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LI-900 is a type of reusable surface insulation tile developed and manufactured by Lockheed Missiles and Space Company in Sunnyvale, California. It was designed for use on the Space Shuttle orbiter as part of its thermal protection system to minimize thermal conductivity while providing maximum thermal shock resistance.〔 ==Statistics== LI-900 has a bulk density of 144.2 kg/m³ (9 lbs/ft³). It was for this reason that it was called the LI-900. It is made from 99.9% pure silica glass fibres, and 94% by volume of air. An LI-900 tile can be heated to 1204 °C (about 1478 K or 2200 Fahrenheit) and then immediately plunged into cold water and suffer no damage. Black and white tiles were used on the Space Shuttle to control the temperature of the vehicle while in orbit. *White tiles (known as LRSI) were used mainly on the upper surface and have higher thermal reflectivity. These are therefore pointed towards the sun in order to minimize solar gain. *Black tiles (known as HRSI) are optimized for maximum emissivity, which means they lose heat faster than white tiles. This property is required in order to maximise heat rejection during re-entry. There are typically 20,000 HRSI LI-900 tiles on a Space Shuttle, and 725 LRSI LI-900 tiles. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「LI-900」の詳細全文を読む スポンサード リンク
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