Mineral fibre prepreg with long storage life, useful for filling vehicle silencer
摘要
A mineral fibre product is treated with an aqueous solution of a curable, methanol-etherified melamine-formaldehyde precondensate (I) as uncured semifinished product with long storage life. (I) is 60-90% etherified and is a reaction product of 1 mole melamine with at least 5 moles formaldehyde and at least 3 moles methanol.