uPVC Windows

uPVC (Unplasticised Polyvinyl Chloride) windows are window frames made from rigid PVC profiles, replacing traditional aluminium and wooden frames. Per IS 12027:2014 (specifications for uPVC windows), uPVC offers advantages: (1) Corrosion-resistant (no rust); (2) Thermal insulating (reduces HVAC load); (3) Dimensionally stable; (4) Low maintenance; (5) Energy-efficient. Major Indian uPVC window manufacturers: Veka, Fenesta, Eternia, Aluplast, NCL Industries, Reynaers India.

Properties: (1) Density 1300-1450 kg/m³. (2) Tensile strength 40-50 MPa. (3) Thermal conductivity 0.16 W/mK (vs 200 for aluminium — much better insulator). (4) Sound reduction Rw 30-40 dB depending on glazing. (5) Service life 30-50 years (vs 15-20 for aluminium painted). Applications: (1) Residential window frames — modern apartment buildings, individual homes. (2) Commercial offices — energy-efficient buildings (ECBC compliance). (3) Hotels and hospitality — premium aesthetic. (4) Industrial buildings — corrosion-resistant. Cost premium 25-50% over aluminium frames; offset by HVAC energy savings.

Design considerations: (a) Profile selection — varies in thickness and chamber count for thermal performance. (b) Glazing — single, double (DGU), triple (TGU). DGU 28-32 mm overall provides U-value 1.5-2.5 W/m²K, vs 5+ W/m²K for single glazing. (c) Hardware — steel-reinforced for security. (d) Sealing — silicon or polyurethane gaskets at perimeter. (e) Drainage holes for water removal from frame interior. The most-overlooked aspect of Indian uPVC adoption: installation. uPVC requires precision installation; gaps between frame and wall must be sealed with foam + silicon. Cheap installation creates air leakage that defeats the energy efficiency advantage.