... 190*80mm Glass block is made by glass sand, soda ash, quartz pow Glass BlockWe are the supplier of glass block ... Jiangxi province.Glass block is made by glass sand, soda ash, quartz powder & other silicate which melted in high temperature. ... decorated in the room or outside. GlassComposition : Silica-sand, soda ash, calcium.Fusion is obtained at approximately 1550OC. Light TransmissionClear 190x190x80 ...