ISO 10788:2014

Overview

ISO 10788:2014 - Space systems - Lunar simulants is an international reference standard that defines quantitative measures for lunar regolith simulants. The standard is explicitly intended for regolith particles 10 cm and smaller and ties simulant characterization to measured lunar samples from the Apollo and Lunakhod missions. ISO 10788 provides a common, normalized framework to compare simulants and to communicate their geological quality between developers, operators and test laboratories.

Key topics and technical requirements

• Figures of Merit (FoM): The standard centers on four core Figures of Merit that quantify how well a simulant matches lunar material:
  • Composition FoM - weighted, normalized comparison of constituent concentrations (normalized to a 0–1 scale where 1 = perfect match).
  • Size Distribution FoM - quantitative comparison of particle size distributions across defined size bands.
  • Shape FoM - includes particle-shape metrics (e.g., Feret diameter, aspect ratio, sphericity, Heywood circularity factor) to quantify morphological similarity.
  • Density FoM - bulk and specific gravity comparisons and measurement requirements.
• Comparative baseline: All FoMs must be stated against a single, explicit baseline (e.g., a specific Apollo sample set). If multiple baselines are used, a complete FoM set is required for each baseline.
• Impurities and contamination: Simulant impurity must be reported as percent mass; contamination must be reported as percent volume with characterization of contaminant types when analyzed.
• Validation and re-use: FoMs must be calculated for each use; if a simulant volume is re-used, FoMs must be re-evaluated and recorded.
• Normative references: The standard references key background sources such as the Lunar Sourcebook and recognized geologic glossaries for terminology and context.

Practical applications

ISO 10788 is practical for any organization needing quantitative, repeatable assessment of lunar simulants, including:

• Development and testing of space systems and hardware exposed to lunar regolith or dust
• Simulant producers validating product quality against lunar baselines
• Test laboratories performing materials, dust mitigation, mobility, and excavator performance testing
• Mission planners and operations teams that require documented, comparable simulant properties for verification and acceptance

Using ISO 10788 helps ensure consistent expectations for simulant performance in engineering tests, reduces ambiguity in procurement and reporting, and supports traceable comparison to Apollo/Lunakhod sample data.

Related standards and bodies

• Prepared by ISO/TC 20 / SC 14 (Space systems and operations)
• Normative background: Heiken et al., “Lunar Sourcebook” and geological glossaries cited in the draft standard

Keywords: ISO 10788:2014, lunar simulants, lunar regolith, figures of merit, composition, size distribution, particle shape, density, Apollo, Lunakhod, space systems.