Looking for High-Performance Plastic Components?
PET (polyethylenetarapthalate) is an engineering thermoplastic polyester that provides excellent strength and stiffness. It has slightly higher chemical resistance than that of the acetal family of thermoplastics. It too is easily machined with conventional metal working equipment and can be held to very close tolerances with experience. Both sheet and rod are available in many thicknesses and diameters. Rod stock comes ground to diameter to accommodate through spindle turning. Standard colors are black and (opaque) milk white, while custom colors are available as custom runs.
PET (Thermoplastic Polyester) is non hygroscopic and is FDA compliant. It absorbs minimal amounts of moisture and can be cleaned easily. As a result, it finds applications in high moisture, food handling, medical and marine components.
Although it has many benefits as an unfilled material, PET can be filled with solid lubricants to enhance its bearing and wear properties. Materials such as PTFE Teflon and is available in some standard sizes.
| Specification | Test | Value | Units |
| Specific Gravity, 73°F | D792 | 1.41 | - |
| Tensile Strength @ Yield, 73°F | D638 | 12,400 | psi |
| Tensile Modulus of Elasticity, 73°F | D638 | 460,000 | psi |
| Tensile Elongation (at break), 73°F | D638 | 20 | % |
| Flexural Strength, 73°F | D790 | 18,000 | psi |
| Flexural Modulus of Elasticity | D790 | 490,000 | psi |
| Shear Strength, 73°F | D732 | 8,000 | psi |
| Compressive Strength - Ultimate | 10,000 | psi | |
| Compressive Strength at 2% Deformation | D695 | 12,000 | psi |
| Compressive Strength at 10% Deformation | D695 | 15,000 | psi |
| Deformation Under Load | % | ||
| Compressive Modulus of Elasticity, 73°F | D695 | 420,000 | |
| Compressive Strength ⊥ to Laminate (Modulus) | psi | ||
| Compressive Strength ⊥ to Laminate (Yield) | 10,000 | psi | |
| Compressive Strength ⊥ to Laminate (Ultimate) | 10,000 | psi | |
| Hardness, Durometer (Shore "D" scale) | D2240 | D87 | |
| Hardness, Rockwell (Scale as noted) | D785 | M93(R125) | Rockwell M |
| Izod Impact, Notched @ 73°F | D256 Type A | 0.5 | ft.lbs/in. of notch |
| Coefficient of Friction (Dry vs Steel) Static | PTM 55007 | 0.25 | |
| Coefficient of Friction (Dry vs Steel) Dynamic | PTM 55007 | 0.20 | |
| Maximum Static Bearing Load (P) | PTM 55007 | 10,000 | psi |
| Maximum Unlubricated No Load Bearing Velocity (V) | PTM 55007 | 15 | ft/minute |
| Maximum Limiting PV (Unlubricated) | PTM 55007 | 2,800 | psi x ft/min. |
| Wear Factor "K" x 10-10 | PTM 55010 | 60 | Cubic in.-min/ft.lbs.hr |
| Sand Wheel Wear/Abrasion Test | 50 | UHMW=100 | |
| Minimum Mating Surface Hardness | 20 | Rockwell (Brinnell) | |
| Coefficient of Linear Thermal Expansion | E-831 (TMA) | 3.3 | in/in/°F x 10-5 |
| Coefficient of Thermal Expansion // to Laminates | E-831 (TMA) | 3.3 | in/in/°F x 10-5 |
| Coefficient of Thermal Expansion I to Laminates | E-831 (TMA) | 3.3 | in/in/°F x 10-5 |
| Softening Point | 240 | °F | |
| Heat Deflection Temperature 264 psi | D648 | 240 | °F |
| Embrittlement Temperature | °F Min. | ||
| Continuous Service Temperature in Air | 210 | °F Max. | |
| Short Term Service Temperature | 210 | °F Max. | |
| Tg-Glass Transition (Amorphous) | D3418 | °F | |
| Melting Point (Crystalline) Peak | D3418 | 491 | °F |
| Thermal Conductivity | F433 | 2.0 | BTU-in/(hr/ft2°F) |
| Dielectric Strength Short Term | D149 | 385 | Volts/mil |
| Volume Resistivity | D257 | >1013 | ohm/cm |
| Surface Resistivity | D257 | ohm/cm | |
| Dielectric Constant, 106 Hz | D150 | 3.4 | |
| Dissipation Factor, 106 Hz | D150 | .02 | |
| Flammability @ 3.1mm(1/8 in.) UL94 | UL94 | HB | |
| Arc Resistance | seconds | ||
| Water Absorption, Immersion 24 Hours | D570 (2) | 0.07 | % |
| Water Absorption, Immersion Saturation | D570 (2) | 0.9 | % |
| Machinability Rating | 1 | 1=easy, 10=difficult | |
| Rod Diameter Availability (Off the Shelf) | .250 | 6.0 | inches |
| Sheet Thickness Availability (Off the Shelf) | .250 | 3.0 | inches |