The Short Answer
Neolith is virtually non porous and it never needs sealing. Neolith’s technical data sheet records boiling water absorption of just 0.01% to 0.1% under ISO 10545-3 across its thicknesses and finishes. In practical terms, that means liquids cannot soak into the surface, so there is nothing for a sealant to protect.
This is one of the biggest practical advantages Neolith has over natural stones such as granite and marble, which usually need sealing to resist stains. It also explains why Neolith is so hygienic and easy to keep clean.
This guide explains what porosity means, how Neolith achieves such low absorption, how it compares with other worktops and why applying a sealer is unnecessary.
0.01 to 0.1%Water absorption, ISO 10545-3
Class 5Stain resistance on most finishes
0Sealing required
No changeAfter frost testing
What Porosity Means for a Worktop
Porosity describes the tiny pores and voids inside a material. The more pores there are, the more liquid a surface can absorb. On a kitchen worktop, that matters because absorbed liquids such as oil, wine or coffee can leave permanent stains. Moisture can also provide a home for bacteria.
Water absorption testing is the standard way to measure this. Samples are soaked or boiled in water and weighed to see how much water they take on. The lower the percentage, the denser and less porous the material.
How Neolith Achieves Near Zero Porosity
Neolith is made by pressing natural minerals at up to 400 bars, which squeezes out air and packs the particles tightly together. The slabs are then fired above 1,200°C, where feldspars partially melt and flow into the remaining gaps before cooling into a dense, glassy matrix. The result is an apparent density of around 2.4 g/cm³ and almost no open pores.
Because this low porosity comes from the structure of the material itself, it does not wear away. Unlike a sealant, it does not need topping up and it is not affected by years of cleaning.
| Property | Standard | Neolith Result |
|---|
| Water absorption | ISO 10545-3 | 0.01% to 0.1% |
| Apparent density | ISO 10545-3 | 2.4 g/cm³ |
| Stain resistance | ISO 10545-14 | Class 5 on most finishes, Class 4 on Ultrasoft |
| Frost resistance | ISO 10545-12 | Not damaged |
| Thermal shock | ISO 10545-9 | Not damaged |
Maximum water absorption compared (%, lower is better)
Neolith, upper figure from data sheet0.1%
Porcelain limit for ISO 13006 group BIa0.5%
For context, the international ceramic standard ISO 13006 classifies tiles with water absorption of 0.5% or less as the lowest absorption group, commonly called porcelain. Neolith’s upper figure of 0.1% sits well within that already demanding threshold.
Enjoy a Worktop That Never Needs Sealing
See Neolith in person at our Elstow showroom and discover how easy it is to live with. Get a no obligation quote with free laser templating.
To explore the Neolith designs we supply and fit, visit our Neolith Worktops page for homeowners across Bedford and the surrounding area.
How Neolith Compares With Other Worktops
| Material | Porosity | Sealing Needed | Hygiene |
|---|
| Neolith | Near zero | Never | Excellent |
| Porcelain | Very low | Never | Excellent |
| Quartz | Very low | Never | Very good |
| Granite | Varies by stone | Periodically | Good when sealed |
| Marble | Porous | Regularly | Good when sealed |
| Solid wood | Porous | Regular oiling | Needs care |
Natural stones vary widely. Some dense granites absorb very little, while lighter and more open grained stones can absorb liquids quickly. That variation is why stone suppliers usually recommend testing and resealing periodically. With Neolith, the performance is consistent from slab to slab.
Why You Should Not Seal Neolith
Because Neolith does not absorb liquids, a penetrating sealer has nowhere to go. Applying one can leave a film or residue on the surface that looks smeary, attracts dirt and may be difficult to remove. Wax based products can have a similar effect. Neolith’s cleaning guidance focuses on simple, suitable cleaners rather than protective treatments.
No Sealing ScheduleThere is no need to test, reseal or buy specialist impregnators.
No Surface FilmsAvoid waxes and sealers that can leave smears and attract dirt.
Simple CleaningWarm water and mild detergent handle everyday use.
Neolith’s low porosity is built into the material, not applied to it. That is why it never needs sealing and why its stain resistance lasts for the life of the worktop.
Hygiene and Food Safety
A non porous surface is a hygienic surface. Food residues, liquids and bacteria cannot penetrate Neolith, so thorough cleaning is quick and effective. This is one reason sintered stone is widely used in commercial kitchens, restaurants and healthcare settings as well as homes.
For families, this means you can prepare food with confidence and clean up quickly with everyday products. Pets, children and busy cooking routines are all easier to manage on a surface that does not hold onto dirt.
Porosity, Frost and Outdoor Use
Low porosity also explains why Neolith performs so well outdoors. When porous materials absorb water and it freezes, the expansion can cause cracking and surface damage. Neolith absorbs so little water that frost testing under ISO 10545-12 showed no damage. Combined with its UV stability, this makes it a strong choice for outdoor kitchens and garden bars.
What About Joins and Sink Seals?
While the Neolith slab itself needs no sealing, the joins and silicone seals around sinks, splashbacks and upstands are separate materials. These should be kept clean and checked occasionally. Silicone may eventually need renewing, as it would with any worktop. This is normal household maintenance rather than a weakness of the material.
A careful fabricator will use suitable colour matched adhesives for joins and high quality sealant around sinks to keep water out of the cabinets below.
Common Questions About Sealing
Homeowners moving from granite or marble often ask whether they should still seal Neolith just to be safe. The answer is no. Sealing offers no benefit on a surface that absorbs almost nothing and can create cleaning problems of its own.
Another common question is whether matt or textured finishes are more porous than polished ones. The texture affects how the surface feels and how residue sits on it, not how much liquid the material absorbs. Neolith’s data sheet shows the same low absorption range across finishes, although the Ultrasoft finish is rated Class 4 rather than Class 5 for stain resistance, so prompt wiping is sensible on that finish.
People also ask whether cleaning products will eventually open up the surface. Neolith’s chemical resistance testing under ISO 10545-13 covers household cleaning products and pool chemicals, so normal cleaning will not change its porosity. The main products to avoid are those containing hydrofluoric acid.
What Low Porosity Means Day to Day
In practice, low porosity removes a whole category of worry. You do not need to rush to wipe up a splash of red wine during a dinner party, test the surface with drops of water to see if it needs resealing or buy specialist impregnating products. The worktop simply stays as it was on the day it was installed.
It also saves money over time. Natural stone sealing products and professional resealing visits add up over the years, while Neolith needs nothing more than the everyday cleaning products you already own.
Explore Related Guides
To see how low porosity translates into everyday spill resistance, read Does Neolith Stain for advice on specific marks. For a complete cleaning routine, our guide How to Care for Neolith Worktops covers daily wipes, deep cleans and products to avoid.
If you are weighing up a natural stone that does need sealing, Neolith vs Granite compares the long term maintenance of the two materials.
Neolith Worktops Guide
This article is part of our complete Neolith worktops guide, covering materials, costs, comparisons, care and the full buying process for homeowners.
Explore the Full Guide
For answers on every aspect of choosing Neolith, the Neolith Worktops Guide brings all of our articles together in one place.
Talk to Our Team
If a low maintenance, hygienic worktop is high on your list, Neolith is well worth a closer look. Visit our 200 square metre showroom in Elstow to explore designs and take samples home to test in your own kitchen.
Call us on 01234 348 590 or request a quote online and we will provide a clear, fixed price with 0% finance available.
