China supplier hot sale good appearance pvc large glass windows on China WDMAProduct Details China supplier hot sale good appearance pvc large glass windows SP100 is a commerical system for windows and doors that boasts the optimum combination of safety and comfort. Fibreglass reinforced polyamide strips with ribs and or hollow chambers guarantee high thermal insulation levels. The system is available in a variety of aesthetic shapes to match the current architectural trends whilst offering all types of both inward and outward