Explanatory notes
… other fused silica 7017.20 - Of other glass having a linear coefficient of expansion not exceeding 5 x 10 -6 per Kelvin … range of 0 °C to 300 °C 7017.90 - Other This heading covers glass articles of a kind in general use in … Woulf’s, etc.), special tubes (gas washing, drying, condensation, filter, gas burettes, test-tubes, etc.), …