Eyre No 7 Aluminium Soldering Flux is an organic flux which on decomposition at a temperature a little below the jointing temperature of approx. 316C (600F) removes the refractory oxide from the strand of the core and makes the surface receptible of solder. Because of the low specific gravity of the flux residues they are replaced by the solder forming a sound metal to metal contact. It possesses an added advantage over the inorganic type reaction fluxes and welding techniques inasmuch as the soldering temperature can be maintained as low as 316C (600F) thus avoiding damage to the paper impregnation and the insulation.