Clear Insulated Glass What is it? Clear Insulated Glass is also known as clear insulating glass/ clear double glazing glass/ clear IGU/ clear hollow glass. It is made of two or more clear tempered glass sheets or clear float glass sheets. The tempered clear insulated glass belongs to safety glass as the tempered glass’ special performance. As it’s clear high transparency, so this glass makes the room very bright and is widely used cold area. Performance Features - High transparency; - Strong soundproof; - Keep warm. Applications - Building inner window; - Blind window; - Outer glass wall.