دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a siliceous volcanic rock that is finely ground and subjected to extreme heat. The resulting release of water leaves the rock particles considerably expanded and thus more porous. Expanded perlite is sometimes used in cement to increase its yield and decrease its density without an appreciable effect on its other properties.

n: a siliceous ash rock which is grinded and processed under the hyperthermic situation,usually used to improve the mud making rate of the cement slurry and decline the density

n: a volcanic rock that can be extended to many times its original volume by crushing and heating under pressure. Release of the pressure causes expansion when the water in the rock turns to steam. It is used as an extender in cement.

n: generally speaking, it refers to some different size of product that made of pearl rock. it uses as porous loss layer block agent.

n: it made of pollant cement added some porous pearl rock and bentonite.