3815 1910 00

3815191000

Catalyst in the form of grains of which 90|% or more by weight have a particle-size not exceeding 10|micrometres, consisting of a mixture of oxides on a magnesium-silicate support, containing by weight: -|20|% or more but not more than 35|% of copper and -|2|% or more but not more than 3|% of bismuth, and of an apparent specific gravity of 0,2|or more but not exceeding 1,0