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* White tiles (known as low temperature reusable surface insulation or 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 high temperature reusable surface insulation or HRSI<ref name="materials">{{cite web |url=https://www.nasa.gov/centers/ames/thermal-protection-materials/tps-materials-development/reusable.html |title=Reusable Materials |publisher=[[NASA]] | accessdate=2023-04-08}}</ref>) 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.
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