This part of the European Standard specifies the conditions for determination of the linear density (mass per unit length) of ceramic multifilament tows, including among others silicon carbide, silicon nitride, silicon carbonitride, alumino-silicate, alumina and silicon oxide fibres. NOTE 1 When the determination of the linear density is carried out on sized multifilament tow, a correction should be made by calculation based on the size content. NOTE 2 Carbon fibres are not covered by this European Standard. ISO 1889 should be used for carbon fibres