Aluminium Three Fold Sliding Folding Shutter Doors system permits the construction of three fold sliding folding doors. Aluminium: Hindalco extruded aluminium sections – in Alloy 6063 and Temper –T6. Conforms to IS: 733 and IS: 1285, Gaskets: All rubber gaskets are weather resistant (-40°C to +80°C) EPDM Gaskets.