Slate Stone Maintenance

Composition: Muscovite Chlorite (wide variation in composition)
Hardness : Soft - easily scratched
Absorption : Low - medium oil, water other liquids
Limitations : Absorbs oils/ liquids, cleft planes can spall
Sealer : Sub-surface repellents oil repellent type recommended
Cleaner: Neutral pH detergent or pure soap
Finish: Acrylic OK - wax OK
Notes: Cleft slate is very durable in most situations but quality varies. Slate is typically rustic in appearance but some milled or smooth products are available in some varieties. Wear is typically taken on the peaks or high spots of the textured surface. Acrylics are used when a highly reflective finish is desired. Excellent exterior paving stone. Higher absorbency varieties may not be suitable for exterior areas in freezing climates.
Slate characteristics vary with source. Domestic is typically black, green or mottled (Pennsylvania) and is relatively dense. Many imported slates are available today with wide ranging physical characteristics and overall suitability. Evaluate your stone for density, tensile strength, absorbency and abrasion resistance. Make sure your slate characteristics are compatible with the intended function.

More resources:
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