Cleanroom notebooks are unique. Most cleanroom notebooks are processed and packaged in an ISO Class 5, class 100 cleanroom environment. Additionally, they feature rounded, no-snag corners and high-density polyethylene covers that are resistant to isopropyl alcohol (IPA). They contain specialty-coated paper with high tear resistance to ensure durability for long periods of use. For the US markets, they are available in standard sizes such as 8.5″ x 11″. They have options such as a college-ruled or grid format. Most notebooks have a spiral binding that allows the book to lie flat and remain open when in use.