![](https://tungsten.de/_Resources/Persistent/b/7/e/1/b7e1d0da22b2fc764122fd096635c68c24fbd5f5/WT40-1498x1750-565x660.jpg)
![](https://tungsten.de/_Resources/Persistent/3/5/9/2/3592c9c1e7c9cda63c2087722dc0237bc0a345b1/WT40-Groessen-1498x1750-565x660.jpg)
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.