Beta cloth

Beta cloth is a type of fireproof silica fiber cloth used in the manufacture of Apollo/Skylab A7L space suits, the Apollo Thermal Micrometeoroid Garment, and in other specialized applications.

Beta cloth consists of fine woven silica fiber, similar to fiberglass. The resulting fabric will not burn, and will melt only at temperatures exceeding 650 °C. To reduce its tendency to crease or tear when manipulated, and to increase durability, the fibers are coated with Teflon.