Building Materials
In the method of condensation polymerization,

All of these
Low-molecular substances are removed from the high molecular substance
The reaction proceeds with an evolution of hydrogen chloride
The reaction proceeds with an evolution of ammonia

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Building Materials
The thermosetting plastic

Becomes rigid when moulded at suitable pressure and temperature
All listed here
At 127°C to 177°C permanently set and further application of heat does not soften it
Chars at 343°C

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