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One of the most important of material that is used in drilling is Gilsonite.
Gilsonite is a high-strength bitumen modifier and proven for road surfaces after hot asphalt princip. It is a 99,9% pure natural hydrocarbon without proper filler content and with a melting point at about 150°C. It is a natural bitumen, a petroleum-based solid state, which gets along very well with petroleum bitumen.
Other materials are Caustic Soda (hydroxide Sodium), calcium chloride, Bentonite, carbonate calcium , ...
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