... 2.glass:double glass 3.sound insulation 4.Heat insulation thermal break sliding aluminum window Product description:1. Profile:aluminium ... alloy, 6063-T5.(Chinese Top Brand aluminum profile) ,with thermal break systerm. 2. Profile thickness: 1.6mm3. Surface treatment: ... .sound insulation,with double glass,5.heat insulation,with thermal break material6.Water proof,with special bottom track,and ...