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Lab Certifications
18 independent test reports from Centro Tecnológico del Mármol (CTM), Spain — issued May 2026. Our Moroccan limestone was tested per ASTM C97, C170, C880, C99, C1353 and EN 12371, 12372, 14066. All reports available for download below.
Key Results
| Test Property | Atlas Beige | Atlas Grey |
|---|---|---|
| Water Absorption | 2.99% (ASTM C97) | 3.89% (ASTM C97) |
| Bulk Density | ~2,454 kg/m³ | ~2,441 kg/m³ |
| Compressive Strength | 46–90 MPa (ASTM C170) | 40–85 MPa (ASTM C170) |
| Flexural Strength | 7.6–13.9 MPa (ASTM C880) | 7.2–14.3 MPa (ASTM C880) |
| Frost Resistance | Certified EN 12371 | Certified EN 12371 |
| Classification | Calcarenite limestone | Calcarenite limestone |
Source: CTM (Centro Tecnológico del Mármol, Cehegín, Spain) — Reports issued May 2026. Sample ref: 263449 (Atlas Beige), 263450 (Atlas Grey).
For Architects & Specifiers
Need reports in a specific format or additional testing?
We can coordinate additional ASTM or EN testing through CTM or a US-certified lab. Contact us with your specification requirements.
See how these specifications translate to finished products: