Center National
for Evaluation of Photoprotection

About us

Learn more about our laboratory

Who we are

Find out more about our activities and offers


Involved in societal and economic issues, the CNEP supports Companies and Research Organizations to better understand the phenomena of photochemical, thermal or other aging.
The CNEP also offers you the opportunity to characterize the evolution of plastic materials during accelerated aging.

and analysis

Thanks to its know-how, its analysis and control devices and its experience in polymer chemistry, CNEP can respond to varied requests for characterizations and analyzes.

Durability and aging

Durability of polymeric materials formulated under light or thermal stress.
Photochemical, thermal, hydrolytic aging.
Accelerated and natural aging.

Service life prediction in indoor or outdoor use


Chemical analyzes of formulations Anti-UV and anti-oxidant additive level measurements, pigment levels, fillers, etc.
Determination of thicknesses and compositions of multilayer films, of finished film packaging
Evaluation of bonding, crosslinking of paints


Determination of oxidation degrees at the surface and at the core of the material by measuring the chemical evolution profile
Visual or chemical detection of damage allowing the understanding of the phenomena and support for the resolution of detected problems

Advice and training

On the strength of its Studies and Research, the CNEP, in partnership with the Laboratories, provides Knowledge Sharing days for members of Companies interested in the Durability of Polymer-based Materials.

Standards and specifications

Thanks to its numerous achievements and studies, the CNEP is able to make a decisive contribution in the creation of Standards for formulated Polymer Materials and their uses.

Durability and ageings

Photochemical, thermal, hydrolytic aging..


Chemical analyzes of formulations Measurements of levels of anti-UV or antioxidant additives (Tinuvin 770, Chimassorb 944, etc.), levels of pigments, fillers, etc...


Demonstration of damage visually or chemically allowing understanding of the phenomena


Sapper and scientific expert for insurance companies, courts for any request for chemical damage expertise

Standards and specifications

Standards and specifications Creation of Standards for formulated Polymer Materials and their uses

Advices and trainings

Knowledge Sharing for members of Companies interested in the Durability of Polymer-based Materials

Our concern:

meet the expectations of regional, national or international companies


Listening and taking into account the business problem



An ever faster response for ever longer expected durability



Support and advice in the product development phases



Respect for commitments and confidentialit



Provision of a detailed and reasoned study report



The CNEP is a public limited company that carries out its research under confidentiality contract

The CNEP team, which has 35 years of research in the field of polymer materials, consists of Doctors, Engineers and Technicians.

our team

Do not hesitate to contact us for more information




In charge of researches


In charge of researches

Certifications and accreditations

Our goal: the quality of our research

Always mindful of the quality of our analyzes and the reliability of our scientific data, the CNEP has numerous accreditations or certifications recognized worldwide.

ISO 9001 - v2015

ISO 9001 standard is the standard of quality management. It provides guarantees in terms of organizational quality within any type of structure. The ISO 9001 certification is to prove that a system of continuous improvement has been put in place within our company.

The philosophy of this standard lies in taking into account:
The context of the organization, our products / services
Of our risks and opportunities,
The performance of our system,
Monitoring and improving the satisfaction of our customers and stakeholders

Through this certification, the CNEP anticipates and reduces potential internal malfunctions. It measures the effectiveness of these services in deciding the performance of our organization. This allows us to put in place a logic of continuous improvement. This recognition also allows us to become competitive in international markets.

Centre de Ressources Technologiques (CRT)

The Technological Resource Center (CRT) carries out a mission of general interest as well as the Cell of Technological Diffusion (CDT), directly assisting the companies and more particularly the SMEs, in the definition of their needs, by participating in the development of their activities through innovation and technology, and by building on networks of skills.

This assistance is adapted to each company, it is part of a global approach and takes into account the disciplines that accompany the technological development: transfer, marketing, project management, corporate strategy, regulation, monitoring …

But the essential mission of the CRT is the execution of technological services. It has its own technological and analytical means and offers a range of catalog and customized services, which are the subject of quotations and billing to companies.

There are currently 68 structures labeled CRT.

Certification RENAULT ME D15 3200A

Exposure of flat areas of the parts in the ultra-accelerated conditions of the SEPAP MHE device, in “High Energy” mode (300 W/m2 between 290 and 420 nm, BST= 80 °C) for a duration of 1000 hours,

The samples will be immersed every 50 h for 2 hours in demineralized water at 60 °C

Analyses of the oxidation by FTIR spectrometry in photoacoustic and Diamond ATR mode upon ageing
Modification of the colour studied by UV-Visible spectrophotometry with determination of the CIE L*a*b* colorimetric parameters.
Gloss measurements upon ageing.

The results will be interpreted according to the requirements of the Renault D15 3200-A test method.

Allizé-Plasturgie network member

Allizé-Plasturgie is a professional union serving actors in the plastics and composites sector. In close proximity to companies on a daily basis, Allizé-Plasturgie and its 5 regional organizations act and mobilize their expertise and their networks to feed the strategic and operational thoughts of the member companies.

Led by a management committee made up of business leaders from industrial companies in the plastics industry, Allizé-Plasturgie is constantly adapting to new challenges in the plastics and composites sector.

Our experience

Coming from a fundamental research laboratory, the CNEP has been supporting Businesses (Large Groups, ETIs and SMEs), Research Organizations and Innovation Systems for more than 36 years.
Creation of the photochemistry laboratory
Since 1972, the Laboratory of Molecular and Macromolecular Photochemistry (UMR CNRS 6505) of the Blaise Pascal University (ex UCA) and of the National School of Chemistry of Clermont-Ferrand (ex SIGMA) has been studying the mechanisms of photochemical aging that control the long-term behavior of polymer materials in outdoor use
Creation of the CNEP by Professor Jacques Lemaire

The numerous industrial uses brought about by a better knowledge of the aging mechanisms of polymeric materials made it necessary to set up the CNEP (National Center for the Evaluation of Photoprotection) in 1986 to examine the original problems associated with the long-term quality control of polymer materials in use formulation.

Extension of our buildings
The CNEP continues its development by expanding its building to reach an area of ​​1500m²
"Characterization" team
Arrival of the "characterization" team within the CNEP
CRT approval
The Technological Resource Center (CRT) carries out a mission of general interest just like the Technological Diffusion Unit (CDT), by directly assisting companies and more particularly SMEs, in defining their needs, by participating in the development of their activities through innovation and technology, and relying on networks of skills.
The CNEP sets up its commercial management and customer follow-up software (ERP/CRM), software that is constantly updated
ISO 9001-v2015 Certification
ISO 9001 is the quality management standard. It provides guarantees in terms of organizational quality within any type of structure. ISO 9001 certification consists of providing proof that a continuous improvement system has been implemented within our company.

More details

How we operate


After an exchange between the project manager and a CNEP manager, a study is proposed taking into account the expectations of the project and the samples available for the study. After agreement, a quote and a time limit for completing the study are proposed

Receipt of samples and start of study

The samples received at the CNEP are referenced in our Quality system and then shaped by us in order to meet the expectations of the project and the requirements of our accelerated aging equipment. 
In the specific case of a durability study, the chemical and color changes during exposure in a SEPAP accelerated photo-aging chamber are monitored by IRTF under different adapted modes and by UV-Visible in order to have a global view of the mechanisms involved

Detailed report

At the end of the planned duration of exposure, a report bringing together all the analyzes and changes in the materials as well as a report allowing an estimate of the lifespan of the various materials is sent to the project manager who can ask advice from the researcher who wrote the report

But our activity is not limited to aging, we also offer you our services in polymer analyzes and characterizations, for example

some examples

– Cross sections using a microtome (ambient or cryogenic) and detailed photomicrographs of the sections
– Measurement of the thicknesses of the layers under optical microscopy from sections and analyzes by IRTF ATR-Thunderdome spectrophotometry and by IRTF microspectrophotometry of the different layers
– Thermogravimetric analysis of elastomers:% elastomer and% mineral fillers
– DSC analysis: determination of Tg
– Permeability to oxygen at a temperature of 23 ° C and dry gases
– Permeability to water vapor at a temperature of 38 ° C and 90% RH . . . . .

Do not hesitate to contact us

We will answer as soon as possible

Summer break

The CNEP will be in very reduced activity from August 10 to 15, 2020, contact us preferably after this period.
Thank you

La certification ISO 9001 - 2015

L'ISO 9001:2015 spécifie les exigences relatives au système de management de la qualité lorsqu'un organisme:

a) doit démontrer son aptitude à fournir constamment des produits et des services conformes aux exigences des clients et aux exigences légales et réglementaires applicables, et

b) vise à accroître la satisfaction de ses clients par l'application efficace du système, y compris les processus pour l'amélioration du système et l'assurance de la conformité aux exigences des clients et aux exigences légales et réglementaires applicables.

Toutes les exigences de l'ISO 9001:2015 sont génériques et prévues pour s'appliquer à tout organisme, quels que soient son type ou sa taille, ou les produits et services qu'il fournit.

Obtenir la certification ISO 9001:2015, c’est s’appuyer sur 8 principes de management :
• l’orientation client ;
• l’implication du personnel ;
• l’approche processus ;
• l’amélioration continue ;
• la gestion par approche système ;
• le leadership ;
• la prise de décision fondée sur des preuves ;
• le management des relations avec les parties intéressées.