... corrosion-resistance,weather-resistance,heat-resistance,alkali-resistance4. Technical standard:Chinese high precision standard GB5237-20081. Alloy and Temper: 6061-T4 ... ). Brush, d). Sand blasting , e). Anodized, f). Electrophoresis, g). Wooden gained, h). Powder coating, i). PVDF etc. curtain wall with top hung window