Lastek 38 B

Very thin flowing silver alloy

Recommended for joining all non-ferrous metals, except nickel and aluminium.

Requires no flux on copper, eliminating cleaning problems after brazing.

On brass and bronze, to be used with flux.

Do not use on steel.

Specifications & Usage


Brazing of electrical contacts.

Soldering of copper tubes, cold and hot water installations, heating elements.

!! Do not use for brazing tubes with sulphur containing oils. !!

Hardness: 180 HB

Bonding temperature: 690 °C (1270°F)

Electrical resistivity: 0.25 ohm.mm²/m (0.00001 ohms/in/in²)


Brazing gap: up to 0.5 mm (0.02").

Clean joint area thoroughly and heat the complete joint with a slightly carburizing flame.

When the parent metal is pure copper, you can apply the brazing rod directly.

On brass use flux Lastek 31C (powder), 31CH (powder for thicker pieces) or 31CN (paste).


Welding proces: Brazing rod
Material Type: Silver solder
Welding positions: NA
Norm : EN ISO 17672
Classification: CuP 279
Norm: AWS A5.8
Classification: B CuP-6
Minimum packing: 1 kg in a cardboard box