22195 Fisher Hollow Road
Damascus, VA 24236
(276) 475-5774
fax (276) 475-6568
Slate is
metamorphic rock, like marble. However, instead of forming from a
pre-existing limestone (like marble), slate is formed from the low-grade metamorphism
of the sedimentary rock shale. Slate, like shale ("mudstone"), is a
very fined-grained rock of mostly microscopic clay minerals with some
microscopic quartz and calcite. Slate can also contain some of the same
minerals found in granite, which make some slates iridescent and/or hard. The
alteration of shale by heat and pressure produces the pronounced partings
(slaty cleavage) that give slate its characteristics. Like limestone and
marble, the color comes from trace metals. The wild colors on most Chinese and
Indian slates are the result of splitting the slate along natural layers, which
exposes the metals to the atmosphere, and they oxidize (rust).
Most commonly asked questions about care and cleaning of natural stone.
·
Question: Should the natural stone we have selected for our home
or workspace be sealed?
·
Answer: Yes, all natural stone should be sealed. This includes granite,
marble, limestone, sandstone, slate, travertine, and onyx
·
Question: What should stone be sealed with?
·
Answer: There are basically two kinds of sealers. Impregnating
sealers are absorbed, leaving an invisible barrier of silicone in the pores of
the material making it difficult to stain. Stone Protect made by Stone Medic is
easy to apply and is a high quality impregnator. Color enhancing sealer can be
used on textured stones (i.e. slate, tumbled stone, sandstone, etc.). The
enhancer will deepen the color of the material, making it look wet but with a
matte finish. SIM Enhancer is easy to apply and maintain.
·
Question: How is sealer applied?
·
Answer: Application is simple, when using Impregnators, a white cotton
cloth or lambs wool applicator should be moistened with the sealer and wiped
evenly over the surface. Streaks or puddles are an indication that the product
is too heavy and should be spread over a larger area. SIM Color Enhancer is
best applied with a disposable paintbrush to allow proper coverage over the
textured surface. For best results, two coats should be applied (three on
limestone) and spaced ten minutes apart. After the final application, the
entire area should be buffed with a clean dry cloth to remove any excess
product from the surface.
·
Question: What cleaning product should be used on natural stone?
·
Answer: Stone Soap (manufactured by Stone Medic) is the best general
purpose cleaner available. It is a liquid concentrate and can be used to damp
mop a floor or spray and wipe a counter top or wall.
·
Question: How often should sealer be reapplied?
·
Answer: Stone Protect will provide about four years protection if
stone soap is the only cleaning product used.
The Marble Institute of America offers a brochure
that includes information on treating spills and stains on natural stone
surfaces. For a copy, please send $1.00US along with a self addressed, stamped
business size envelope (37 cents) to the Marble Institute of America, 28901
Clemens Road, Suite 100, Cleveland, Ohio 44145 USA.