Tough-Spots® are chemically inert and flexible white and colored polyolefin labels that adhere to most plastics (best performance with virgin polypropylene) as well as glass and metals. These labels withstand temperatures from -320°F to +212°F (-196°C to +100°C) (vapor and liquid-phase nitrogen storage, up to moderate oven temperatures) and can endure sustained humidity and soaking, submersion in boiling water baths, autoclaving, organic solvents, caustic agents and other challenges without peeling, degrading or becoming brittle.
Tough-Spots® will accept any marking instrument. Just write or print from a laser printer (instructions included for printing from Microsoft Word), peel back the label and affix to the top or side of a microtube or cryovial. Rainbow packs are available for laser sheets, and consist of four sheets of each of the following colors: blue, green, orange, red, and yellow (20 total sheets). Laser sheets are polyolefin, roll label stock is polyvinyl.