Polyanionic cellulose (PAC) is a type of water-soluble cellulose derivative that finds extensive use in various industries. PAC is available in two different viscosity grades: high viscosity (HV) and low viscosity (LV). Let's explore the differences between these two grades.

Molecular Weight:

HV-PAC has a higher molecular weight compared to LV-PAC. The increased molecular weight contributes to its higher viscosity characteristics. In contrast, LV-PAC has a lower molecular weight, resulting in lower viscosity.

Viscosity:

HV-PAC exhibits high viscosity, meaning it has a thicker consistency and provides better thickening and suspension properties. It is commonly used in applications where improved rheological control is required, such as in drilling fluids for oil and gas exploration. On the other hand, LV-PAC has lower viscosity, making it suitable for applications where less thickening effect is desired.

Functionality:

Due to its higher viscosity, HV-PAC functions effectively as a drilling fluid additive to enhance hole cleaning and suspension of solid particles. It helps to maintain wellbore stability during drilling operations. LV-PAC, with its lower viscosity, is often employed as a filtration control agent to minimize fluid loss during drilling, completion, and cementing processes.

Solubility:

Both HV-PAC and LV-PAC are readily soluble in water. However, HV-PAC may require more time and agitation for complete dissolution due to its higher molecular weight. LV-PAC dissolves relatively faster in water.

Applications:

HV-PAC is commonly used in industries such as oil and gas, mining, and construction. It serves as an essential component in drilling muds, cement slurries, and hydraulic fracturing fluids. LV-PAC, with its lower viscosity, finds applications in the food industry as a stabilizer, in the textile industry for sizing and coating, and in pharmaceutical formulations.

In summary, the difference between high viscosity (HV) and low viscosity (LV) Polyanionic cellulose lies in their molecular weight, viscosity characteristics, functionality, solubility, and applications. HV-PAC offers higher viscosity and better rheological control, while LV-PAC provides lower viscosity and is suitable for specific applications requiring less thickening effect.