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.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| ISO | INT | PET | — | REF | |
| 🇺🇸 | ASTM | USA | ASTM D5927 | — | 100% |
| 🇪🇺 | TRADE | Europe | Ertalyte PET-P (MCAM) | — | 95% |
Sources: ISO 7744, ASTM D5927, MCAM TDS
Chemical composition comparison (wt%)
Side-by-side: PET (Polyester) (COMPOSITION) (ISO 7792) vs Ertalyte PET-P (MCAM) (TRADE)
| Element | PET (Polyester) (COMPOSITION) | Ertalyte PET-P (MCAM) (TRADE) | Overlap |
|---|---|---|---|
| Base Polymer (Polyethylene Terephthalate) | 99–99.9% | — | — |
Mechanical properties
Semi Crystalline
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 55–80 | MPa |
| Yield Strength | 50–60 | MPa |
| Elongation | 30–80 | % |
| Elastic Modulus | 2.5–3 | GPa |
| Density | 1.33–1.4 | g/cm3 |
| Glass Transition Temp (Tg) | 80–84 | °C |
| Melting Point | 250–260 | °C |
| Water Absorption (24h) | 0.08–0.12 | % |
Compatibility verdict
PET (Polyester) and Ertalyte PET-P (MCAM): 95% composition match
Close equivalents but NOT identical.
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