UKAS Stone Testing

Sandberg offer UKAS accredited stone testing for a comprehensive range of British (BS EN), American (ASTM), withdrawn standards (for historical comparison investigations) and documented in-house stone testing methods.

Stone testing accreditation is held for over 60 no. stone testing methods and procedures which cover the following physical and mechanical parameters.

  • Petrographic description
  • Petrographic examination
  • Density (apparent and real)
  • Porosity (open and total)
  • Water absorption at atmospheric pressure
  • Water absorption coefficient by capillarity
  • Microporosity
  • Saturation coefficient
  • Compressive strength
  • Modulus of rupture (3-point)
  • Flexural strength (4-point)
  • Frost resistance
  • Salt crystallisation
  • Thermal shock resistance
  • Sulphur dioxide exposure
  • Acid immersion
  • Sensitivity to changes in appearance produced by thermal cycling
  • Sound speed propagation
  • Static elastic modulus
  • Dynamic modulus of elasticity
  • Linear thermal expansion coefficient
  • Abrasion resistance (wide wheel)
  • Abrasion resistance (lapping plate)
  • Slip resistance (pendulum)
  • Polished paver value
  • Breaking load at dowel hole
  • Microcrack dye testing


  • Petrographic examination
  • Dimensions
  • Water absorption
  • Bending strength
  • Wetting & drying
  • Acid immersion
  • Thermal cycling
  • Freeze/thaw resistance
  • Sulphur dioxide exposure

The selection of material for stone testing is critical, as it must be representative of the material to be produced and supplied. Sandberg can offer independent expert advice and sampling services by qualified geologists / stone consultants for stone testing to ensure that representative and traceable samples are obtained.

On completion of stone testing, Sandberg is able to provide an independent expert opinion on the results.

David Ellis

For further information contact: David Ellis, Partner
Direct Tel: 020 7565 7065
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

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