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MARSTON GRB Graphite Disc Assemblies Bursting Discs The applications for these devices are as diverse as the industries that use them. The selection of the most suitable device can be critical: our extensive range provides the optimum solution. Bursting discs produced by Marston are batch tested in accordance with relevant British or other National and International standards and a certificate is supplied for each batch of discs. GRB Graphite Discs Assemblies are a Reverse Buckling Bursting Discs which offer extended service life, particularly within pressure cycling duties. A unique disc manufactured from pure graphite powder. It is suitable for high temperatures and extremely low bursting pressures. This disc will fragment on rupture.