Since the discovery of Tyvek® in 1955, DuPont has been a recognized global leader in selective barrier technology. With its proprietary selective barrier technologies - Tyvek brand polyolefin, DuPont Sontara spunlaced fabric, Typar and Xavan spunbonded polypropylene, Advanced Composite Technology (ACT) and the new HMT hybrid membrane technology - DuPont has introduced new dimensions of protection, security and safety in more than 50 diverse industries, including protective apparel, construction, envelopes, medical and industrial packaging, and graphics.