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1. Regular grade polyanionic cellulose (PAC-R)

Regular grade polyanionic cellulose referred to PAC-R. PAC is a kind of water-soluble cellulose ethers derivatives made from natural cellulose by chemical modification. As an important cellulose ether, PAC is appeared as white to yellowish powder or granule, non-toxic and odorless, easily soluble in both hot and cold water. PAC has more stable performance of the application thus can be used in all the field of the CMC. PAC has good stability of heat-resistance, salt tolerance and antibacterial property. The mud fluids made up with the PAC has good water loss control, suppression and high temperature resistance. So it can be widely used in the oil drilling especially the salt water and seawater drilling.

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