What Is a SIP Reactor? Sterilization, Design & Applications Answering the core question: What is a SIP reactor, and how does in-place steam sterilization guarantee aseptic operation? An SIP reactor is a vessel engineered to be sterilized in situ with saturated steam at 121-134 degree C for 15-30 min, achieving a sterility assurance level (SAL) of 10 to the minus 6 - a probability of a non-sterile unit below one in a million. Thermocouple mapping validates that every surface,