DuPont Tychem 4000 Long Sleeved Aprons with Elastic Wrists Tychem 4000 utilizes Saranex 23-P film laminated to Tyvek fabric to provide a rugged and durable fabric that resists abrasion. Delivers effective protection against a range of chemical environments. Tychem 4000 fabric provides at least 30 minutes of protection against >124 chemical challenges. Knee-length apron/gown design with attached sleeves that provides enhanced frontal protection. Taped seams provide strong chemical resistance against heavy liquid splashes Pack of 12