2 workers at an aircraft factory were employed in a plasma sparying unit. Soon after they were equipped with new semisynthetic working suits, they started to complain of pruritic eruptions after heavy exposure to metal dust. They noted that the dust was not as easily blown off the clothes by pressurized air as previously. Clinical findings consisted of discrete macular and papular lesions, partly follicular, on the ventral and medial thighs. Atopy score, IgE level and a standard series of prick tests ruled out atopic disposition. Patch tests revealed no reactions. A diagnosis of occupational airborne irritant contact dermatitis from metal dust was therefore made. To elucidate the role of the working suit, extensive physical investigations of the physical properties of the textile were performed. Microscopic pictures at low magnification showed more dust particles on the semisynthetic working suit, compared to the former pure cotton suit. This impression could not be confirmed by particle count because of too uneven particle distribution at higher magnification. Hairiness of the 2 textiles was low and ruled out irritation by the semisynthetic textile itself. No difference in electrostatic properties between the 2 working suits could be established either. Both textiles showed high static electrical propensity. When use of the semisynthetic overall was discontinued, the patients reported no recurrence.(ABSTRACT TRUNCATED AT 250 WORDS)