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Occupational dermatitis from a one-component naphthalene type epoxy adhesive.

Kozo Yokota¹, Yasushi Johyama, Naomi Matsumoto

¹Matsushita Science Center of Industrial Hygiene, Kadoma, Osaka, Japan.

Industrial Health

|April 3, 2002

Summary

A new epoxy resin adhesive caused work-related dermatitis in 27.8% of electronics plant workers. The study highlights the need for protective measures and further research into naphthalene-based epoxy resins to prevent occupational skin issues.

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Area of Science:

Occupational Dermatology
Materials Science
Industrial Hygiene

Background:

A new one-component naphthalene type epoxy resin was utilized as an adhesive for circuit board reinforcement in an electronics manufacturing setting.
The adhesive formulation included diglycidyl ether of bisphenol A (DGEBA) and 1,6-bis(2,3-epoxypropoxy)naphthalene epoxy resins, hardened with methylhexahydrophthalic anhydride (MHHPA).

Observation:

A significant proportion of workers (15 out of 54, 27.8%) developed work-related dermatitis.
The hands were the most frequently affected area, with a short mean latent period of 2.2 weeks.
Dermatitis was linked to specific tasks like filling dispensers and manual adhesive application, with workers initially lacking protective gloves.

Findings:

The study could not pinpoint the specific causative agent or differentiate between allergic and irritant contact dermatitis due to a lack of patch testing.
A high percentage of affected workers (66.7%) required medication, and 60% were reassigned to different roles.
The symptoms were closely associated with direct contact during adhesive handling processes.

Implications:

Minimizing occupational exposure to epoxy resins through stringent hygiene practices, including the mandatory use of protective gloves, is crucial.
Further research is essential to elucidate the allergenic potential and dermatological mechanisms of 1,6-bis(2,3-epoxypropoxy)naphthalene.
This study underscores the importance of evaluating novel chemical agents in occupational settings to proactively address potential health risks.