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Lot inspection

Partijkeuring natuursteen


The purpose of lot inspections is to determine whether there is sufficient confidence that the characteristics of the products of that lot are in accordance with the established requirements.


Lot inspections are possible for products for which there is no BENOR or COPRO certificate, the producer does not have a certificate for the relevant product, or for which additional requirements have been imposed.

Lot inspections always concern a well-defined quantity of the product to be inspected. The entire lot must be available at the time of inspection.

The inspection is one-off and in principle only the final product is assessed. Thus, a lot inspection cannot provide guarantees concerning raw materials or a production process.

Standard Specifications 250 for road construction, applicable in the Flemish Region, lists the products (Table 3-0-1) for which lot inspections must be carried out. In the Brussels and Walloon Region, the rules for possible lot inspections must be determined in the framework of the tender documents (additional articles related to the standard contract documents, special clauses, …).


The requirements with which the product must comply are laid down in an ‘inspection document’.

This is based on:

  • a standard;
  • a model or standard specification (e.g.: Standard specification 250, CCT Qualiroutes, TB 2015);
  • a special specification;
  • a technical regulation (PTV);
  • a written agreement.


The products presented are marked with a lot number. This is the first stamp. The lot is sampled and tested. If the results meet the requirements of the inspection document, the products are marked with the COPRO logo. This is the second stamp. The certificate is delivered to the party requesting the lot inspection, which in turn submits it to the client.


If a lot meets the requirements, a ‘certificate of conformity’ is issued, indicating that there is a sufficient degree of confidence that the lot in question complies with the inspection document.

This certificate states:

  • the product;
  • the quantity;
  • the applicable identification;
  • the construction site.

If a lot does not meet the requirements, a ‘non-conformity report’ will be issued, indicating that the lot concerned has been inspected but is not in accordance with the inspection document. It clearly indicates which characteristics fall short.

A certificate and a non-conformity report are valid only for a single construction site.


A lot-approved product can be recognised by the certificate of conformity and the identification of the product (marking with lot number and COPRO logo).


A lot inspection gives confidence that the product meets specific requirements, under the supervision of an impartial body.

Subject to approval and under the responsibility of the leading civil servant, lot-approved products may be used. In Flanders, lot-approved products may replace certified products.

Role of COPRO

COPRO performs lot inspections for various construction products on behalf of the user or the producer.

All the provisions of lot inspections are described in the COPRO lot inspection regulations (PKRL), which you can download here.

COPRO also carries out lot inspections on precast concrete products commissioned by PROBETON. For more information we refer you to


Use the digital application form that you can download here.