Civil Engineering - Building Materials - Discussion

33. 

Pick up the correct statement from the following:

[A]. Plastics have generally low melting point
[B]. The coefficient of thermal expansion of plastics is about three times than that of steel
[C]. The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67
[D]. All the above.

Answer: Option D

Explanation:

No answer description available for this question.

Usaf said: (Apr 7, 2018)  
PVC (polyvinyl chloride, don't melt this one, its toxic) melts at about 160 degrees C.

HDPE (High-Density Poly Ethelene) 120-180°C.
MDPE (Medium Density Poly Ethelene) 120-180°C.
LDPE (Low-Density Poly Ethylene) 105-115°C.
PET(E) (polyethylene terephthalate,don't melt toxic) 250-250°C.
PP (poly Propylene VARIES) 130°,160°,170°C.
PS (Poly Styrene,don't melt,toxic) 240°C.
PLA (Poly Lactic Acid, biodegradable plant plastic) 173-178°C.

Swati said: (Mar 1, 2019)  
Anyone, please explain the answer in detail.

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