Orientated PET is made by stretching PET sheet after extruding the material into a sheet. It is semicrystalline thermoplastic polyester derived from polyethylene terephthalate. Mylar is cloudy in appearance while Melinex is clear. Its excellent wear resistance, low coefficient of friction, high flexural modulus, and superior dimensional stability make it a versatile material for designing mechanical and electro-mechanical parts. Available only up to .014 inch thick it is widely used where designers need
- Excellent wear resistance
- Low coefficient of friction
- Very good chemical resistance
- Good electrical insulator
- High mechanical strength
- Excellent hardness and stiffness
- Low water absorption
- Good resistance to high-energy radiation
| Properties | Condition | Value | Test Method | Comment | ||
|---|---|---|---|---|---|---|
| Mechanical | Modulus of elasticity (tensile test) | 470,000 | psi | ASTM D 638 | ||
| Tensile strength at yield | @ 73°F | 13000 | psi | ASTM D 638 | ||
| Elongation at break | @ 73°F | 20 | % | ASTM D 638 | ||
| Flexural strength | @ 73°F | 19000 | psi | ASTM D 790 | ||
| Modulus of elasticity (flexural test) | @ 73°F | 500,000 | psi | ASTM D 790 | ||
| Impact strength (Izod) | @ 73°F | 0.70 | ft-lbs/in | ASTM D 256 | ||
| Rockwell hardness | M Scale, @ 73°F | 101 | ASTM D 785 | |||
| Coefficient of friction | Dynamic, 40 psi, 50 fpm | 0.25 | % | ASTM D 3702 1) | 1) Injection molded specimen | |
| Coefficient of friction | Static | 0.19 | % | ASTM D 3702 1) | ||
| Wear rate | Against Steel, 40 psi, 50 fpm | 210*10-10 | in3-min/ft-lbs-hr | ASTM D 3702 1) | ||
| Thermal | Melting temperature | 490 | °F | 2) | 2) Per ASTM D3418 | |
| Heat distortion temperature | @ 264 psi | 175 | °F | ASTM D 648 | ||
| Heat distortion temperature | @ 66 psi | 240 | °F | ASTM D 648 | ||
| Service temperature | Long Term | 230 | °F | – | ||
| Service temperature | Intermittent | 320 | °F | – | ||
| Thermal expansion (CLTE) | 3.9*105 | in/in/°F | ASTM D 696 | |||
| Specific heat | 0.28 | BTU/ln-F° | – | |||
| Thermal conductivity | 2.01 | BTU-in/hr-ft2-°F | – | |||
| Electrical | Volume resistivity | 1015 | Ω*cm | ASTM D 257 3) | 3) Injection molded specimen | |
| Dielectric strength | 400 | V/mil | ASTM D 149 3) | |||
| Dissipation factor | @ 60 Hz, 73°F | 0.002 | % | ASTM D 150 3) | ||
| Dielectric constant | @ 60 Hz, 73°F, 50% RH | 3.4 | % | ASTM D 150 3) | ||
| Other | Moisture absorption | @ 24 hours, 73°F | 0.10 | % | ASTM D 570 | |
| Moisture absorption | @ saturation, 73°F | 0.50 | % | ASTM D 570 | ||
| Flammability (UL94) | HB | % | 4) | 4) Estimated | ||
| This information is only to assist and advise you on current technical knowledge and is given without obligation or liability. All trade and patent rights should be observed. All rights reserved. Data obtained from extruded shapes material. | ||||||