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How is your stone tested?

System Administrator posted this on 12 Apr 2019

Natural Paving's stone has been tested by a lab in the US and has far surpassed all ASTM requirements for paver material.

The most recent tests completed on the Classicstone range included:

  • PSI (Compressive Strength ASTM C140-15), scored an average value of 15,260. The is the amount of pressure per square inch that may be applied before the stone breaks
  • Absorption Rate (ASTM C140-15), scored an average value of 1.2%. This is a very good value as a low absorption rate is crucial to prevent the stone holding onto water, especially in colder climates.
  • Coefficient of Friction Rate (ASTM C140-15), scored within a range of 1.46 when dry and 0.94 when wet.

ASTM logo

Furthermore, all products from Natural Paving are CE marked to ensure they meet with strict EU regulations that were introduced in 2013. European standards EN1341 (flagstones), EN1342 (pavers) and EN1343 (kerbs) specify the requirements and test methods for each of these. The CE testing covers areas similar to ASTM including water absorbency, flexural strength and frost resistance.

All natural stone products have been tested to show the various properties of each stone and how it is likely to react under different circumstances.

ASTM test engineer

ASTM testing

ASTM testing blocks