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Purchasing Guidelines Handbook - POLYANIONIC CELLULOSE - PAC HV (API 13A 18th Edition 2010) - For Drilling Fluids




Product: High-viscosity polyanionic cellulose(PAC-HV)


Grade: Regular


Product Description:


API Specification 13A-18 1.1   

PAC-HV, also referred to as API PAC regular grade, is a water-soluble polymer produced only from cellulose chemically reacted with carboxy-methyl (anionic)groups. The product obtained is further purified to significantly increase the active polymer content.   

The product is a free-flowing and/or granular powder. See Table 17 for physical requirements.


API Specification 13A-18.1.2   

PAC-HV is widely used in water-based drilling fuid for a variety of applications, such as filtration control, viscosity and shale inhibition. Although field use can vary, this procedure focuses on filtration-control and viscosity-control characteristics.


Product Physical: API Specification 13A - 18.1.7

Requirements: To obtain the best handling in the field, it is recommended that the particle size for the PAC-HV powder be u 0.8mm(u 20 mesh)


Technical Requirements: API Specification 13A-18.1.1

Product Rejection: It shall not contain any other polysaccharides, such as starch, guar or other naturally occurring polymers or their derivatives.


API Specification 13A-18.1.4   

PAC-HV shall be free of any foreign polymer. Therefore, a qualitative starch determination shall be performe before performance tests. If starch is found, no further should be performed and the sample shall be rejected.


Table 17- PAC-HV physical requirements

Requirement Standard

Presence of starch or starch derivatives


Moisture Content 

Maximum 10%

Apparent Viscosity

Minimum 50cp

API Filtrate Volume

Maximum 23ml

Note: General Shipping & Marking Requirement are listed in the General Requirements Section of this Purchasing Guideline.