a walk through survey was made at wabash magnetic company (sic-3079) , located in huntington, indiana for the purpose of determining the extent of worker exposure to 4,4'-methylenedianiline (101779) (mda) in a batch type mixing operation and user of b-stage resins. at this site the chemical was used as a hardening agent to produce the resins used to make transfer molded parts. air, wipe, bulk, and urine samples were taken to determine exposure levels. in both the formulating and molding departments, evidence was found for the possible inhalation of and dermal contact with mda. air concentrations were detectable, but were below the permissible exposure level of 10 parts per billion (ppb) proposed by osha. of seven workers monitored by urinalysis, two were excreting detectable amounts of mda with the higher concentration being 16 ppb. the author recommends a combination of modified work practices and alternative personal protection to reduce exposures. a vacuum installed with a hepa filter should be used in the dry cleanup processes in the mixing and formulating departments and workers should wear a glove which is more resistant to permeation than the cotton ones now in use at the site. gloves made of polyvinyl-chloride or natural latex are suggested