What Is CNAS? Accreditation, Certificate and Laboratory Verification Guide

CNAS stands for the China National Accreditation Service for Conformity Assessment, China’s national accreditation body responsible for accrediting conformity assessment organizations, including testing and calibration laboratories, inspection bodies, and certification bodies.

For product testing, CNAS accreditation provides formal recognition that a laboratory has demonstrated competence for specified testing activities within its accredited scope. Testing and calibration laboratories are generally assessed against ISO/IEC 17025, together with applicable CNAS accreditation requirements.

A CNAS accreditation certificate confirms an organization’s accreditation status. However, the accreditation scope is equally important because it identifies the specific testing activities, standards, or methods covered by the accreditation.

For companies arranging product testing in China, understanding CNAS accreditation, CNAS certificates, CNAS testing, and accreditation verification helps determine whether a laboratory is suitable for a particular testing program.

What Does CNAS Stand For?

CNAS stands for China National Accreditation Service for Conformity Assessment.

CNAS conducts accreditation activities for organizations involved in conformity assessment. These include:

• Testing and calibration laboratories
• Inspection bodies
• Certification bodies
• Medical laboratories
• Proficiency testing providers
• Reference material producers
• Validation and verification bodies

In product quality and compliance work, companies commonly encounter CNAS when selecting a testing laboratory or inspection body in China.

CNAS accreditation applies to defined activities. An organization holding CNAS accreditation should therefore be evaluated according to both its accreditation status and the scope relevant to the required service.

What Does CNAS Do?

CNAS evaluates conformity assessment bodies against applicable competence and accreditation requirements.

The requirements vary according to the type of organization and activity being assessed.

Testing Laboratory Accreditation

Testing and calibration laboratories are generally assessed against ISO/IEC 17025, which establishes requirements for laboratory competence, impartiality, and consistent operation.

The assessment may consider:

• Personnel competence
• Testing methods
• Laboratory equipment
• Facilities and environmental conditions
• Measurement traceability
• Handling of test items
• Technical records
• Validity of results
• Test reporting
• Management systems

When accreditation is granted, the laboratory receives an approved scope of accreditation describing the activities covered.

Inspection Body Accreditation

CNAS also accredits inspection bodies. These organizations are generally assessed according to ISO/IEC 17020 and applicable accreditation requirements.

Inspection bodies may evaluate products, manufacturing processes, facilities, installations, or other specified subjects against defined requirements.

Certification Body Accreditation

Certification bodies can also receive CNAS accreditation for defined certification activities.

Depending on the certification program, applicable standards may include ISO/IEC 17065 for bodies certifying products, processes, and services, or ISO/IEC 17021-1 for management system certification bodies.

CNAS accredits these organizations for applicable activities. The certification body then conducts certification according to the relevant certification scheme.

What is CNAS Accreditation?

CNAS accreditation is formal recognition that a conformity assessment body has demonstrated competence to perform specified activities.

For a testing laboratory, the accreditation process evaluates technical and management requirements relevant to the laboratory’s work.

Accreditation is granted for a defined scope, which may identify:

• Products or materials
• Test standards
• Test methods
• Parameters
• Measurements
• Calibration capabilities

For example, two laboratories can both hold CNAS accreditation while having very different accredited testing capabilities.

One laboratory may have accredited capabilities for coating and material testing, while another may specialize in electrical or chemical testing.

For this reason, checking that a laboratory is CNAS accredited is only part of the selection process. The accreditation scope should cover the testing activity required for the project.

What is a CNAS Certificate?

A CNAS certificate generally refers to an accreditation certificate issued to an organization that has obtained CNAS accreditation.

The certificate provides information about the accredited organization and its accreditation status. For testing projects, the accompanying accreditation scope provides more detailed information about the recognized capabilities.

When reviewing a CNAS certificate, check:

1. The accredited organization’s name
2. Its accreditation status
3. Certificate information and validity
4. The accreditation scope
5. Whether the required test standard or method is covered

A CNAS accreditation certificate is not a product certificate. A product tested by a CNAS-accredited laboratory does not become a “CNAS-certified product.”

The accreditation applies to the conformity assessment organization and its specified activities.

CNAS Accreditation vs CNAS Certification

Accreditation evaluates the competence of organizations performing conformity assessment activities. These organizations can include laboratories, inspection bodies, and certification bodies.

Certification evaluates conformity with requirements established by a particular certification scheme. Certification can apply to products, processes, services, management systems, or persons.

CNAS performs the accreditation role. An eligible certification body can be accredited by CNAS and subsequently perform certification activities within its applicable scope.

For laboratories, the appropriate terminology is generally CNAS-accredited laboratory.

CNAS vs ISO/IEC 17025

ISO/IEC 17025 is an international standard specifying general requirements for the competence, impartiality, and consistent operation of testing and calibration laboratories.

CNAS is an accreditation body that assesses laboratories against applicable accreditation requirements.

The relationship can be summarized as follows:

	CNAS	ISO/IEC 17025
Type	Accreditation body	International standard
Main purpose	Accreditation of competent conformity assessment bodies	Laboratory competence requirements
Relevant organizations	Laboratories, inspection bodies, certification bodies and others	Testing and calibration laboratories
Main outcome	Accreditation for an approved scope	Requirements used for laboratory assessment

A laboratory can therefore be accredited by CNAS against applicable ISO/IEC 17025-based requirements for specified testing or calibration activities.

Is CNAS Internationally Recognized?

CNAS participates in international mutual recognition arrangements for accreditation.

These arrangements support confidence in accredited conformity assessment results between participating accreditation systems and can facilitate acceptance of testing and other conformity assessment results internationally.

For companies testing products in China for overseas markets, this can be important when selecting a laboratory.

However, the acceptance of a particular test report still depends on factors such as:

• Destination market
• Product regulation
• Test standard
• Laboratory accreditation scope
• Certification scheme
• Regulatory authority requirements
• Buyer or retailer requirements

Before arranging testing for a regulated product, confirm the laboratory qualifications required by the destination market or applicable compliance program.

What is a CNAS-Accredited Laboratory?

A CNAS-accredited laboratory is a laboratory that has been assessed and accredited by CNAS for specified testing or calibration activities.

Accreditation provides recognition of the laboratory’s competence within its approved scope.

A CNAS-accredited laboratory may provide testing involving areas such as:

• Mechanical properties
• Material performance
• Chemical analysis
• Electrical safety
• Coating performance
• Corrosion resistance
• Packaging performance

The actual capabilities depend on the individual laboratory.

A laboratory’s CNAS accreditation should therefore be checked against the specific standard, method, or test parameter required.

What is CNAS Testing?

CNAS testing is a commonly used term for testing performed by a CNAS-accredited laboratory.

CNAS itself does not provide commercial product testing. Testing is performed by accredited laboratories.

A typical process may include:

1. Identifying the product and destination market
2. Determining the applicable test standards
3. Establishing the required testing scope
4. Confirming laboratory capabilities
5. Checking the relevant CNAS accreditation scope
6. Submitting product samples
7. Conducting laboratory testing
8. Issuing the test report

Where accredited testing is specifically required, confirm that the requested testing falls within the laboratory’s current accreditation scope before submitting samples.

How to Verify a CNAS Certificate

CNAS certificate verification should confirm both the organization’s accreditation status and its applicable scope.

The basic process is:

1. Visit the official CNAS website.
2. Search for the laboratory or organization’s name.
3. Confirm its current accreditation status.
4. Review its accreditation information.
5. Open the relevant accreditation scope.
6. Check whether the required standard or test method is included.

The accreditation scope is particularly important for laboratory verification.

For example, a laboratory may advertise numerous testing services while its CNAS accreditation covers only certain methods or product categories.

When testing is required for regulatory, certification, retailer, or customer purposes, verify the relevant scope before commissioning the laboratory.

How to Find a CNAS-Accredited Laboratory

The official CNAS accredited organization database can be used when searching for a CNAS-accredited laboratory in China.

Once a laboratory has been identified, check whether its capabilities match the required testing program.

For example, if you need a specific material test, confirm that the applicable test method appears within the laboratory’s accreditation scope.

The same approach can be used when selecting laboratories for:

• Toys and children’s products
• Textiles and footwear
• Electrical products
• Consumer goods
• Materials and coatings
• Packaging
• Automotive components
• Food-contact materials

A laboratory should be selected according to the required testing scope, not solely because it holds a CNAS accreditation certificate.

CNAS-Accredited Testing in China

ECQA provides in-house laboratory testing in China across several material, coating, mechanical, and packaging testing areas.

Our laboratory capabilities include:

• Salt Spray Testing – Corrosion resistance evaluation using applicable salt spray test methods.
• Coating Testing – Coating adhesion and coating thickness testing.
• Mechanical Testing – Tensile strength testing for metals and applicable materials.
• Packaging Testing – Packaging performance testing according to applicable ISTA methods.
• Hardness Testing – Rockwell and Vickers hardness testing for metals and applicable materials.

Testing is available according to applicable ISO, EN ISO, GB/T, DIN, IEC, ISTA, and other recognized test methods within our laboratory capabilities.

Where CNAS-accredited testing is required, the applicable test method should be confirmed against the laboratory’s current CNAS accreditation scope before testing begins.

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CNAS accreditation provides formal recognition of competence for specified conformity assessment activities in China. When selecting a CNAS-accredited laboratory, verify its current accreditation status and confirm that the required test standard or method falls within its accredited scope.

For product testing in China, provide the product information and required test standard to ECQA so the appropriate laboratory testing scope can be confirmed before samples are submitted.