but-2-yne C4H6but-2-yne, but-2-yneDonate now to keep this information ad-free.DonatePhysical characteristicsMolecular mass 54.09Density N/AMelting point N/ABoiling point N/AFlash point N/AFire point N/ARel. permittivity N/APartition coeff. (logP) N/ACompound added to the database on November 7, 2020, last modified on September 6, 2022.