Length:1-4mm,5-8mm color:grey,white Main use: brake block ... -360,A4-30,A5-70,A5-60 Used: heat resistant , asbestos sheet asbestos1. Analysis : Item No.6-40,5-50,5-60 ... )Mohs hardness scale6Maximum Operation Temperature1450Area of OriginHeBei province 2. Feature: 1) Main chemical content is SiO2, MgO, crystal water etc.2 ...