Porcelain Slabs UK: The Complete Trade Guide
What is a porcelain slab?
A porcelain slab is a large-format sheet of dense, kiln-fired ceramic, engineered from refined clays and mineral pigments heated to temperatures above 1,200°C. The result is a virtually non-porous surface that is scratch-resistant, UV-stable, heat-resistant and incredibly hygienic — suitable for everything from kitchen worktops to ventilated facades. Clay International supplies and distributes Infinity porcelain slabs to trade professionals such as stone fabricators, building contractors and developers. Infinity slabs are exclusively produced in Italy and Clay International is the brand’s sole UK distributor.
Sizes and thicknesses
- Slab formats up to 3200mm x 1600mm depending on thickness and production runs — among the largest available in the UK, allowing worktops and cladding with minimal joints and full bookmatching if required.
- 6mm — lightweight cladding, wall panelling, furniture and door faces.
- 12mm — the all-rounder for worktops and heavy-use horizontal surfaces.
- 20mm — solid-feel worktops, islands and outdoor kitchens. The preferred thickness for stone fabricators in the UK.
Finishes
Infinity Surfaces slabs come in polished, satin, Levigato Pearl and matte finishes across marble, stone, concrete, metal and plain-colour effects. Finish choice affects both aesthetics and practicality — our Finishes & Edges guide covers slip resistance, sheen and edge-profile options including mitred, bullnose, chamfered and pencil-round edges.
Where porcelain slabs are used
- Kitchen worktops and islands — heat-resistant, stain-resistant, food-safe.
- Bathrooms and wetrooms — large formats mean fewer grout lines.
- Flooring — hard-wearing across residential and commercial spaces.
- Fireplace surrounds and feature walls — dramatic bookmatched veining.
- Facades and external cladding — UV- and frost-stable.
- Furniture and joinery — 6mm slabs for tables, doors and panels.
See our End Uses guide for the full picture.
Porcelain vs quartz, granite and sintered stone
Compared with quartz, porcelain is UV-stable (no yellowing in sunlight), heat-resistant to very high temperatures and usable outdoors. Compared with granite and marble, it is non-porous, needs no sealing and offers consistent veining. Sintered stone brands such as Dekton and Neolith share many of these properties — the differences come down to composition, format range, price and availability. What sets Clay International apart from any brand is stock: slabs are held physically in our UK warehouses, and regular deliveries from Infinity in Italy reduce waiting times for non-UK stock items.
For architects and designers
We support A&D practices with CPD sessions on large-format porcelain specification, technical data for every range, and warehouse viewings where you and your clients can inspect full slabs — not just samples — before committing to a product. Our team’s fabrication and installation background supports the specifier in how the material is cut and fitted on sites and in factories.
Visit a warehouse
See full slabs at Hub 1, Unit 29, Wimbledon Stadium Centre, Riverside Road, London SW17 0BA, or Unit 6B, Kayley Industrial Estate, Ashton-under-Lyne, Manchester OL7 0AU. Open Monday to Friday 7:30am–4:30pm and Saturday mornings — all viewings are by appointment only. Call +44 (0)20 8971 7948 or email info@clayinternational.co.uk. The Wimbledon branch also has a showroom where samples and finished works can be viewed. Find out more on our Where to Buy page.
Frequently asked questions
Who supplies Infinity Surfaces in the UK?
Clay International is the sole UK distributor of Infinity Surfaces large-format Italian porcelain slabs, supplying fabricators, kitchen studios, architects and designers nationwide.
Can I visit and see full slabs?
Yes — both warehouses welcome trade professionals and their clients. All visits are by appointment only, so please call before visiting.
Do you deliver nationwide?
Yes, we deliver nationwide with no minimum order. Delivery charges reflect our logistics costs, and lead times vary depending on availability of stock and vehicles.
What is the largest slab size available?
Up to 3200mm x 1600mm depending on slab thickness and production runs.