Alu-flo™ Filler Metals

Alu-flo™ HT is the industry standard product for joining aluminium and is used for manufacturing HVAC&R components from aluminium alloys. Aluminium alloys from the 3000 and 6000 ranges may be joined successfully with this product. Alu-flo™ No.1 or Alu-flo™ No.2 Flux Paste should be used with solid forms of Alu-flo™ HT but are not necessary with product forms containing flux such as a braze paste, a flux cored wire or strip with flux encapsulated into a central channel.
AMS/AWS A5.8
BAlSi-4

EN1044:1999
AL104

Alu-flo™ MT is less commonly used than Alu-flo™ HT and consequently is available in fewer product forms. It may be used for manufacturing components from the 3000 and 6000 ranges of aluminium alloys where there is a requirement to braze at a lower temperature than that of Alu-flo™ HT. Alu-flo™ No.1 or Alu-flo™ No.2 Flux Paste should be used with Alu-flo™ MT.
AMS/AWS A5.8
BAlSi-3

EN1044:1999
AL201

Alu-flo™ ZA-1 is a zinc–aluminium filler metal that can be used as a product for repair of aluminium components or for joining non-critical parts. It has also been used for HVAC&R joints. However, it should be noted that Alu-flo™ ZA-1 joints can exhibit shrinkage gaps formed on cooling and galvanic corrosion when joining copper to aluminium. Consequently special consideration should be given before selecting it. This product is available as a flux cored wire or strip with flux encapsulated into a central channel.

Alu-flo™ LT is a high melting point solder used for HVAC&R components from aluminium alloys. It should be used with Alu-flo™ No.3 Flux Paste however because the flux is not active until approximately 35˚C above the liquidus of Alu-flo™ LT care should be taken to avoid erosion of the parent metals by the molten solder. For this reason use of this solder is often limited to hand feeding wire or rod into joints. Alu-flo™ LT may be used for copper to aluminium transition joints in HVAC&R applications.