Soldering Bellows - Flux

Discussion in 'Plumbers' Talk' started by Jimbo, Jul 22, 2020.

  1. Jimbo

    Jimbo Screwfix Select

    Got some expansion joints, stainless steed bellows with copper tails. What flux should I use to solder them?

    Manufacturer data sheet states:

    "When using soldered capillary fittings, do not over-heat. Shield the bellows from excessive heat. Most fluxes are chloride based and will attack stainless steel, best to use a phosphoric acid based flux. Clean off all residual flux."

    I currently use LACO regular soldering flux paste, which states "contains no zinc chloride to reduce corrosion concerns" - but doesn't list stainless steel specifically as suitable.
  2. timotay

    timotay Active Member

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