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Vacuum Breach Units These two part metallic units are positioned in the vacuum bag and provide a pathway for air to be removed once the vacuum bag has been sealed. The male thread of the top part of the unit is designed to allow a clean hole to be cut in the vacuum bag. The top part is inserted into the hole in the base part of the unit and tightened. This automatically cuts a hole in the vacuum bag. The resulting disc of film can be removed by unscrewing the unit before re-positioning and tightening the two parts together again. A silicone washer ensures an air tight seal is achieved. Vacuum Hoses Our high strength, high temperature silicone hoses are designed for both oven and autoclave applications. They are fitted with an internal reinforcing spring to prevent the hose collapsing at high autoclave pressures. An additional benefit with these hoses is that in the event of damage, they are quickly and easily repairable at the customers own premises. Vacuum Gauge It is imperative that once the vacuum has been applied and all the air is evacuated from the bag, the vacuum level is checked. This is achieved by using a vacuum gauge. The hose and non-return socket are disconnected and replaced with the vacuum gauge, also fitted with a non-return socket (Fig 11). If the needle indicator on the gauge descends, there is a leak somewhere in the bag and this will require sealing. Areas to check are the tightness of the fastening of the vacuum port or leak paths between the sealant tape and the vacuum bagging film. If leaks are not adequately dealt with, the quality of the finished product will be seriously compromised. An ultrasonic leak detector is available in our range to assist in locating leaks. Silicone Vacuum Bagging Aid Solvay’s silicone rubber vacuum bag aid INTENSIFLEX is designed to reduce potential vacuum bag failures caused by sharp edges and open areas in the glass laminate. INTENSIFLEX is a 12mm (0.5in) thick uncured silicone rubber sheet that easily molds to the geometry of the glass laminate features simplifying the vacuum bagging operation. INTENSIFLEX is cured at 90°C (194°F) and can be re-used several times making this unique product a cost effective solution for solving vacuum bag failures. Figures 8-9. Sealant tape attached to the vacuum film. Release paper should be left in place until ready to complete the bagging process. Note that the lower part of the vacuum breach unit must be positioned inside prior to sealing the bag. 6 / Glass LaminationPDF Image | Glass Laminates COMPOSITE MATERIALS
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