Cooking oil bituminous mastics

Mastic asphalt is mixed with various fillers and plasticizers. The filler can be used dry wood flour, ground and sifted peat moss or wood, chopped mineral wool.
Regardless of the type of all the fillers should be well dried and crushed and unable to form lumps.
Of plasticizers often use waste motor oils, the amount of which in the mastic should not exceed 5%.
Compared with pure molten bitumen mastic has several advantages: at low temperatures, they are less fragile, soften at higher temperatures, provide a more robust bonding roll materials.
Mastic is prepared in a special cooking pot with a well fitting lid. The boiler is placed on a metal tripod, coated bricks so as to obtain a furnace. Boiler set on a tripod with a slight slope to avoid sunbathing is poured asphalt.
For the same reason you should not load the bitumen boiler more than three quarters of its volume.
Paste made from a mixture of bitumen grades III and V. To do this, first put into the pot pieces fusible bitumen grade III. Boiler put on the fire and stir bitumen wooden spoon, bring it to a complete meltdown. Once on the surface of the bitumen froth disappears, it added little pieces of bitumen grade V and bring the temperature of the entire mass of up to 200 ° C. Under no circumstances should there be overheating mastic, as at higher temperatures, it loses its quality.
Mastic is ready when its surface ceases to foam and becomes glassy. After that, it poured in small portions warmed by an iron sheet filler, melt stir constantly. Another batch of filler just to sleep after the foam shall fade. Then paste in plasticizer added and again mixed thoroughly. Sealant applied to the surface cools quickly, so it should be used immediately after preparation, not allowing it to cool below 120 ° C.
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