Silica in Kitchen Worktops: Which Worktops Contain It and How Much?

Most natural stone and many engineered stone kitchen worktops contain some crystalline silica, but the amount can vary significantly between materials. Traditional engineered quartz is generally at the higher end, while marble, limestone and some newer engineered surfaces can contain much lower levels.

For homeowners, the important distinction is between silica contained within a finished worktop and respirable crystalline silica dust created when a material is cut, ground or polished. An installed worktop is not normally producing respirable silica dust during everyday kitchen use.

This guide compares the typical silica content of common kitchen worktop materials, explains why quartz is considered a high-silica surface, and shows where lower-silica alternatives fit into the market.

What is crystalline silica?

Crystalline silica is a naturally occurring mineral found in many rocks, stones, sands and clays. Quartz is one of the most common forms of crystalline silica, which is why the word silica often appears when discussing quartz, granite, sandstone and other stone products.

The silica contained inside a solid worktop is different from respirable crystalline silica, often shortened to RCS. RCS refers to extremely fine particles of silica-containing dust that can be breathed deep into the lungs.

This fine dust can be produced when silica-containing materials are cut, drilled, ground or polished. For worktop fabricators, this means the main exposure risk occurs during manufacturing and installation work rather than from simply touching or using a finished surface.

The Health and Safety Executive sets a workplace exposure limit for respirable crystalline silica of 0.1 mg/m³ as an 8-hour time-weighted average. Work involving engineered stone must therefore use appropriate controls to reduce exposure.

Silica should also not be confused with silicone. Silica is a mineral found naturally in stone. Silicone is a synthetic material commonly used in sealants and adhesives.

Which kitchen worktops contain silica?

Quartz, quartzite, granite and many other stone-based worktops contain crystalline silica, but not at the same level. The composition can vary between individual products, colours, slabs and manufacturers, so technical documentation should always be checked where an exact percentage is important.

If you are comparing a silica based kitchen worktop with a lower-silica alternative, the table below shows how the main materials differ.

Worktop material	Typical crystalline silica level	What to know
Traditional engineered quartz	Very high, commonly around 90% or more in traditional formulations	Crushed quartz has traditionally been a major component of engineered quartz surfaces. Newer reduced-silica formulations are increasingly available.
Quartzite	High, HSE lists quartzite at more than 70%	Quartzite is a natural stone and can contain a very high proportion of silica.
Granite	Variable, HSE lists granite at up to around 30%	Silica content varies according to the geological composition of the individual stone.
Sintered stone	Varies by product and colour	Sintered surfaces can contain crystalline silica. Current manufacturer technical data should be checked before comparing individual products.
Porcelain and ceramic	Varies	The composition differs significantly between products. Check the manufacturer’s current technical information if silica content is an important specification.
Marble and limestone	Low, HSE lists limestone and marble at up to around 2%	These stones are primarily calcite-based, although natural variations and silica-containing layers can occur.
Solid surface and acrylic worktops	Usually low or minimal crystalline silica	Composition varies by brand, so the current manufacturer specification should be used for an exact comparison.
Laminate and timber	Effectively no crystalline silica in the main worktop material	These are not stone-based surfaces and are useful comparison points when silica content is the primary concern.
Stainless steel	No crystalline silica in the worktop material	A non-stone option commonly used in professional and contemporary kitchens.
Zero and lower-silica engineered surfaces	Varies from 0% upwards depending on product	Newer engineered surfaces are available with substantially reduced or zero crystalline silica specifications. See our zero and low silica worktops guide for the current UK options.

Important: These figures are general material comparisons rather than specifications for every individual product. Natural stone varies by slab and engineered products can change by range, colour and formulation. Always check current manufacturer technical documentation where an exact crystalline silica percentage is required.

How much silica is in quartz worktops?

Traditional engineered quartz worktops are among the highest-silica materials commonly used for kitchen surfaces. This is because crushed quartz has historically formed a large proportion of the material, combined with resin, pigments and other ingredients to create a dense engineered slab.

This differs from natural granite. Granite contains crystalline silica too, but its mineral structure contains a mixture of quartz, feldspar, mica and other minerals. HSE lists granite as containing up to around 30% silica, while traditional engineered quartz formulations can contain considerably more.

That difference matters mainly during fabrication. Cutting and polishing a higher-silica material can create dust containing a greater proportion of crystalline silica if suitable controls are not used.

The market is now changing. Manufacturers have introduced engineered surfaces with substantially reduced crystalline silica levels, including some products specified below 10% and others designed with no crystalline silica content.

If reducing silica content is important to your specification, see our detailed guide to low silica quartz worktops and other lower-silica surfaces available in the UK.

What are high silica worktops?

High silica worktops are surfaces containing a relatively large proportion of crystalline silica. Traditional engineered quartz and natural quartzite are the main kitchen worktop materials that fall into this broad description.

There is no single HSE consumer classification that officially defines a worktop as “high silica” at a particular percentage. In this guide, we use the term descriptively to help compare materials with very different compositions.

The subject has received increasing regulatory attention because respirable crystalline silica dust can be generated when these materials are processed.

In Britain, HSE sets a workplace exposure limit for RCS of 0.1 mg/m³ averaged over eight hours. HSE’s current engineered stone guidance also requires businesses to control exposure through measures including lower-silica materials, water suppression, suitable respiratory protective equipment and other appropriate controls.

Australia introduced a prohibition on the manufacture, supply, processing and installation of defined engineered stone benchtops, panels and slabs from July 2024. Under the Australian definition, qualifying engineered stone contains at least 1% crystalline silica, although specific products including certain porcelain and resin-free sintered stone materials are excluded from that definition.

As of 2026, there is no UK ban on engineered stone. HSE’s current approach focuses on controlling workplace exposure to respirable crystalline silica, including its May 2026 guidance against dry cutting of engineered stone.

Is silica in a worktop dangerous in your home?

Available evidence indicates that an installed worktop does not present a silica-dust risk during normal household use, provided that the surface is not being cut, ground or polished.

Crystalline silica becomes an occupational health concern when very fine dust is generated and inhaled. That is why fabrication processes such as cutting, drilling, grinding and polishing receive the greatest attention from health and safety regulators.

Safe Work Australia similarly advises that engineered stone already installed in a home or workplace does not pose a safety risk provided it is not processed. Risks may arise again if the surface is cut, repaired, modified or removed in a way that generates dust.

For that reason, homeowners should not attempt to cut or grind stone worktops themselves. Alterations should be carried out by an experienced fabricator using the appropriate dust-control methods.

As fabricators, we cut and polish stone and engineered surfaces ourselves, so silica content is not simply a marketing specification. It forms part of how a material should be assessed and handled during fabrication.

High silica vs low silica vs zero silica worktops

Silica content in worktops can be understood as a spectrum rather than a simple yes or no question. For comparison on this page, we use the following broad descriptions. These are editorial categories for explaining the market, not official HSE classifications.

High silica worktops

Traditional engineered quartz and quartzite can contain high proportions of crystalline silica. These surfaces require particularly careful control of dust when they are fabricated.

Lower-silica worktops

Some newer engineered stone ranges have been reformulated to contain substantially less crystalline silica than traditional quartz. Exact specifications vary by manufacturer and product.

Zero crystalline silica worktops

A newer category of engineered surfaces is designed with 0% crystalline silica. This does not mean that fabrication dust from any material should be treated as harmless. Appropriate dust controls remain important whenever a worktop is cut, drilled or polished.

Looking for a lower silica worktop?

If you want the appearance and performance of an engineered stone surface but want to compare lower-silica specifications, our guide to zero and low silica worktops covers the available options in more detail, including brands, specifications and buying considerations.

You can also use our Help Me Choose My Worktop guide if you are comparing materials for a new kitchen project.

Silica in worktops: common questions

Does granite contain silica?

Yes. Granite contains crystalline silica, although the percentage varies according to the individual stone. HSE lists granite as containing up to around 30% silica. This is generally much lower than traditional engineered quartz, but granite still requires appropriate dust controls when it is cut or polished.

Do laminate or wooden worktops contain silica?

Laminate and timber worktops effectively contain no crystalline silica in the main worktop material. They are not stone-based surfaces, so they provide useful comparison options for homeowners whose main concern is the crystalline silica content of the worktop itself.

Is Dekton silica free?

No blanket assumption should be made that Dekton or another sintered surface is silica free. Crystalline silica content can vary between products and colours. Check the current manufacturer’s technical documentation for the specific surface before relying on a silica percentage.

Is silica the same as silicone?

No. Silica is a naturally occurring mineral found in stone, sand and many other materials. Silicone is a synthetic polymer commonly used in sealants and adhesives. The similar names cause confusion, but they are completely different materials.

Can silica be removed from or sealed into a worktop?

No. Crystalline silica forms part of the material itself rather than sitting on the surface as a coating. Sealing a stone worktop does not change its silica content. An installed worktop does not normally release respirable silica dust during everyday use unless it is cut, ground or polished.