Ultra Gold Flux Soldering Kit

Ultra Gold Flux Soldering Kit

Ultra Gold Flux is engineered for low-temperature soldering of aluminum, copper, and stainless steel. As a result, it delivers strong fluxing action between 350–550 °F (177–288 °C), while also penetrating tight joints and stranded wire for reliable bonding. Moreover, unlike generic fluxes, this formula is golden, chloride-free, and organic-based, which means it contains 56–60% active ingredients for superior wetting and conductivity.

This kit combines Ultra Gold Flux with KA09 solder alloy, ensuring they work together seamlessly. Specifically, the KA09 solder is a 91% Tin / 9% Zinc (91Sn/9Zn) alloy with a 0.062″ (1/16″) diameter. Consequently, it creates strong, conductive, and durable joints while also maintaining low electrical resistance.

Generic solders or fluxes simply won’t wet aluminum properly. Therefore, using this flux with KA09 solder ensures the correct pairing needed for speaker voice coil repair, electronics, RC models, and general aluminum bonding. Furthermore, this combination reduces the risk of failed joints, which is common when the wrong flux or solder is used. In addition, the solder flows smoothly and offers excellent capillary action, so it is ideal for tight joints or stranded wire connections.

Applications:

• Voice coil and subwoofer lead soldering

• Aluminum-to-aluminum and aluminum-to-copper splices

• Terminals and brass/plated connections

• Hot dip coating of aluminum connectors for low-resistance contact

• RC models, electronics, and household repairs

• Automotive and marine wiring repairs

Key Features:

• Flux active range: 350–550 °F (177–288 °C)

• Golden, chloride-free, organic-based liquid flux

• KA09 solder alloy: 91% Tin / 9% Zinc (91Sn/9Zn), 0.062″ diameter

• Strong, conductive, and durable joints

• Excellent capillary action for tight fits

• Residue is conductive/corrosive — clean with hot water or alcohol

• Shelf life: 2 years unopened

Important Notes:

• Do not overheat — flux chars above 550 °F.

• Always use with KA09 solder for best results; other alloys will not perform properly.

• In addition, the kit is offered in multiple sizes: 0.25 oz, 0.5 oz, 1 oz, and 2 oz bottles. This way, you can choose the right amount for either small projects or larger production runs.