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TBA Sealing Materials Ltd was asked to develop a suitable asbestos-free gasket sheet for these pumps and the resultant material, Permanite SF 3500, is now in use with major split case pump manufacturers.
Permanite SF 3500 owes its success to a blend of rigid and fibrillating fibres, a high quality polymeric binder and a reinforcing fiUer system. Specially formulated surface layers were also needed and the finished product was able to overcome the disadvantages suffered by exfoliated graphite, general purpose aramid sheet and beater sheet.
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The system is compatible with all major CAD languages so that gasket designs can be instantly loaded from customers' existing data files. Profiles are copied on a digitising board from templates or sample gaskets when CAD files do not exist. Alternatively, profiles can be programmed swiftly from dra
## Dynamic sealing 51 (BB)6 was its reinforcement contribution. Although the fibre itself has a high tensile strength, this strength can only be exploited in a gasket when a good attachment to the rubber matrix is achieved. To improve this, RF 51(BB)6 has been surface modified. Combined with acce