vatc17:
1.13cu+5.0pef+bonded al foil+0.12*64tc+6.9pvc
vatc19:
1.02cu+4.7pef+bonded al foil+0.12*64tc+6.7pvc
vatc21:
1.02cu+4.7pef+bonded al foil+0.12*48tc+pet al foil+0.12*64tc+7.5pvc