UNITS | ASTM TEST | HOMOPOLYMER ACETAL | COPOLYMER ACETAL | TECAFORM® HPV13 PTFE-FILLED ACETAL | 20% GLASS FIBER FILLED HOMOPOLYMER ACETAL | |
Tensile strength | psi | D638 | 10,000 | 9,800 | 6,800 | 8,500 |
Flexural modulus | psi | D790 | 420,000 | 370,000 | 350,000 | 730,000 |
Izod impact (notched) | ft-lbs/in of notch | D256 | 1.5 | 1.0 | 0.7 | 0.8 |
Heat deflection temperature @ 264 psi | °F | D648 | 257 | 230 | 244 | 316 |
Maximum continuous service temperature in air | °F | 185 | 195 | 185 | 185 | |
Water absorption (immersion 24 hours) | % | D570 | 0.25 | 0.20 | 0.22 | 0.25 |
Coefficient of linear thermal expansion | in/in/ °Fx10-5 | D696 | 6.8 | 6.1 | 5.1 | 2.0 - 4.5 |
Coefficient of friction (dynamic) | 0.20 | 0.21 | 0.12 | 0.35 |