GA International Permanent Autoclave Labels are ideal for glassware, surgical instruments, metal and plastic surfaces, trays, blister packs, and other items intended for use in steam autoclaves, ovens, and gamma irradiators. These autoclave laser labels are durable, inert, weather & water-proof, alcohol-resistant, and have been tested to endure up to 20 autoclave cycles (up to 132°C, 30 psi). Compatible with all major brands of desktop laser printers.