The Science

Is DHP™ safe?

Short answer: Yes. But we know the details matter. Let’s break down the finer points.

Synexis’ DHP™ technology does not emit ozone.

DHP™ devices are manufactured at an EPA registered establishment in accordance with the Agency’s requirement for devices. Synexis devices also underwent rigorous testing by Underwriters Laboratories (UL) and were certified to meet UL2998 for zero ozone emissions.

To achieve this certification, products must demonstrate that they emit less than the maximum ozone concentration limit of 0.005 ppm (5ppb), which is below the quantifiable level for ozone testing. Synexis proudly passed this test.

Outperformed OSHA stafety standard¹

DHP™ is deployed at less than 10 parts per billion, which produces extremely effective microbial reduction at incredibly safe levels of H202. Basically, a single Synexis unit would have to run non-stop for 2.5 years to reach the same concentration of 1 droplet of a 3% aqueous solution of H202, which is the Hydrogen Peroxide you know as a brown bottle inside your medicine cabinet. At these levels, DHP™ concentrations fall far below acceptable safety limits for human exposure established by OSHA.

Attacks microbes while you work.

DHP™ was designed specifically to allow people to safely remain inside the same room where the technology is breaking down microbes. DHP™ will continuously attack microbes while everyone in the space goes about their day, no disruption needed. Hydrogen Peroxide already exists inside human lungs. And the DHP™ from Synexis flows at levels well below those naturally maintained inside the lungs.

Attacking microbes in the air and on surfaces.

Synexis Sphere with air flowing in and out

Microbes like viruses, bacteria, mold, and chemical odors pose the biggest health risks. These microbes can be passed along in the air and on surfaces, potentially creating an endless and dangerous cycle. But DHP™ reduces microbes in even the hardest-to-reach areas.

Not every cleaning method can conquer microbes both in the air and on surfaces. Manual cleaning often misses microbes in the air, and still, the surfaces are only as clean as the last scrub. Methods like UV Light and Hydrogen Peroxide Vapor may address both but are toxic upon direct exposure to people. DHP™ doesn’t have these challenges.

How our DHP™ is expertly crafted.

Every indoor environment naturally contains ambient oxygen and humidity. Once inside our device, the oxygen and humidity are broken apart by a photocatalytic reaction (a chemical reaction involving the absorption of light) and put back together as DHP™ — hydrogen peroxide in its true gas form.

Animation of production of dry hydrogen peroxide

Numbers tell the tale.

Synexis attacks and breaks down every species and type of microbe on which it’s been tested. As a data-driven company, we use both third-party and real-world testing, in the size of real-life environments, to optimize a pioneering microbial reduction approach that produces cleaner and productive environments for our clients.

Reference: 1. “Hydrogen Peroxide,” Occupational Safety and Health Administration, 2018,