In PVC the corner joints are welded with Fusion welding. Each profile has to have certain corner strength as per the standard. As long as these values of met, there is no need for reinforcement. Class A & B profiles will always have better corner strength. Since PVC is welded there is no need for mechanical joint. Anyway Steel can not be welded at the same time. Sometimes if the weight of frame (e.g. Lift & Slide) is too much then you may connect the corners mechanically in addition to welded joint.

PVC alone can not withstand the load of wind, dynamic movement etc. When the wind load calculations are done for the uPVC windows AIS
considers Modulus of Elasticity (E value) of steel & of PVC both.

PVC has Vicat softening temperature of 78 to 82 deg. C after which its molecular structure starts degrading. After this point the profile will loose its shape resulting in failure of window. PVC starts to decompose when the temperature reaches 140 °C, with melting temperature
starting around 160 °C. The linear expansion coefficient of rigid PVC is small and has good flame retardancy, the Limiting oxygen index (LOI) being up to 45 or more.

Design in accordance with International standards. Widest variety of profiles. Casements have niche for drainage slots. Sliding frames has
slope for effective drainage of water. Uses EPDM gaskets which have best insulation properties compared to other gasket materials.

The ‘u’ in uPVC stands for unplasticised and means that the material used has not been softened by additional chemicals known as
plasticisers. Also virgin/ fresh pvc used, Commonly called Rigid.

AIS uPVC is according to international standards. Consistent quality. Tropical material composition suitable for India.