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N Mark for plastic water piping systems
N Mark of quality for plastic pipe systems for hot or cold water and heating (PEX, PP, PB, PERT, PVC-C, Multilayer

N Mark for plastic water piping systems

N Mark for plastic water piping systems

The N Mark for plastic piping systems for hot, cold and central heating water (PEX, PP, RP, PERT, CPVC, Multi-layer) certifies that these products comply with national and European standards

AENOR product certification is an essential tool for increasing product quality. It provides the consumer with greater confidence in the product, improves sales and facilitates insertion into new markets

The N Mark covers the following products:

  • Cross-linked Polyethylene (PEX) Tubes, Accessories and Systems for hot and cold water installations in accordance with standards UNE-EN-ISO 15875 or SANS 15875
  • Polypropylene (PP) Tubes, Accessories and Systems for hot and cold water installations in accordance with standards UNE-EN-ISO 15874 or SANS 15874
  • Polybutylene (PB) Tubes, Accessories and Systems for hot and cold water installations in accordance with standards UNE-EN-ISO 15876 or SANS 15876
  • Chlorinated PVC (CPVC) Tubes, Accessories and Systems for hot and cold water installations in accordance with standards UNE-EN-ISO 15877 or SANS 15877
  • Multi-layer piping systems for hot and cold water installations in the interior of buildings in accordance with standards UNE-EN-ISO 21003 or SANS 21003

As a compliance assessor, AENOR is a leading product certification entity. AENOR's N Mark is one of the world's top five product quality marks. In total, more than products have been certified with an N Mark in more than 40 countries.

AENOR's N Mark is voluntary and enables companies to demonstrate that their products comply with the service provision requirements of UNE, EN and ISO standards or technical specifications. This demonstration of compliance during the manufacturing and testing of the final products, based on a rigorous control performed by AENOR, will allow licensees of the Mark to put their products on the market with a high standard of quality, instilling confidence in the users of these certified products.

This way, the AENOR N Mark provides the following advantages:

The manufacturer

  • Affords greater knowledge of the product via the exhaustive control set forth by the N​ Mark
  • Products that do not comply with relevant standards or regulations can be detected before they enter the market
  • Lowers the production costs since there is greater control during the manufacturing process.
  • There are commercial grounds to introduce the product into new markets and facilitate access to works

Business providers and monitoring agents

  • Guarantees that the product has undergone prior verification to determine its compliance with minimum requirements
  • Products with long-lasting confidence. Product assessments are ongoing, guaranteeing compliance with the initial certified provisions
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Public Administrations

  • ​​Guarantees that the prescribed product will comply with the applicable statutory requirements
  • Transparency of the AENOR certification process.
  • Strikes a balance among interested parties with regard to decisions on the certified products

The end user

  • Confidence from knowing that the product has undergone prior verification
  • Credibility, the product is assessed by a recognised certification company​
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The AENOR Mark is voluntary. Companies that want AENOR to certify their product must submit their application in accordance with the formats established by AENOR. This application must include information about the company and the characteristics of the products for which certification is sought.

Once the documentation is analysed by AENOR technicians, the conformity assessment is initiated to verify that the products comply with the applicable standards:


A visit is made to the production centre to carry out the following procedures:

  • a) the quality management system is audited in accordance with the UNE-EN ISO 9001 requirements that are directly related to the production process.
  • b) The manufacturer's manufacturing process and production controls are inspected to ensure the product complies with the requirements of the standard.
  • c) Samples are taken and sent to an accredited laboratory, which performs the tests included in the standards. The manufacturer sends samples identified by the auditor to the laboratory.


The laboratory performs the tests established by the standard and sends its report to AENOR.


Using all the information on the activities performed, the Plastics Certification Technical Committee (an independent body established by all the interested parties: manufacturers, the Administration, users, monitoring entities and AENOR) will either propose to AENOR that the Mark be granted, or request that one of the activities be repeated due to non-compliance.

Once the Certificate has been granted, the process will continue as the monitoring activities required to keep it must be performed. Samples will be taken, and audits, inspections and tests will be performed on an annual basis. The result is assessed on a yearly basis by the Certification Committee Technical for Plastics, who decides whether the Mark is retained

Once the organisation passes the certification process, it obtains: ​

  • The AENOR product certificate
  • A licence to use AENOR's Mark of certified products
AENOR N Mark logo for a certified product  

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