Masterflux Scalemaster Heat Activated Flux (White) 80g - 700021

The Scalemaster Masterflux 700021 is an 80 g tub of heat-activated soldering flux designed for use with copper pipework and fittings in domestic and commercial plumbing systems. This WRAS-approved, water-washable flux is lead-free and non-acidic, ensuring safe use with potable water. Its white paste formulation activates only when heated, allowing clean assembly with minimal residue, and provides excellent wetting and capillary flow for strong, leak-proof solder joints.

• Heat-activated flux – activates on contact with soldering heat for clean joints
• WRAS approved – safe for use with potable water installations
• Lead-free and non-acidic – reduces corrosion risk during soldering
• Suitable for copper pipework and fittings in plumbing and heating systems
• Easy to apply – white paste in resealable tub
• Water-washable – leaves minimal residue post-solder