Assay(GC) : 99% min Ash: 0.15% max Melting point: 128-132DC Transmittance(425nm): 98.5% min Transmittance(500nm): 99% It can be used as light stability agent and also the key intermediate for medicine, bleaching agent, polymerization inhibitor and epoxy resin cross linking agent. 2,2,6,6-Tetramethyl-4-Piperidinol(TMP)