Dermatitis from aziridine hardener in printing ink

Area of Science:

• Occupational Dermatology
• Industrial Hygiene
• Toxicology

Background:

• Polyfunctional aziridine hardening agents are used in water-based inks.
• Dermatitis is a common occupational skin disease.
• Previous research on aziridine-induced dermatitis is limited.

Purpose of the Study:

• To investigate the association between handling aziridine-containing inks and the development of dermatitis.
• To identify risk factors for aziridine-induced dermatitis.
• To inform preventive measures for occupational skin exposure.

Main Methods:

• A cohort of 51 workers handling water-based inks was studied.
• Data on dermatitis development, work practices, and exposure levels were collected.
• Incidence rates and latency periods were calculated based on job roles and exposure intensity.

Main Results:

• 13 out of 51 workers developed dermatitis of the hands and face.
• The highest incidence was among ink mixers handling undiluted aziridine (6/8).
• Printers handling inks with 2-4% aziridine had a lower incidence (7/22), with mean latencies of 3.2 and 6.2 months, respectively.

Conclusions:

• Direct skin contact with aziridine hardeners, particularly undiluted, poses a significant risk for dermatitis.
• Improper work practices and inadequate use of protective clothing are key contributing factors.
• Further research is needed to determine if aziridine compounds themselves, independent of trimethylolpropane triacrylate (TMPTA), cause dermatitis.