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GRS manufacture a range of Foamed and Non-Foamed Tyre Mould casting plasters under the Hydracast brand name. These plasters were developed for the casting of aluminium alloys using the permanent mould process. Hydracast Tyre Mould formulations have been specifically formulated to give high dimensional accuracy, excellent surface finish and high permeability. GRS have the ability to supply a ready formulated product or formulate a bespoke product to meet your needs