In our last blog, we looked at the importance of using high-quality sand, chemical binders and catalysts to create a good sand mould. In this second part, we look more closely at some of the other key factors.
Gas porosity may occur if hydrogen is introduced into the molten metal when it is poured into the mould. Hydrogen can be drawn in through moisture or water vapour in the atmosphere. Degassing is used to address this problem and it is carried out as a standard part of the Haworth Castings’ casting process.