March 5th, 2019 | Stone & Tile
Limestone Benchtops — Cleaning & Sealing Tips
Limestone presents some very challenging scenarios when used as a benchtop. It is important to understand this in view of your communication with your client so that their expectations are realistically aligned with the limitations of the stone. These can be summarized as follows:
Acid Sensitivity – Limestone typically contains at least 50% calcite or calcium carbonate content and is of biological origin. This composition means that it is the most sensitive of all natural stone types to acid attack. In the case of a bench top this relates to sauces, wines, beverages, lemons, many fruits and vinegar
Absorption – Limestone has an absorption rate from as low as 0.6% to as high as 30%. Normally limestone absorption is 3% to 12% .
Ability to be sealed – Limestone, because of it’s inert calcite structure is widely regarded as the most difficult stone to seal. Actichem have developed a unique water repellent penetrating sealer namely Defender CSD50 which is highly recommended for wet areas or outdoor use.
To preserve the natural appearance, texture and colour of stone, mostly they are sealed with sub- surface, penetrating sealers. These special protective treatments also allow the stone to “breathe”. The limitations of penetrating sealers is that they do not provide “bullet-proof” protection. The provide a powerful oil and water repellent surface which holds staining agents out of the stone. However, some staining agents if not removed can still create permanent staining. In contrast film forming sealers change the texture and appearance of natural stone but provide a total block to staining agents.
It should be noted that
Defender CSD50 and Solv Sealer Gold combination
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