Vac-In-Stuff is a chemical mixture of polyalkyleneoxide modified heptamethyltrisiloxane (84%) and allyloxypolyethyleneglycol methyl ether (16%) manufactured by Momentive Performance Materials, which sells this product under the tradename of Silwet L-77

Vac-In-Stuff is an essential infiltration media ingredient for all Agrobacterium-based transformations of Arabidopsis and other plants.