... temperature resistance 4)clear solar concentrator glass lens(GT-TYN01/01/03) 1)material: optical glass(borosilicate),K9,BK7,B270 2) light ... ) main feature a: clear and transparent, no mould markd,no inside bubble and dirts b: can match up all kinds of ... dark c: adopt high precisy aspheric design and superior optical glass, strictly perform ROHS environmental standard 5) application range: suitable for ...