supply of non destructive testing penetrants, group i conforming to is 12889-1989 with non-aqueous wetdeveloper. packing : each set comprising three items in six cans in the ratio 1:2:3 the penetrant remover anddeveloper all in aerosol cans of 500 ml capacity each. the material content in each aerosol can should be 80 +/-3 by volume and the ratio of the product to the propellant 3:1 +/- 3.