Application of PC solid & flat sheet : Lighting roof of office buildings , shopping mails , hotels , villas , schools , hospitals , sports stadiums , recreational centers and public facilities . Skylights in green houses and indoor swimming pools . Sound-insulation walls in expressways , railways , and fly-over crossings in cities . Lighting materials of rob-poof counters in banks , displays of valuable exhibits and jewelers shops . The boards of lifht boxes , advertising display boards , Hot-formed products , Such as lighting shields and lamp shades , Police shields and windows of money-delivery vechicles , Explosion-resistance operations in factories , observance windows of explosion-resistance , the surface boards of automatic sales machines , headgears of motorcycles , all kinds of protective mask , Protect sheet etc .