Castolin 18 - Flux

Castolin 18

Castolin 18 is a paste-like flux made from a mixture of alkali borates and boric acid, which is intended for brazing copper and ferrous metals.

Technical data
EN 1045: FH 21

Product color: yellow
Effective temperature range: 700 - 1,000 °C
pH: 7 - 8
Density: 1.4

Applications
It can be used with all copper- and zinc-based filler metals, especially with the following alloys:

CASTOLIN 18 - 18 F - 18 XFC - 185

Castolin 18 is suitable for bonding copper and ferrous metals. It is especially recommended for galvanized steels.

Processing instructions
Preparation

• If necessary, clean the joints and the surfaces to be joined. Round off sharp edges and degrease the parts with a suitable solvent.
• Coat the surfaces with CASTOLIN Flux 18 using a brush. The flux promotes the wetting of the filler metal on the base metal. It can also be used as an indicator for the joint temperature.
• Heat locally to the melting point of the flux.
• Melt the end of the filler metal rod pre-coated with flux and apply to the joint. Allow the drops to bond to the base metal.
• Spread the drops with a continuous flame movement. The filler metal is thus applied using a continuous dripping and melting technique.
• Do not overheat.

Cleaning

• The flux residues are not corrosive and can be left in place after soldering.
• If cleaning is required, use a mechanical cleaning method: Sanding, grinding, scraping, etc.

Delivery form
Packaging: Plastic bottle 1 kg.