Abstract: Employee #1 was a wafer lab operator in the etching department of a semiconductor manufacturer. Under clean room conditions, the wafers are placed in a basket, then dipped and agitated in acid for several minutes; the employee's hands do not touch the acid. During her shift, Employee #1 dipped wafers in acid and also poured three 1-gallon bottles of acid into mixing compartments. At the end of her shift, Employee #1's right hand and fingers began to hurt. She contacted her employer, who sent her to the company's medical clinic, where she was treated for acid burns. Employee #1 was hospitalized for 6 days before returning to restricted work. At the time of the accident, she was wearing personal protective equipment consisting of acid resistant gloves, a plastic smock, and a full face shield along with a clean room suit.