Modulus | 10500–11500 | 2.5–3 | MPa |
| Density | |||
| hdt_1.8mpa | |||
| Yield Strength | |||
| Glass Transition Temp (Tg) | |||
| Melting Point | |||
| Water Absorption (24h) |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
PEEK GF30 and PET (Polyester) have significantly different compositions (0% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is PEEK GF30 the same as PET (Polyester)?
PEEK GF30 and PET (Polyester) have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace PEEK GF30 with PET (Polyester)?
Generally not recommended. The compositions differ significantly (0% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between PEEK GF30 and PET (Polyester)?
The main differences are in the following elements: overall alloying content. PEEK GF30 is a Polymers grade, while PET (Polyester) is a Polymers grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
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