Zinc dialkyl dithiophosphates (ZDPP MD)

Zinc Dialkyl Dithiophosphates (ZDDP MD) are a specialized variant within the ZDDP family, widely used as antiwear, antioxidant, and corrosion-inhibiting additives in lubricants. The “MD” designation typically refers to medium molecular weight dialkyl groups, which influence the additive’s thermal stability, solubility, and film-forming behavior. 

ZDDP MD is often preferred in formulations where moderate volatility, good solubility, and balanced reactivity are required. It’s less aggressive than short-chain ZDDPs (which form films quickly but are less stable) and more manageable than long-chain variants (which may resist decomposition).