Heat Transfer on Chemistry related Questions and Answers

Question :   Which of the following is the most widely used heat insulating material for pipelines carrying steam ? 1. Fireclay refractory followed by aluminium sheet. 2. Tar dolomite bricks followed by asbestos. 3. Cotton followed by aluminium foil. 4. 85% magnesia cement and glass wool. Answer :   4 - 85% magnesia cement and glass wool.