Machinist dermatitis from coolant: causes and skin protection
Contact dermatitis is the skin disease most often reported with metalworking fluids. Here is what OSHA and NIOSH say about causes and prevention.
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Why hands react to cutting fluids
Contact dermatitis shows as itchy skin and a rash, often with cracks, redness, blisters or bumps. OSHA cites NIOSH figures of 14 to 67 percent of exposed workers at risk.
Causes listed by OSHA include fluid concentration above the recommended level, high alkalinity, tramp oils carrying metal fines, MWF-soaked clothing, abrasive soaps and winter dryness.
Protective equipment and hygiene
Gloves and aprons used against dermatitis must be chemical-resistant or impervious to the fluids. Because gloves can catch in moving tools, the employer should specify which operations allow them.
Workers should wash skin with gentle soap, clean water and clean towels, especially before breaks and meals, and change out of contaminated clothes before leaving.
Questions fréquentes
Do barrier creams work?
OSHA says good quality barrier creams can help if used consistently and reapplied during the shift. They are supplements only, should go on healthy skin, and do not replace gloves or hygiene.
Can a worker with dermatitis keep the same job?
OSHA cites reassignment to an area with no skin exposure, with proper medical treatment, as one option for a serious case.
Why does soaked clothing make things worse?
Water evaporates from the fabric and leaves the fluid at a much higher concentration, which OSHA calls a major cause of dermatitis.
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