Lignite-Resin SPNH is an ultra-high-temperature fluid loss reducer produced by the graft copolymerization and sulfonation of lignite, phenol, and sulfite. It represents an upgrade and integration of the functions of Sulfonated Lignite (SMC) and Sulfonated Phenolic Resin (SMP).

Sulfonated Lignite (SMC), commonly known as a high-temperature fluid loss reducer, is a drilling fluid additive produced by the sulfonation of natural lignite. It appears as a black or dark brown powder or granules.

Sulfonated Asphalt Powder FT-1 is an anionic asphalt-based drilling fluid additive produced by the sulfonation of high-quality asphalt. It appears as a black or brownish-black free-flowing powder, partially soluble and well-dispersible in water.