They are coatings used in bed fillings, also known as White Metal. 

It is a coating also known as white metal. It is a coating that is mostly used in bed fillings. Babbit coating is preferred especially for the shafts and cylinder trunnions to work smoothly in the bearing and for the metal residues in the lubricating oil to be absorbed without damaging the shaft and bearing. It is a coating applied in various sectors, especially in the iron and steel industry, petrochemical industry and machinery manufacturing industry. Babbit coatings are successfully applied by our company using Flame Spray and Arc Spray methods.