Tychem® 9000 Coverall. Collar. Elastic Wrists and Ankles. Storm Flap with Adhesive Closure. Taped Seams. Yellow. DuPont Tychem® 9000 offers wide-ranging protection backed by extensive fabric permeation barrier testing. Tychem® 9000 fabric provides at least 30 minutes of protection against more than 280 chemical challenges, including chemical warfare agents. Tychem® 9000 offers tear, puncture and abrasion resistant fabrics for lasting protection. Tychem® 9000 garments are designed for enhanced comfort and ease of movement. High visibility yellow.