Ethylene Oxide (EtO)
Air Monitoring

Monitoring Your Environment

Get To Know Ethylene Oxide

Ethylene Oxide (EtO or EO) is colorless and odorless, as well as, flammable and explosive.  Ethylene Oxide is a highly toxic, penetrating gas and is most often used as an intermediate in the production of other chemical gases and as a sterilizing gas for medical devices and instruments. Monitoring the breathing environment near Ethylene Oxide sterilization equipment is essential because EtO poses a number of serious health risks to nearby workers.  Every environment that is using Ethylene Oxide, should pair their work environment with a ChemDAQ Air Monitor, to make sure workers are safe.


  • Medical device manufacturing
  • Low temperature steriliztion process for medical instruments
  • Low temperature sterilization process for medical packs
Keep your employees safe by monitoring ethylene oxide.

What are the dangers of Ethylene Oxide Vapor Exposure?

The health risks of Ethylene Oxide, and the need to monitor ETO gas vapor, are well established.  Ethylene Oxide gas is a known human carcinogen  and overexposure to EtO can pose many negative health effects .  It presents significant challenges to those who work with Ethylene Oxide sterilization processes in hospital and commercial applications.  Workers are also at risk while Ethylene Oxide off-gassing, and without monitoring the off-gassing in the air, your employees are at risk.

Ethylene Oxide is difficult to monitor due to cross-interference from common chemicals, such as, alcohol and carbon monoxide vapors.  This often leads to inaccurate readings and false alarms.

Patented Chemical Filter Provides ETO Sensor Specificity

ChemDAQ incorporates a unique and patented filter in all of it's Ethylene Oxide sensors, providing true and accurate readings of Ethylene Oxide vapor exposure.

  • Eye irritation : eye damage after prolonged exposure

  • Nose and throat irritation

  • Skin irritation dermatitis

  • Respiratory distress

  • Known human carcinogen

  • Affects both the female and male reproductive systems

  • Birth defects

  • Increased risk of miscarriage

Regulations/ Guidelines

Exposure limits and guidelines when using ethylene oxide have been set by a number of national agencies including the following:

OSHA: Occupational and Safety Health Administration
OSHA Permissible Exposure Limit (PEL) :  1.0 ppm (8 Hr TWA) 

NIOSH: National Institute of Occupational Safety and Health
NIOSH Immediately Dangerous to Life and Health (IDLH) :  800 ppm

JC: Joint Commission
Joint Commission Standard EC.02.02.01

ACGIH : American Conference of Government Industrial Hygienist
ACGIH Threshold Limit Values TLV
:  1.0 ppm  (8 Hr TWA)
OSHA Hazard Communications 29 CFR 1910.1200

: Association for the Advancement of Medical Instrument
AAMI ST:41:1999 and ST:58:2013

: United Kingdom Health & Safety Executive
UK HSE Long-Term
: 5 ppm  

1 ppm (8 Hr TWA)

    Monitoring solutions for Ethylene Oxide.

    ChemDAQ’s Ethylene Oxide monitor provides real-time readings of vapor levels in the air for safety assurance.