T 6229 (OTTO) 1,1,3,3-Tetramethyldisiloxane, 97% Cas 3277-26-7 - used organic silicon intermediates, and usually be used as organic silicon blocking agent. Due to containing reactive Si-H groups in the molecular structure, T 6229 (OTTO) 1,1,3,3-Tetramethyldisiloxane, 97% Cas 3277-26-7 - used in the synthesis of copolymer macromolecule by hydrosilylation.