OS PAC RT & LT - Polyanionic Cellulose (Technical)



Polyanionic Cellulose (PAC)

Polyanionic cellulose is a core additive in many water based mud systems due to its functionality, stability and economy. PACs give good fluid loss control by tightening filter cakes, help solids separation by encapsulation of cuttings and contribute to hole cleaning. PAC performance is wholly dependent on its molecular weight, purity and the degree and regularity of the substitution along the cellulose backbone. PAC selection is fundamental to the overall performance of many water based mud systems.


Product Information 

OS PAC RT and LT are high and low molecular weight technical grade polyanionic cellulose polymers.

OS PAC RT and LT can be used in the field up to 150oC / 300oF in fresh, seawater and saturated salt salinities. OS PAC RT and LT are resistant to bacterial attack.


Typical Physical Properties 

Appearance   -   Free flowing off-white powder

Purity   -   60 – 65%                              

Degree of Substitution   -   ≥0.65

Moisture Content   -   10% max                                   

pH of 2% Solution   -   5.5 – 8.5

Particle Size   -   95% min, pass through 40 mesh



OS PAC RT is a long chain, high molecular weight polymer exhibiting excellent fluid loss control and encapsulation in lower weight mud systems. The chain length and substitution regularity along the cellulose backbone of OS PAC RT ensures the best possible performance.

OS PAC LT is a lower molecular weight and shorter chain polymer that gives lower viscosity and is ideal for higher weight mud systems.



OS PAC RT and LT are applied in concentrations of 0.75 –10.0 kg/m3 for fluid loss control, encapsulation and viscosity depending on the mud weight and required API fluid loss. __



OS PAC RT and LT are packaged in 25 kg sacks.




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