Discussion
Most engineering polymers have heat distortion temperature (HDT) in excess of
Answer: D
Most engineering polymers have an HDT above 80°C.
The heat distortion (deflection) temperature is the temperature at which a standard bar deflects by a set amount under a set load. Engineering plastics such as nylons, polycarbonate, acetal, PBT and PET are expected to carry load at elevated service temperatures, and their HDTs typically range from about 80 to well over 100°C.
An HDT of only 0 or 20°C would mean a part could not bear load at room temperature, and -80°C is a glass transition region typical of rubbers, not engineering thermoplastics.
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