Equex-STM is a detergent paste that has been found to improve post-thaw survival and longevity of spermatozoa from various species when added to semen freezing extenders. Available in 7ml and 240ml bottle. Research Links: The combinatorial effect of different Equex STM paste concentrations, cryoprotectants and the straw-freezing methods on the post-thaw boar semen quality. Reprod Domest Anim. 2013 Feb;48(1):53-8. doi: 10.1111/j.1439-0531.2012.02022.x. Epub 2012 May 21.