Techniflex THB for Glazing uPVC Door Panels
Techniflex THB for Glazing uPVC Door Panels
Double sided tapes are widely used for bonding the double glazed window unit to the door skin.
DoorIn the past a common problem particularly with woodgrain effect door panels has been caused by thermal expansion. Due to the dark colouration of the panel the door tends to absorb the energy from the sunlight rather than reflect it like a white door. This results in the woodgrain effect panel heating up. The build up of heat in the door causes the external skin to expand. The internal door skin generally remains cool, due to the high thermal insulation properties of the foam and wood core of the door. The differing rates of thermal expansion between the internal and external door skins results in the door warping and bowing. As the double glazed unit is rigid, it will not flex with the door skins it is bonded to when the door warps. This exerts a significant peel force on the adhesive tape. If the distance between the glass and the door skin increases beyond the thickness of the tape, the tape will peel away from either the glass or the door skin (see figure 1) resulting in possible water ingress.