RG50/230 White Foam Sheet. RG50/230 is a very firm foam, suitable for various upholstery applications, especially in very high usage areas. Can be used for firm seat cushions, arm wraps, in contract upholstery for a firm seat base. Well suited for very severe use such as theatre & cinema seating, also automotive seating in the transport industry. Can be used on it’s own for a firm seat base, or with a softer foam over the top for added comfort.