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Stevensons-Stone® Technical Specification

Stevensons-Stone® is a Jesmonite based product.

Jesmonite is a rapid setting acrylic polymer modified cement based composite. It is a shrinkage-compensated material of low permeability and is durable in all conditions of external weathering.

The compound is alkali free and as such is free from the efflorescence associated with ordinary Portland cement based systems. The product contains a fine decorative aggregate and powder pigments, carefully controlled to give a consistent decorative surface finish after treatment with a proprietary brick cleaner or acid etch.

The properties of Jesmonite AC730 based Stevensons-Stone®:

  • Water update/porosity BS EN1170-6 2.26%
  • Freeze thaw resistance DD CEN/TS 12390-9 300 cycles (normal max 56 cycles)
  • Fire resistance BS EN 13501-1 A2-s1-d0
  • Dimensional stability BS EN 1170-7 Shrinkage = 0.83/Expansion = 1.28
  • Weathering/durability BS EN ISO 4982 1008 Hrs
  • Compressive strength BS EN 12390-3 58Mpa (N/mm2)
  • Flexural strength BS EN 1170-5 LOP 8.9Mpa – MOR 23.6Mpa

Key attributes of AC730 based Stevensons-Stone®:

  • Improved flexural strength and stability
  • Excellent abrasion resistance and impact strength
  • High compressive and tensile strength
  • Rapid curing and high early strength gain
  • Shrinkage compensated and dimensionally stable

The key benefits of using Stevensons-Stone®:

  • Stronger: Strong, flexible and more durable, making it high impact resistant
  • Lighter: Lighter than stone, glass-reinforced concrete and sand & cement products
  • Finer: Replicates the very finest detail
  • Safer: Fire resistant with an EN 13501-1 A2-s1-d0 fire rating, reduced smoke density and toxicity characteristics. Solvent free with no VOCs.
  • Greener: Water-based not solvent-based making it kinder to the environment
  • More choice: Can be pigmented to any colour or RAL reference and can authentically replicate the appearance and texture of natural stone.