A specially formulated chemistry, STERIS’ Vaprox Hydrogen Peroxide Sterilant drives the efficacy and performance of STERIS’ patented VHP process technology. STERIS VHP Biodecontamination Units utilize STERIS’ patented, world renowned VHP process technology and Vaprox Hydrogen Peroxide Sterilant. VHP process technology, introduced in 1991, uses hydrogen peroxide in the vapor state as a broad-spectrum antimicrobial with no condensation of active ingredient onto surfaces.