FKM (Fluoroelastomer / Viton) vs PBT GF30: 0% composition overlap. Significantly different materials serving different application areas.
FKM (Fluoroelastomer / Viton) vs PBT GF30
Side-by-side chemical composition and mechanical property comparison.
Overview
FKM (Fluoroelastomer / Viton)
Fluoroelastomer — THE high-temperature and chemical-resistant rubber. Outstanding resistance to oils, fuels, acids, and solvents at temperatures up to 200°C (short-term 230°C). Fluorine content (64-70%) determines chemical resistance. Trade names: Viton (Chemours), Tecnoflon (Solvay), Dai-El (Daikin). 5-10x more expensive than NBR. Used for aerospace fuel seals, chemical process seals, automotive fuel injector O-rings, semiconductor processing, and any seal exposed to aggressive chemicals at high temperature.
PBT GF30
Polybutylene Terephthalate with 30% glass fiber — THE connector and electrical component material. Key advantage over PA6 GF30: near-zero moisture absorption (0.02-0.2%), so mechanical and electrical properties are stable regardless of humidity. Lower UTS than PA6 GF30 but consistent. Trade names include Ultradur B4300 G6 (BASF), Valox 420 (SABIC), Celanex (Celanese), Crastin (DuPont). Used for electrical connectors, relay housings, coil formers, automotive sensors, and any part requiring dimensional stability in humid environments.
| FKM (Fluoroelastomer / Viton) | PBT GF30 | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 37 | ISO 10350 |
Chemical composition (wt%) — Pro
| Element | FKM (Fluoroelastomer / Viton) | PBT GF30 | Overlap |
|---|---|---|---|
| Vinylidene Fluoride (VDF) | 30–60% | — | — |
| Hexafluoropropylene (HFP) | 25–45% | — | — |
| Tetrafluoroethylene (TFE) | 0–30% | — | — |
| PBT (Base Polymer) | — | 68–72% | — |
| Glass Fiber Reinforcement |
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Sign up free — 3 comparisons/day freeMechanical properties — Pro
| Property | FKM (Fluoroelastomer / Viton) | PBT GF30 | Unit |
|---|---|---|---|
| Tensile Strength | 8–17 | 145–165 | MPa |
| Elongation | 150–350 | 2–3 | % |
| hardness_shore_a | 60–90 | — | Shore A |
| Density | |||
| continuous_service_temp | |||
| Elastic Modulus | |||
| hdt_1_8mpa | |||
| Melting Point | |||
| Water Absorption (24h) | |||
| Tensile Strength | |||
| Tensile Modulus | |||
| Elongation at Break | |||
| Charpy Impact (notched) | |||
| Density | |||
| Melting Point | |||
| HDT/A (1.8 MPa) | |||
| Water Absorption (24h) | |||
| Glass Fiber Content |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
FKM (Fluoroelastomer / Viton) and PBT GF30 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 FKM (Fluoroelastomer / Viton) the same as PBT GF30?
FKM (Fluoroelastomer / Viton) and PBT GF30 have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace FKM (Fluoroelastomer / Viton) with PBT GF30?
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 FKM (Fluoroelastomer / Viton) and PBT GF30?
The main differences are in the following elements: overall alloying content. FKM (Fluoroelastomer / Viton) is a Polymers grade, while PBT GF30 is a Polymers grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.