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Doc. Ref. <br />Issue <br />date <br />Issue <br />Status <br />Page No. <br />Complied by: <br />Authorised by: <br />TDS9 <br />22/1/00 <br />1 <br />1 of 1 <br />D Holmes <br />J R Newton <br />-•. •All. , <br />:101 D11164 d r -E, 7•1 11 1 11 111 1 1 111 F_ <br />7MLOIZ11 5,51111 1111111771 'MIT <br />MATERIAL % BY WEIGHT % FVF <br />E - glass fibre 39 20 <br />Isoohalic oolvester resin 61 <br />Structural Integrity: <br />The chamber was subjected to a structural vacuum test and the rate of chamber wall <br />deflection was recorded. The chamber is vacuum testable to a burial depth of 3 metres. <br />Vacuum (mbar) <br />Equivalent head <br />of water m) <br />Deflection <br />mm <br />60 <br />0.6 <br />0.2 <br />120 <br />1.2 <br />0.4 <br />180 <br />1.8 <br />0.65 <br />240 <br />2.4 <br />1.05 <br />300 <br />3 <br />1.35 <br />Surface resistivity: <br />Independent test authorities (British Standards Institute and Electrical Research <br />Authority) have established that in order to prevent a build up of static electricity the <br />surface resisitivity must be less than 1 M/cm2. <br />Although, there are no specific test criteria for composite access chambers, Fibrelite's <br />access covers have been tested by BSI and comply with the requirements of BS 2050: <br />Appendix A 4.1. Due to the fact that the manufacturing process is the same for both <br />components, and that the surface material used to achieve the anti -static properties on <br />the cover is used on the chamber. We can therefore verify that both the cover and <br />chamber comply with the specified requirements of BS 2050: Appendix A 4.1. <br />Chemical resistance: <br />The resin system used to manufacture access covers is also used to manufacture <br />access chambers. Therefore, the results obtained for the access cover (compliance to <br />BS 903: Part A18) will also apply to the access chamber. <br />