Encyclopedia Astronautica
1969.07.09 - Apollo astronaut itching due to insulation in the command module

Microscopic examination of dust particles collected from the spacecraft after the Apollo 10 mission and of samples collected from the inside of nine garments worn by the Apollo 10 astronauts confirmed preliminary findings that the itching experienced by the astronauts was due to the insulation in the tunnel hatch of the command module.

Investigation showed the fiberglass insulation had flaked off during LM pressurization. Review of thermal conditions indicated the insulation was not essential and it was eliminated from future vehicles.

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