WT40 - orange
Increased thorium content for best ignition
- Colour: orange
- For carbon steel, stainless steels, silicon bronze, copper, bronze, titanium.
- Composition: W + 4% thorium
- Excellent ignition properties due to increased thorium content compared to WT20.
- Can be replaced by non-radiating electrodes such as Lymox® or WL15.