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Civil Engineering - Building Materials - Discussion

Discussion Forum : Building Materials - Section 3 (Q.No. 33)
Building Materials
33.
Pick up the correct statement from the following:
Plastics have generally low melting point
The coefficient of thermal expansion of plastics is about three times than that of steel
The acoustical boards prepared by impregnating fibre-glass with phenolic resins has absorption coefficient of about 0.67
All the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
2 comments Page 1 of 1.
Swati said:   7 years ago
Anyone, please explain the answer in detail.
Usaf said:   8 years ago
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.
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