Fully cured type felt is a combination of textile fibers, bonded by cured duro plastic non phenolic resin, with flame retardant or expansible flame retardant agent to give a firm felt with rigidity and fire retardancy.  

Semi cured type felt is a combination of textile fibers, by duro plastic non phenolic resin, with flame retardant or expansible flame retardant agent to give a firm felt with rigidity and fire retardancy.