Features: 1) Can block the transmission of the radiant heat in tropical zone to keep the interior cool 2) On the other hand, in frigid zone, it allows solar heat and light to pass through the glass into the building and blocks heat from leaving the room, reducing heat loss considerably 3) The vacuum sputtering process coats glass surfaces with several layers of different materials 4) Among these, a silver layer effectively reflects infrared rays while maintaining excellent thermal performance 5) Beneath the silver layer is an anti-reflective thin oxide base layer that increases the transparency of the glass 6) Above the silver layer is an isolating nickel-chromium (NiCr) alloy coating 7) The main function of the top anti-reflective thin oxide (SnO2) layer is to protect the other coating layers