This patient information on Mixed Dialkyl Thiourea is provided by John L. Meisenheimer, M.D. a board certified Dermatologist and skin care specialist based in Orlando, Florida. This information is not intended as a substitute for the medical advice or treatment of a dermatologist or other physician.

The results from your patch testing showed a positive reaction (contact allergy) to this chemical. Your immune system reacts with its defense mechanisms with each exposure of this chemical to your skin. It is unknown why certain individuals develop allergic sensitivities. In some it may take several exposures over long periods of time before an allergy develops. Once you have become sensitized (allergic) your immune system always “remembers”. If you currently have eczema this chemical may be the cause but other factors may play a role as well. The information below will help you avoid this allergen.

Thiourea is used as a photographic fixing agent as well as an antioxident in the manufacture of rubber especially neoprene.

It is also used as a coating in some copy papers to prevent yellowing.

Where is chemical found?

Adhesive tape backing
Blue prints
Diazo Copy paper
Elastic in clothing
Equipment for handling and dumping oil at sea
Fire protection suits
Glue remover.
Industrial detergents
Metal pickling solutions
Neoprene foam weather strips used in cars
Paint remover
Shoes insoles
Silver polish
Textile cutting patterns duplicated by Diazo paper processing
Wet suits

Hints on avoiding chemical:

Always check product labels and use only ingredient labeled products that do not list this chemical or its synonyms.
It may take 2 to 3 weeks of avoiding exposure before improvement of your eruption begins.

Other names you may see this chemical listed as:

Dibutylthiourea (DBTU)
Diethylthiourea (DTU)
Dimethylthiourea (DMTU)
Diphenylthiourea (DPTU)
Ethylbutylthiourea (EBTU)
Ethylenethiourea (ETU)
Tetramethyl thiuram disulfide

Possible Occupational Exposures:

Photographic Process machine Operator
Metal Plating Machine Operators
Drafting Occupations
Chemical Technicians

© John “Lucky” Meisenheimer, M.D.  2019                                   WWW.OrlandoSkinDoc.com