Method of preparing bitumen mastic
The process is that the molten bitumen is mixed with the filler. They can be: asbestos, peat crumbs, wood sawdust, finely chopped mineral wool. The filler is necessarily sifted through a sieve with cells of 3×3 mm and is well dried. During mixing, it is necessary to add a waste engine oil. About 1 liter of oil is taken on a bucket of bitumen, which is previously filtered. The approximate ratio of components for 5 kg of mastic: 4 kg of pure bitumen, 0.5 kg of filler and 250 g of oil.