What is the fiber composition of Tyvek?

• A. 100% Cotton
• B. 100% Olefin
• C. 60% Polyester, 40% Rayon
• D. 50% Nylon, 50% Polyester

Answer: (B)

Tyvek is made from high-density polyethylene fibers, which places it in the olefin family. Olefin fibers come from polyolefin polymers like polyethylene, so Tyvek’s fiber content is effectively 100% olefin. It’s not cotton or a cotton blend, and it isn’t a nylon–polyester or polyester–rayon mix. Tyvek is a nonwoven material created by flash-spinning HDPE fibers and bonding them into a sheet, which explains its lightweight, durable, and protective characteristics.