How to Use

Principal Investigators/supervisors use this form to give prior approval for chemical usage involving the following restricted chemicals:

• Toxic gases regulated by Santa Clara County (e.g. diazomethane, hydrogen cyanide, hydrogen fluoride (anhydrous), and nickel carbonyl)
• Dimethylmercury
• Chemicals classified as Department of Transportation (DOT) Division 1.1 explosives (e.g., picric acid, 2,4-dinitrophenylhydrazine (DNPH), ammonium perchlorate)
• Tert-butyllithium
• Hydrofluoric acid
• Tetramethylammonium Hydroxide
• Procedures with “high” and “unacceptable” risk ratings on a self-conducted Laboratory Risk Assessment

Section 5.2 of the Chemical Hygiene Plan (CHP) lists other options for granting and documenting prior approval.