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MARSTON Insert Type Bursting Discs Generally, holders will be manufactured from stainless steel, though other materials can be supplied when required. Holders are normally non-torque sensitive. Marston provide holders specifically designed for each disc type, and to fit the particular application. Usually the holder will be an insert type; one that fits within the flange bolt circle. This provides an easier method of fitting replacement bursting discs since fewer flange bolts need to be removed. Holders usually consist of two annular rings that provide a flat sealing flange for the bursting disc. Consequently, the performance of the disc should be unaffected by excessive flange bolt loading. (Certain graphite assemblies require close control of the flange bolt torque.) Most holders are supplied with assembly screws. These can be simply to hold the assembly together whilst fitting onto the plant.