A makwaara dị ka morphin, ọ bụ mmiri ara ehi na-enweghị agba na okpomọkụ. Ebe mgbaze -4.76 ℃, ebe esi 128.3 ℃. Njupụta 1.0005g/cm3(20℃). Ntụgharị ntụgharị 1.4548. Ebe Flash 38 ℃ (oghe iko). Miscible na mmiri, acetone, benzene, ether, mmanya, ethylene glycol, linseed mmanụ, turpentine mmanụ, castor mmanụ. Ọ nwere hygroscopic na amonia isi.