177) which of the following metal is used in making electrical resistance wire for electric furnace and heating elements?
Related Engineering Materials MCQ with Answers
all of these
are formed into shape under heat and pressure and results in a permanently hard product
do not become hard with the application of heat and pressure and so chemical change occurs
formed by condensation polymerization
Thermosetting plastics are formed by condensation polymerization, whereas thermoplastics are plastic polymer substances formed by the addition polymerization process. Thermosetting plastics become permanently hard on the application of heat but do not soften on further heating.