... glass 3.sound insulation 4.Heat insulation thermal break sliding aluminum window Product description:1. Profile:aluminium alloy, 6063-T5.( ... , will not rust, rot, warp, or need constant finish maintenance. The aluminum frame will last for years and years, even as it ... sunlight, rain, wind, and snowstorms. or need constant finish maintenance. The aluminum frame will last for years and years, even as it ...