What Is A Quartz Worktop
What Is Quartz Made Of
Ground natural quartz crystals, polymer resin and pigments. Here is the exact composition and what each ingredient does.
Table of Contents
Quick Answer
A quartz worktop is made from three ingredients: 90–94% ground natural quartz crystals (silicon dioxide, the mineral that provides Mohs 7 hardness), 5–8% polymer resin (polyester or acrylic, the binder that makes it non-porous) and 1–2% colour pigments (for colour and pattern). The quartz mineral is natural. The resin and pigments are synthetic. The resin is both the hero (creating the non-porous, stain-proof surface) and the limitation (causing the ~150°C heat sensitivity).
Composition Breakdown Table
| Ingredient | Percentage | Natural or Synthetic | What It Provides |
|---|---|---|---|
| Ground Quartz | 90–94% | Natural (mined) | Hardness (Mohs 7), scratch resistance, stone character, weight |
| Polymer Resin | 5–8% | Synthetic | Binding, non-porosity, stain resistance, colour depth |
| Colour Pigments | 1–2% | Synthetic | Colour, veining patterns, decorative effect |
| Optional Additions | 0–2% | Varies | Recycled glass, mirror particles, metallic flecks |
The Quartz Mineral (90–94%)
Quartz (silicon dioxide, SiO₂) is the second most abundant mineral in the Earth's crust after feldspar. It is found in almost every geological environment and is 100% natural. The quartz used in worktop manufacturing is mined from quarries, cleaned to remove impurities and ground into particles of varying sizes from fine powder to coarse granules.
The quartz content is what gives a quartz worktop its defining properties. At Mohs 7 hardness quartz is harder than steel (5–6.5), glass (5.5) and even most types of granite (6–7). This hardness is distributed uniformly across the surface because the particles are mixed evenly during manufacturing. Unlike natural granite which has softer mineral inclusions that create weak spots every point on a quartz worktop has the same hardness.
The particle size mix matters. Manufacturers blend coarse, medium and fine quartz particles to achieve optimal density. Coarser particles provide structural strength. Finer particles fill the gaps between larger ones. This graduated particle approach is what allows the vacuum compaction process to achieve near-zero porosity.
The Resin Component (5–8%)
The polymer resin is the ingredient that transforms loose quartz particles into a solid, non-porous slab. Most manufacturers use unsaturated polyester resin. Some premium brands use acrylic resin which can offer slightly better UV resistance and flexibility. The resin serves three critical functions.
Binding. The resin bonds the quartz particles together into a rigid solid mass. Without it the ground quartz would be loose powder. The resin cures (hardens permanently) during the heat treatment stage of manufacturing.
Non-porosity. The resin fills every microscopic gap between quartz particles. Combined with the vacuum compaction process this achieves a water absorption rate below 0.05%. This is what makes quartz effectively non-porous and why it never needs sealing.
Colour depth. Light passes through the transparent resin slightly differently than it would through air gaps creating a visual depth and luminosity. This is particularly noticeable in polished finishes where quartz has a warmth and richness that resin-free surfaces like Dekton and porcelain cannot fully replicate.
The resin is also responsible for quartz's one significant limitation: heat sensitivity. Polyester resin softens at approximately 150°C. This is why hot pans from the hob or oven must be placed on trivets rather than directly on quartz. It is also why bleach can damage the resin component.
Pigments and Additions (1–2%)
Colour pigments are added to create the vast range of colours available. From pure whites to deep blacks and every shade in between pigments make quartz the most design-flexible stone worktop material. For veined designs additional pigmented materials are introduced during mixing to create the marble-effect vein patterns.
Some manufacturers add optional materials for decorative effect: recycled glass pieces for sparkle, mirror particles for shimmer or metallic flecks for a granite-like appearance. These additions are typically less than 2% of the total composition and do not significantly affect the physical properties. Some eco-conscious brands use recycled content to reduce the environmental impact of manufacturing.
How Composition Affects Performance
| Property | Provided By | How It Works |
|---|---|---|
| Scratch Resistance | Quartz mineral (Mohs 7) | Silicon dioxide is harder than steel knives |
| Non-Porosity | Resin + vacuum compaction | Resin fills all gaps, vacuum removes all air |
| Stain Resistance | Non-porosity (resin) | No pores for liquids to penetrate |
| Colour Variety | Pigments + resin | Pigments distributed evenly through resin matrix |
| Heat Limitation | Resin (~150°C limit) | Polyester resin softens at high temperatures |
| UV Sensitivity | Resin (degrades in UV) | UV breaks down resin bonds causing yellowing |
| Visual Depth | Resin (light transmission) | Light enters resin slightly, creating luminosity |
The Resin Paradox
The polymer resin is both the hero and the limitation. It creates the non-porous, stain-proof, colour-rich surface that makes quartz so popular. It also creates the heat and UV sensitivity that are quartz's only significant drawbacks. Resin-free alternatives like Dekton solve the heat issue but lose the colour depth and warmth that resin provides. For most homeowners the resin's benefits dramatically outweigh its limitations.
See What Quartz Is Made Of Up Close
Visit our Bedford showroom to see and feel quartz samples in person. Free expert advice.
Now you know what goes into every quartz worktop. Visit our quartz worktops Bedford page to explore the range and request a free quote.
Frequently Asked Questions
What is a quartz worktop made of?
90–94% ground natural quartz crystals, 5–8% polymer resin and 1–2% colour pigments. Some designs include recycled glass or metallic flecks.
What is the resin in quartz worktops?
Typically polyester or acrylic polymer resin. It bonds the quartz particles, creates the non-porous surface and is responsible for both the stain resistance and the ~150°C heat limitation.
Is the quartz in worktops natural or synthetic?
The quartz mineral is 100% natural (mined from the earth). The resin and pigments are synthetic. A quartz worktop is a combination of natural mineral and synthetic binders.
Does the composition affect performance?
Yes. High quartz content provides hardness and scratch resistance. Resin provides non-porosity and stain resistance but also creates heat and UV limitations.
Related Articles
What Is A Quartz Worktop
The complete beginner's guide to quartz worktops.
Is Quartz A Natural Stone
The natural vs engineered distinction explained.
Is Quartz Environmentally Friendly
The environmental impact of quartz manufacturing.
Have More Questions About Quartz?
Browse our complete library of quartz worktop FAQs answered by our Bedford specialists.
This article is part of our growing Quartz FAQs hub where we answer the most common questions Bedford homeowners ask about quartz worktops. If you cannot find the answer you need feel free to call us on 01234 348590 or email info@preciousmarble.co.uk.
Leave a Reply
Want to join the discussion?Feel free to contribute!