Beta cloth is a type of fireproof silica fiber cloth used in the manufacture of Apollo/Skylab A7Lspace suits 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 may be coated with Teflon.
Beta cloth was developed by a Manned Spacecraft Center team led by Frederick S. Dawn and including Matthew I. Radofsky working with the Dow-Corning Company. It was implemented in NASA space suits after the deadly 1967 Apollo 1 launch pad fire, in which the astronauts' nylon suits burned through. The fire-resistant Beta cloth was among changes to make the Apollo spacecraft and systems safer in the event of a similar situation.