Designed for use in a controlled environment. Polyethylene paper does not generate contamination. Non-tearing. Cleaned and packaged in our own Class 100 (ISO 5) cleanroom. Takes all forms of writing tools, printing, stamps, etc. Custom sizes available on sheets, rolls and pads, custom printing available, one or two sides. Melting temperature 275°F. 90% opacity. Plain white or ruled blue or black. 8 1/2" x 11", 250 sheets/bg., 4 bgs./cs. (Cannot be photocopied). Particle counts available upon request.