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).
ALKYL(R) | MERCAPTAN (RSH) | INACTIVE SULFUR | ACTIVE SULFUR | ODOR |
---|---|---|---|---|
C12 | tert-Dodecyl Mercaptan (TDM) | TPS 20 | TPS 32 | Very Low |
C4 | tert-Butyl Mercaptan (TBM) | TPS 44 | Medium |
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 |