THERMAL PROPERTIES HEAT DISTORTION TEMPERATURE

HEAT DISTORTION TEMPERATURE (HDT) IS TESTED BY PLACING A TEST SAMPLE
(1/4” X 1/2” X 5”) IN AN ELECTRICALLY HEATED OIL BATH ACROSS A 4” SPAN. FIRST, THE INITIAL DEFLECTION IS RECORDED. A FORCE OF 264 PSI OR 64 PSI IS APPLIED TO THE CENTER OF THE REST BAR. THE OIL BATH IS RAISED 2 DEGREES PER MINUTE UNTIL AN ADDITIONAL 0.010” DEFLECTION IN THE CENTER OF THE TEST BAR IS RECORDED. HERE ARE SOME EXAMPLES:


MATERIAL TYPE HDT ( 64 ) HDT ( 264 )
ACETAL C 301 325
ACTEL / 25% GF C 331 325
NYLON 6 C 350 145
NYLON 6 / 10% GF C 410 375
NYLON 6 / 30% GF C 425 400
NYLON 6 / 40% GF C 425 420
NYLON 6 / 40% CF C 425 415
POLYESTER PBT C 338 293
PBT / 15% GF C 410 375
PBT / 30% GF C 416 405
PBT / 30% GF FR C 410 400
POLYCARBONATE A 285 270
PC / 10% GF A 300 295
PC / 30% GF A 305 300
PC / 30% CF A 305 300
POLYSULFONE A 330 345
PSUL / 10% GF A 350 360
PSUL / 30% GF A 370 360
PSUL / 40% GF A 380 365


CODE: A=amorphous; C=crystalline; GF=glass fibers; CF=carbon fibers;
all HDT values in degrees F.



CONCLUSION: Reinforcements like glass and carbon fibers will dramatically increase the HDT in crystalline resins and only moderately increase the HDT in amorphous resins.


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