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Double Glazing

Double Glazing Components / Pressure Control Capillary Breather Tubes Capillary breather tubes are a pressure regulation device that allows the pressure inside an insulated glass unit to be equalised with atmospheric pressure. The tubes are developed for IG units that are exposed to continuous pressure changes as a result of variations in barometric pressure, altitude, or temperature. Usage Capillary breather tubes should be used if there is a difference of 610m in elevation between the final destination of the double glazed unit and where the unit is manufactured OR if the transport of the unit will result in a change of elevation over 1220m. Typically one capillary tube is installed in an IG unit by sliding the capillary tube alongside a corner key into a spacer, or by inserting the capillary tube through a hole punched in the spacer. Sealant is then applied around the capillary tube, and typically the entire unit. Why is it needed? When pressure increases and temperature decreases this will cause a sealed unit to bow inward, whereas pressure decreases and temperature increases will cause units to bow outwards. The bowing causes visual distortion and can in some cases lead to glass fracture and/or edge seal failure. Features • Automatically allows air to flow in or out of the unit thus regulating the pressure • Maintains proper air space thickness resulting in higher insulating value of the IG unit • Reduce risk of visual distortion, seal stress and glass fracture • Not suitable for use in gas-filled units • Quick and easy to install Size: 0.5mm diameter x 300mm long 104 Product Catalogue For Glass Processors & IG Manufacturers

Double Glazing Components / Pressure Control Two-Way Valve The two-way valve is a pressure regulation device that allows an adjustment between the inner and outer pressure of an insulated glass unit. The valve is developed for IG units that are exposed to continuous pressure changes as a result of variations in barometric pressure, altitude, or temperature. Usage The two-way valve has been developed to improve the reliability of insulated glass units by solving the common problem of excessive pressure differences putting an insulated glass unit under stress and causing damage such as cracks in the glass or loosening of the sealant. The valve is inserted through a 6mm hole in the spacer frame. Once the insulating glass unit is sealed, the valve is usually cut at the secondary seal and closed with the supplied plug. The valve is equipped with a silicone tube compatible with JS562. How It Works Under normal conditions the valve remains closed without letting air in or out of the unit. When the difference between inner and outer pressure exceeds a range of ± 80 millibar the valve opens, allowing an adjustment in pressure. When the variation reaches a range of ± 25 millibar, the valve shuts and the unit is completely sealed again. The “two-way” valve does not perfectly balance the I.G. unit pressure, it only allows an adjustment between inner and outer pressure. Features • Opens automatically when pressure differential exceeds range of ± 80 millibar • Can be installed in all kinds of spacer bars with a minimum width of 9.5mm • Most effective in gas-filled units but cannot be used as a gas-filling hole • Reduces the risk of visual distortion, seal stress and glass fracture Size: Available with 6.5mm or 8mm collared bush depending on spacer size. Colour: Available in both clear and black. Email: info@fgtrading.co.za | Web: www.fgtrading.co.za 105