PET (Polyester) vs PPS (unfilled): 0% composition overlap. Significantly different materials serving different application areas.
PET (Polyester) vs PPS (unfilled)
Side-by-side chemical composition and mechanical property comparison.
Overview
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.
PPS (unfilled)
Polyphenylene Sulfide — semi-crystalline high-performance thermoplastic. Broadest chemical resistance of any engineering plastic — no known solvents below 200°C. Inherently flame-resistant (V-0 without additives, LOI 44%). Very low moisture absorption (<0.02%). Brittle in unfilled form — usually glass-fiber reinforced for structural use. Trade names include Ryton (Solvay), Fortron (Celanese), Torelina (Toray), Durafide (Polyplastics). Used for chemical pump components, filter bags, electrical insulation, and as base resin for GF40 compounds.
| PET (Polyester) | PPS (unfilled) | |
|---|---|---|
| Material Number | — | — |
| Category | Polymers | Polymers |
| Standard | ISO 10350 | ISO 10350 |
Chemical composition (wt%) — Pro
| Element | PET (Polyester) | PPS (unfilled) | Overlap |
|---|---|---|---|
| Base Polymer (Polyethylene Terephthalate) | 99–99.9% | — | — |
| Base Polymer (Polyphenylene Sulfide) | — | 99–99.9% | — |
Mechanical properties — Pro
| Property | PET (Polyester) | PPS (unfilled) | Unit |
|---|---|---|---|
| Tensile Strength | 55–80 | 65–85 | MPa |
| Yield Strength | 50–60 | — | MPa |
| Elongation | 30–80 | 3–6 | % |
| Elastic Modulus | |||
| Density | |||
| Glass Transition Temp (Tg) | |||
| Melting Point | |||
| Water Absorption (24h) | |||
| Continuous Use Temp |
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PET (Polyester) and PPS (unfilled) 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 PET (Polyester) the same as PPS (unfilled)?
PET (Polyester) and PPS (unfilled) have a 0% composition overlap. They are generally not directly interchangeable.
Can I replace PET (Polyester) with PPS (unfilled)?
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 PET (Polyester) and PPS (unfilled)?
The main differences are in the following elements: overall alloying content. PET (Polyester) is a Polymers grade, while PPS (unfilled) 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.