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Inspection in progress under controlled light

Quality & Traceability

Every block, slab and lot carries a record. On a natural material, that record is most of the product.

Three slabs of the same material showing uniform, moderate and substantial variation

Variation

V1, V2, V3 — a description, not a ranking

Variation grades describe how much the veining and the background tone move across a lot. V1 is uniform, V2 moderate, V3 substantial. A V3 material is not lower quality than a V1 — it is a different design proposition, and frequently the more expressive one.

What matters commercially is that the expected range is stated, in writing, before you commit. Most disputes in this industry are variation disputes, and almost all of those are really expectation disputes: the material did what the material does, and nobody had agreed in advance what that would look like across eight hundred square metres.

For large or phased quantities the practical control is the lot. Material reserved from one lot behaves consistently; material topped up later from a different block is where the tone shift a guest notices between two floors comes from.

V1Uniform — consistent ground, minimal movement
V2Moderate — noticeable movement between slabs
V3Substantial — significant differences across a lot
Dimensional measurement being recorded during inspection

Inspection

Release is a gate, not a formality

Inspection covers dimensions and calibration, grade confirmation, variation assignment, defect type and location, repairs and resin work, and finish consistency across the lot.

A lot does not become available, and a production order does not complete, until a qualified person releases it. That decision is recorded against a named individual — not a department.

A lot identifier tag on the edge of a slab bundle

Traceability

The identifier follows the stone

From the moment a block is measured, it carries an identifier. Slabs inherit it, lots aggregate it, and every photograph, measurement, defect note and status change attaches to it.

In the yard this is a scan. In the record it is an audit trail: who changed what, when, and from where. Status changes follow a defined sequence — a lot cannot become available without passing inspection, and it cannot be reserved without a named person taking that decision.

When you approve a lot, we can prove the lot you approved is the lot that shipped.

Technical documentation and a lot record arranged on a work surface

Documentation

Issued per lot, not published as a claim

Test data is issued for the material you are actually buying, on request, at the point in the project where it matters — normally at specification and again at approval.

We deliberately do not publish generic performance figures against a stone name. Natural stone varies between lots; a number measured on someone else’s block is not a specification, and treating it as one is how technical claims end up in dispute. A figure you can rely on is a figure measured on your material.

Water absorptionEN 13755 — decisive for external use, wet areas and freeze exposure.
Flexural strengthEN 12372 — governs spans, fixing method and unsupported cladding.
Abrasion resistanceEN 14157 — the number that matters for entrance and lobby floors.
Slip resistanceTested on the finish actually supplied, wet and dry, for spa and external areas.
Freeze-thawEN 12371 — where the destination climate requires it.
Density / porosityEN 1936 — underpins weight calculations and sealing strategy.

Questions

What quality teams ask before they approve

  1. Can we inspect before shipment?

    Yes, in person or against the lot record — photographs, measurements, grade and defect notes attached to the identifier. Third-party inspection is welcome; the record exists precisely so that an independent party can check it.

  2. What happens if the delivery does not match the approval?

    The identifier makes that answerable rather than arguable. Each lot records who inspected it, on what basis it was released, what was packed and in which crate. A discrepancy becomes a fact to resolve instead of two recollections in conflict.

  3. Do you publish test certificates on the website?

    No, and that is deliberate. A certificate belongs to the lot it was measured on. Publishing one against a stone name invites it to be used as a specification for material it never described.

  4. How is variation agreed so it holds at installation?

    The expected range is stated before commitment and confirmed against the actual lot at release, with photography attached to the identifier. What you approve is what is recorded, and what is recorded is what ships.

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