DS EN 2331:1993 Aerospace Series - Textile Glass Fibre Preimpregnates - Test Method For The Determination Of The Resin And Fibre Content And Mass Of Fibre Per Unit Area Defines a method for determining the resin content, (with or without volatiles), fibre content and mass of fibre per unit area of a textile glass fibre preimpregnate by ignition or solvent extraction,