Turning Stone Into Style: The Making of Quartz Countertops
Quartz countertops are engineered, not quarried — here's what that means, how they're made, and what it means for your kitchen.
By Precision Granite Works Team · Precision Granite Works, Epsom NH
Engineered vs. Natural: What the Difference Actually Means
Quartz countertops are often called "engineered stone" — a term that distinguishes them from natural stone (granite, marble, quartzite) that comes directly from the earth. Engineered quartz is manufactured: ground quartz crystals and other aggregates are combined with polymer resins and pigments, compressed under high pressure, and cured to create a dense, consistent slab that can be fabricated and installed like natural stone.
This matters because engineered and natural stone have different strengths. Quartz's engineered nature gives it advantages natural stone doesn't have — consistent patterning, non-porosity, no need for sealing. Natural stone's geological origin gives it advantages quartz can't replicate — genuine uniqueness, depth, and the authenticity of a material formed by the earth.
The Manufacturing Process
A typical quartz slab is approximately 93% ground quartz aggregate and 7% polymer resins and pigments. The quartz aggregate can be ground to different particle sizes — finer particles produce a smoother, more uniform appearance; coarser particles create visible texture and sparkle. Pigments and sometimes mirror chips, glass, or other additives create the color and pattern.
The mixture is poured into a mold and compacted under vacuum pressure to remove air, then cured in an oven. The result is an extremely dense, non-porous slab. Slab surfaces are then ground and polished to the specified finish. Unlike natural stone slabs, quartz slabs are highly consistent — if you select a specific pattern, the next slab of that pattern will look essentially identical.
The Non-Porosity Advantage
Because quartz is manufactured under high pressure with resin binding the aggregate, it's inherently non-porous. This means it doesn't absorb liquids, doesn't stain the way natural stone can, and never requires sealing. For households with young children, busy cooks, or homeowners who simply don't want to think about annual maintenance, this is a meaningful practical advantage.
The Heat Limitation
The resin component that makes quartz non-porous also creates its main limitation: heat resistance. The polymer resins can warp, discolor, or crack under sustained high heat from hot pans, slow cookers placed directly on the surface, or instant hot water dispensers. Trivets are not optional with quartz — they're required. If you frequently move hot pans between the stove and counter, this is a real consideration in the natural vs. engineered stone decision.
Want to compare quartz and natural stone samples in person? Visit our showroom at 1022 Dover Road, Epsom, NH. Call 603-736-0004 or reach out online.
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About the Author
Written by the team at Precision Granite Works — New Hampshire's family-owned countertop fabricators. Jillian and Shawn Woodward and their team serve homeowners and builders across all of NH from our Epsom showroom.