Abstract: The present invention relates to a surface treating dispersion for treating a surface of zinc or of an alloy of zinc and aluminum, the surface treating dispersion comprising an aqueous solution having a pH of below 3 and a complex formed from at least one species of metal oxo ion in conjunction with at least one species of hetero ion, the metal oxo ion being selected from the group consisting of molybdate, tungstate and vanadate, the hetero ion being selected from the group consisting of phosphorus (V), aluminum (III), silicon (IV), manganese (II), manganese (IV), zirconium (IV), titanium (IV), tin (IV), cerium (III) and nickel (II); and with a film forming acid tolerant resin compatible with the selected ions.

Abstract: The invention relates to oil resistant signal tube, in particular, to initiating explosives or explosives accessories which comprise signal tube. The signal tube of the invention has a sub-tube comprising polyethylene and an outer jacket comprising a thermoplastic polyurethane resin of the polyester type.