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Methods of measurement and calculation for determining fibre concentrations of man-made mineral fibres

Refactory ceramic fibre (RCF)
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97. RCFs are man-made vitreous (silicate) fibres with random orientation with alkaline oxide and alkali earth oxide (Na2O+K2O+CaO+MgO+BaO) content less or equal to 18% by weight. The term RCF also includes non-oxide ceramic fibre such as boron and silicon carbides and nitrides.