Water and vapor resistant. For general purpose packaging, construction and agricultural uses. Helps protect surfaces from dust and grime. Most popular sizes - made to lp-378 standards. Not intended to be used in contact with food. Meets the requirements of cid-a-a3174. Established in 1933, Envision offers high quality products at competitive prices while providing the ability to improve the quality of life for the blind and visually impaired through employment, outreach, rehabilitation, education and research. For more information about Envision visit our website