Alpha Pro Tech, Ltd. engages in the development, manufacture, and marketing of disposable protective apparel, building supply, and infection control products principally in the United States. It operates in three business segments: Building Supply, Disposable Protective Apparel, and Infection Control. The Building Supply segment offers construction weatherization products, such as housewrap and synthetic roof underlayment. The Disposable Protective Apparel segment provides disposable protective apparel, such as shoecovers, bouffant caps, gowns, coveralls, lab coats, frocks, and other miscellaneous products. The Infection Control segment offers face masks and eye shields. The company's products are used primarily in cleanrooms; industrial safety manufacturing environments; health care facilities, such as hospitals, laboratories, and dental offices; and building and re-roofing sites. Its target markets include pharmaceutical manufacturing, bio-pharmaceutical manufacturing and medical device manufacturing, lab animal research, high technology electronics manufacturing, medical, and dental distributors; and construction, building supply, and roofing distributors. The company sells its products through a network of purchasing groups, national distributors, local distributors, and independent sales representatives; and through its own sales and marketing force under the Alpha Pro Tech brand name, as well as under private label. Alpha Pro Tech, Ltd. was founded in 1983 and is based in Markham, Canada.