Active sulfur refers to the sulfur content released from additive in the presense of copper power.
Thermal behavior of additives is a good indicator of performance. Figures show that trisulfides (TPS20) present higher thermal stability than pentasulfides (TPS32).
|TPS 20||TPS 32||Very Low|
TPS exhibits outstanding performances: low odor, light color, excellent solubility in a variety of base fluids, high sulfur content and high EP capacity. These properties stem from their unique manufacturing process starting from high purity mercaptans (RSH).
|R-CR=CH₂ + H₂S||➡||R-SH|
|R-SH₂ + S||➡||R-Sx-R|