Iodine Information



Other Names


Chemical Formula


CAS Number

7553 – 56 – 2

Industry Uses

Anti-infective; Chemical Laboratories

Health Risks

Irritation of eyes and respiratory system; Headaches, Dizziness

Vapor Pressure

0.3 mmHg

Water Solubility





Sharp, pungent

Iodine MSDS

What is Iodine?

Iodine is an essential constituent of thyroid hormones and is essential for growth and development. Iodine deficiency causes goiter and hypothyroidism, and it is the most common cause of preventable mental defects. Solid iodine is violet-black with a metallic luster and sharp odor. It can be found naturally in sea water and certain rocks. Iodine vapors are toxic and corrosive, and vapor becomes visibly purple as concentration increases. Iodine is an anti-infective, used frequently in medicine as a topical disinfectant. It is also used in microbiology laboratories as a staining method. Iodine is also added to table salt to ensure people get enough iodine in their diets. Iodine is very toxic to aquatic life. Iodine is non-combustible and non-flammable, but presence of iodine can enhance combustion of other substances.

Iodine Exposure and Health Risks

Iodine can be harmful if swallowed, inhaled, or directly contacted. It is an irritant, especially to the eyes and respiratory system. High concentrations of iodine can cause skin irritation, burns, and rashes. Vapors of iodine are toxic, and repeated or prolonged exposure can cause organ damage. Symptoms of iodine inhalation are headaches, chest tightness, and lacrimation (discharge of tears).


The table below summarizes the most-recent exposure limits.




0.1 ppm

C (10 min)


0.1 ppm

C (10 min)


Sources: NIOSH, OSHA

Measuring Iodine

Iodine concentration in the air can be measured in units of parts per million (ppm). Many of our products have digital communication capabilities for easy monitoring and control. We carry portable and fixed Iodine monitors and kits. All of our Iodine products can be viewed HERE.

Contact us for help choosing the right monitor for your application