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"quartz" countertops are engineered stone

The various products termed "quartz" countertops would be more accurately termed "engineered stone" which is what they were called before the manufacturers made the marketing decision to present the product as "pure and natural". In actual fact the various engineered stone products are produced on high tech manufacturing lines in a multi-stage process. The petrochemical based resins are mixed with the various inclusions including but not limited to quartz chips and the resulting "dough" is extruded into trays. The trays then go into a energy intensive high temp oven where the resin is cured. Incomplete mixing of the dough is the source of the so called "resin pools" which are flaws in the mixture which a quality conscious fabricator will work around. The dough mixing process is inherently random and individual for each slab so the mirror image paired slabs available in natural stone is not an option in engineered stone.


After the dough is cured and cooled the resulting slabs go into a 2nd process where they are polished in much the same manner as actual natural stone slabs on a conveyor through progressively finer polishing grits. The "depth of the shine" on an engineered stone is noticeably less than a natural stone because the resin does not polish up to the same reflectivity as stone. This difference is immediately obvious when a natural stone color is side by side to it's engineered stone imitator.


Problems occur when the slabs are cured improperly which results in slabs which crack easily, often during the initial sawing process at the fab shop. Such problems are relatively rare with slabs from major engineered stone manufacturers as they have had many years to refine their processes.



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