Semi-cured type felt is a combination of textile fibres, bonded by cured duro plastic phenolic resin or non phenolic resin, optional with flame retardant or expansible flame retardant agent to give a firm felt with rigidity and fire retardancy depending on the customer specified composition.

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Semi-cured felts are designed to be partially finished within the production stage leaving the moulding process to complete the resin activation and create the rigid shaped part. Due to this semi-finished state, semi-cured felts are soft and require the further cooking of a hot tool or hot oven.