What is Quartz Countertops Made Out of?

Quartz countertops have become an increasingly popular option for kitchen and bathroom renovations in recent years. But what exactly are these countertops made of? Here’s a detailed look at the composition and manufacturing process of quartz countertops.

What is Quartz?

Quartz is a mineral that is found abundantly in nature. It is composed of silicon and oxygen atoms and is one of the hardest minerals on Earth. Natural quartz is crystalline in structure and translucent to opaque in appearance. For countertops, quartz is ground into a fine powder and then combined with materials to make an engineered stone.

Engineered Quartz Countertops

Engineered quartz countertops are made from about 90% ground natural quartz aggregates combined with polyester resins and pigments. The exact ratio and compounds vary between different manufacturers. Here are the basic ingredients:

Quartz Aggregates

  • Finely ground quartz makes up about 90% of a quartz countertop by weight. The quartz is ground into a fine powder to bind seamlessly with the other materials.


  • Epoxy or polyester resins make up about 10% of the material by weight. They bind the quartz particles together to form a solid, cohesive slab.


  • Pigments are added to the mix to achieve the desired color and pattern. Common pigments include iron oxide for red, chromium oxide for green, and titanium dioxide for white.

Other Additives

  • Small amounts of other additives like recycled glass or shells may be added for decorative effects. Concrete polymers help enhance the strength.

The Manufacturing Process

Quartz countertops are made in factories under closely monitored conditions to produce consistent quality and appearance. Here is the step-by-step manufacturing process:

  1. Mixing: The ground quartz, resins, pigments, and other additives are combined in precise proportions and mixed together.
  2. Molding: The mixture is poured into molds and compacted under vibration and vacuum conditions to remove air pockets.
  3. Curing: The molded slabs are cured in ovens under heat and pressure. The resins polymerize and solidify to produce a hard, stable surface.
  4. Finishing: The finished slabs are cooled, polished, and given the desired edge and surface finish.
  5. Fabrication: The slabs are cut to the specifications required for installation, including cutouts for sinks etc.
  6. Installation: The fabricated countertop pieces are installed permanently in homes and businesses using adhesive and seam joining techniques.

Benefits of Quartz Countertops

Understanding the manufacturing process helps illustrate some of the key benefits that quartz countertops offer:

  • Durability: Quartz is highly resistant to scratches, stains, burns, and damage. The resin binders create a surface even harder than natural stone.
  • Low maintenance: Quartz requires very little maintenance compared to other surfaces. Simple wiping with a soft cloth keeps it clean.
  • Appearance: Quartz can mimic natural stone as well as come in bold, consistent colors and patterns. The range of options is immense.
  • Hygienic: The non-porous surface inhibits bacterial growth and is ideal for kitchens and bathrooms.
  • Consistency: The manufactured nature of quartz results in very consistent coloring and patterning compared to natural stone.
  • Eco-friendly: Many manufacturers use recycled content and eco-friendly processes to produce quartz slabs.

Is Quartz Natural Stone?

While made primarily from a natural mineral, quartz countertops are engineered in factories – not naturally formed stones. The manufacturing allows the creation of consistent, durable surfaces that do not occur in nature. They have some, but not all qualities of natural stone countertops like marble or granite. The combination of natural quartz aggregates and polymers yields a versatile, high-performance material.

FAQs About Quartz Countertops

Is quartz poreous?

No, quartz is non-poreous because of the resin binders filling any spaces between the quartz particles. This prevents liquids and debris from penetrating the surface.

Can you scratch quartz countertops?

Quartz is highly scratch resistant. But excessive force with sharp objects can damage the surface. Avoid using knives directly on the counter.

How thick are quartz countertops?

Quartz countertops are typically 0.8 to 1.2 inches thick for home installations. Thicker slabs of up to 2 inches are also available for heavy commercial use.

Can quartz countertops crack?

Quartz slabs are quite flexible and resist cracking from normal kitchen and bathroom use. But excessive force or improper installation can cause cracks in a quartz countertop.

How heavy are quartz countertops?

Quartz countertops weigh between 15 to 20 pounds per square foot, making them heavier than some natural stone and solid surface options. Proper cabinet support is vital.

How long do quartz countertops last?

With proper care and maintenance, quartz countertops typically last for many decades in homes. Their longevity and durability are big selling points.


Quartz countertops offer a unique engineered surface made mainly from ground quartz aggregates combined with polymers and pigments. The manufacturing process allows for an ideal countertop material that is hard, durable, consistent, and available in myriad styles. For home or business owners considering new countertops, quartz provides an excellent balance of performance, aesthetics, and practicality compared to other options on the market today.