Lunar exploration requires scientific and engineering studies using standardized testing procedures that ultimately support flight certification of technologies and hardware. It is necessary to anticipate the range of source materials and environmental constraints that are expected on the Moon and Mars, and to evaluate in-situ resource utilization (ISRU) coupled with testing and development. Physical properties of the regolith dominate processes such as excavation and drilling, while chemical properties dominate processes such as elemental extraction. We describe here the development of standardized lunar regolith simulant (SLRS) materials that are traceable interlaboratory standards for testing and technology development. These SLRS materials must simulate the lunar regolith in terms of physical, chemical, and mineralogical properties. A comprehensive simulant development program has been outlined and is in progress. A summary of these issues is contained in the 2005 Workshop on Lunar Regolith Simulant Materials
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