... watertight and air permeation resistance. Feature: Elegant style, open inward, Window closed: Good watertight and air permeation resistance. Economic and reasonable ... thickness at 12um) etc Glass: Double or triple glass(tempered glass, figure glas, frosted glas, coated glass, low-e glass, tinted glass etc) Hardware: Tilt-turn ... channel) Sealant: EPDM, PVC, SILICONE ETC aluminum tilt&turn window