Pick up the correct statement from the following:
1.The percentage of absorption for firebricks varies from 5 to 10
2.The percentage of silica in silica bricks is to the extent of about 95 to 97 percent
3.Roughly 1 to 2 percent of lime in silica bricks is added to act as binding material
4.All the above.
Posted Date:-2021-03-26 00:40:44