... Windows & doors in china.The window systems we designed meet the performance requirement of air tightness, water tightness, wind resistance, thermal and ... last performance,thermal and sound insulation,low maintance,water tightness,air tightness.As for PVC extrusion profile,We have passed ISO9001 ... test.1) Specification: 60/70/80/88/115/130 casement/sliding.2) Colors: White, Tan.3) Good quality with ...