Gemini Heat Shield, Ablated


Display Status:

This object is on display in the Human Spaceflight exhibition at the Steven F. Udvar-Hazy Center in Chantilly, VA.

Collection Item Summary:

A heat shield protected the two-man Gemini spacecraft against the enormous heat of reentry into the atmosphere beginning at a velocity of more than 27,500 kilometers (17,000 miles) per hour. Like those of other early human spacecraft, Gemini's heat shield derived from ballistic-missile warhead technology. The dish-shaped shield created a shock wave in the atmosphere that held off most of the heat. The rest dissipated by ablation: charring and evaporation of the shield's surface. Ablative heat shields are not reusable.

The ablative substance of the Gemini heat shield is a paste-like silicone elastomer material which hardens after being poured into a honeycomb form. This heat shield may have been installed on Gemini 2, launched on an unmanned test in January 1965. The circular marks show where samples were removed afterward for testing, and the resulting holes repaired. In 1970 McDonnell-Douglas gave this object to the Smithsonian on behalf of NASA.

Collection Item Long Description:

Inventory Number


Credit Line

Transferred from the National Aeronautics and Space Administration through McDonnell Aircraft Corp.

Country of Origin

United States of America


Base: Resin-impregnated fiberglass; Honeycomb filling: Dow-Corning DC-325 ablative material; Outer ring: Fiberite


Overall: 7 ft. 8 in. diameter, 240 lb. (233.68cm, 108.9kg)

Data Source

National Air and Space Museum

Restrictions & Rights

Do not reproduce without permission from the Smithsonian Institution, National Air and Space Museum


SPACECRAFT-Manned-Parts & Structural Components