... its liquidity and permeability are stronger than other similar flux.QJ201 uniform particles for subtle, melting point about 420 °C, ... alloy.Main ingredients are alkali metal ,alkalineearths ,fluoride and activator.QJ401 Aluminum brazing solvent melting point about 550°C, suitable for ... Its performance in high temperature more superior in aluminum soldering QJ201. high quanlity Aluminium welding powder
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