1. n. [Drilling Fluids]

A solvent used with water to break the emulsion of an oil-base or synthetic-base drilling fluid to prepare the sample for chemical titrations to determine lime, calcium or chloride content according to API testing procedures. PNP is an abbreviation for propylene glycol normal propyl ether. It is an environmentally friendlier replacement of a xylene-isopropynol mixture previously used in certain titrations.

Alternate Form: propylene glycol normal propyl ether

See related terms: chloride test