1.3 layers PC sheet Features: color-stable, fireproof, and durable 2.material:pc 3.thickness:4mm to 14mm 4 ... .good transmission 3 layers PC sheet Application: general construction material processskylights of skyscrapers, ... greenhouses, factories, garagesbulletin boards, shop sings, and indicatorsceilings, light and lamp covers, shower stall doors, and skylights of ...