Drying ovens have doors that open automatically when the pressure is increased slightly from heat. Dangerous materials used in the laboratory are kept to small quantities. Dangerous materials, such as cyanides, arsenates, carcinogens, etc. are followed step by step from the time they leave the storeroom to their final disposition. All suspected carcinogens are so labeled. Refuse is not allowed to remain in the laboratory overnight.
Storeroom has well lighted exit, no blind alleys, and is properly ventilated.
All glass apparatus is borosilicate glass except reagent bottles, measuring equipment, stirring rods, and tubing. Tongs designed for specific uses are kept at hand. A good housekeeping program is set up and enforced and work benches and tables are kept free of chemicals, scraps of paper, dirty glassware, etc. Handling, carrying, or working with dangerous materials is not permitted by inadequately trained or unauthorized personnel. Emergency telephone numbers are posted in a conspicuous place in the laboratory.