The following is from the important SS manual Entkeimung, Entseuchung und Entwesung (Sterilization, Disinfection, and Disinfestation) by the Arbeitsanweisungen für Klinik und Laboratorium des Hygiene-Institutes der Waffen- Berlin (Working instructions for the clinic and laboratory of the Hygiene Institute) written by Dr. med. Walter Dötzer – I apparently scanned this into OCR copiable text from Fritz Berg’s collection years back – thanks Scott.

Link from RODOH – OCR version – text can be copied

https://archive.org/details/Doetzner-Walter-Entkeimung-Entseuchung-und-Entwesung

This is the segment on T-Gas which is a mixture of Ethylene oxide with CO2. This segment comes right after segments on cyanide and Zyklon.