Who Certifies Water-Injected Compressors to ISO 8573-1 Class 0?

Why Independent Certification Matters More Than the Manufacturer’s Own Claim

When a compressor manufacturer states that their machine is “ISO 8573-1 Class 0 certified,” the first question a serious buyer should ask is: certified by whom? The distinction between a self-declaration, a manufacturer test, and a third-party accredited certification is not a bureaucratic detail — it is the difference between a marketing statement and verifiable evidence. In pharmaceutical GMP, food safety auditing, and electronics cleanroom qualification, regulators and quality auditors explicitly require independent verification. A manufacturer’s statement that their own test shows Class 0 is not sufficient. A test report from an independent laboratory accredited under ISO/IEC 17025 — the international standard for testing and calibration laboratory competence — is the minimum credible evidence. Understanding who provides this testing and what “accredited” actually means is essential for any buyer purchasing a water-injected oil-free screw compressor for a compliance-sensitive application.

Who certifies water-injected compressors ISO 8573-1 Class 0

The Certification Chain: Four Levels of Evidence

Level 1 — Marketing Declaration
“Our compressor is oil-free / Class 0.” No test data. Reflects design intent, not measured performance. Not acceptable for any compliance-sensitive application.

Level 2 — Factory Test Report
Manufacturer’s own test team tests the machine in their facility. Provides numerical data but lacks independence. Not accepted for pharmaceutical GMP or BRC audits as primary evidence.

Level 3 — Third-Party Test Report
Independent laboratory conducts the test. If the lab is ISO/IEC 17025 accredited, this is accepted evidence for most regulatory frameworks. Confirms that the test was conducted correctly under a quality management system.

Level 4 — Accredited Scheme Certification
Certification body issues formal product certificate after reviewing test data and conducting periodic follow-up surveillance. Highest form of independent verification — examples include TÜV, Bureau Veritas product certification programmes.

Which Testing Bodies Certify Compressed Air Quality to ISO 8573-1

Several internationally recognised organisations provide ISO 8573-1 testing and certification services for compressed air equipment. Each operates under different geographical strengths and accreditation frameworks, but all credible bodies share the core requirement of ISO/IEC 17025 accreditation for their testing laboratories.

Organisation Type Accreditation Body Scope
TÜV Rheinland / TÜV SÜD Testing & Certification DAkkS (Germany) Global; widely accepted in pharma, food, automotive
Bureau Veritas Testing & Certification COFRAC (France) Global; strong in food, marine, industrial
SGS Testing UKAS (UK) / multiple Global; widely accepted across all sectors
Intertek Testing & Certification UKAS (UK) / multiple Global; strong in consumer goods, electronics
CNAS-accredited labs (China) Testing CNAS (China) / ILAC MRA Accepted internationally via ILAC MRA signatory status
National metrology institutes Reference testing National government PTB (Germany), NPL (UK), NIST (US) — highest reference authority

What ISO/IEC 17025 Accreditation Means for the Test Laboratory

ISO/IEC 17025 is the international standard for the competence of testing and calibration laboratories. A laboratory accredited under this standard has demonstrated — through independent assessment — that its technical staff are qualified, its equipment is calibrated and traceable to national standards, its test methods are validated, and its quality management system ensures consistent, reproducible results. For compressed air purity testing specifically, accreditation to ISO/IEC 17025 for the relevant ISO 8573 test methods (ISO 8573-2 for oil aerosol, ISO 8573-5 for oil vapour) means that the measurement results can be trusted to be accurate and comparable with results from any other accredited laboratory worldwide. The ILAC (International Laboratory Accreditation Cooperation) mutual recognition arrangement ensures that accreditations issued by national bodies — UKAS in the UK, DAkkS in Germany, CNAS in China, NATA in Australia — are mutually recognised internationally, so a test report from a CNAS-accredited Chinese laboratory is accepted in European pharmaceutical audits.

How Hangzhou Ever Power Handles Class 0 Certification

At Hangzhou Ever Power Air Compressor Co., Ltd., the water-injected Class 0 oil-free compressor range has been tested and certified by accredited third-party testing organisations with CNAS accreditation, ensuring that our Class 0 documentation meets the requirements of ILAC MRA signatories worldwide. The test reports provided with each compressor order include the testing laboratory’s name and accreditation number, the specific ISO 8573 test methods applied, numerical results for oil aerosol and oil vapour fractions, the measurement point (complete package outlet), and the operating conditions during the test. Our ISO 9001:2015 manufacturing certificate — issued by an SGS-accredited certification body — confirms that the production processes generating each compressor are formally controlled and that the unit shipped represents standard production quality, not a specially prepared test specimen.

Certified water-injected oil-free screw compressor documentation

Frequently Asked Questions

What accreditation number should I look for on a Class 0 test report?+
The test report should include the testing laboratory’s name, its accreditation body (UKAS, DAkkS, CNAS, etc.), and the specific accreditation number issued to that laboratory. You can verify the accreditation by searching the accreditation body’s public register — UKAS publishes a searchable register at ukas.com; CNAS at cnas.org.cn; DAkkS at dakks.de. The accreditation entry should confirm that the specific test methods used (ISO 8573-2, ISO 8573-5) are within the laboratory’s accredited scope.
Is a CNAS-accredited test report from China accepted in Europe?+
Yes. CNAS (China National Accreditation Service for Conformity Assessment) is a signatory to the ILAC Mutual Recognition Arrangement (MRA). Under the ILAC MRA, accreditations from CNAS member laboratories are recognised by European accreditation bodies including UKAS (UK), DAkkS (Germany), and RvA (Netherlands). A test report from a CNAS-accredited laboratory carrying the ILAC MRA mark is accepted evidence for EU GMP, BRC, and IFS audits.
Does the certification need to be renewed periodically?+
Third-party test reports are issued for a specific compressor model at the time of testing. They do not expire like calibration certificates — the test results remain valid as evidence of the model’s performance under the tested conditions. However, if the manufacturer changes the compression element design, rotor material, or downstream treatment configuration, the test should be repeated on the modified design. For ongoing compliance, the facility’s own periodic point-of-use air quality monitoring provides the operational evidence that Class 0 is being maintained in the installed system.
Can I request a witnessed factory acceptance test instead of a third-party report?+
A witnessed factory acceptance test — where the buyer or their representative witnesses the compressor being tested at the manufacturer’s facility — is a valid and valuable additional verification step, but it does not substitute for the accredited third-party Class 0 test report. The FAT verifies the specific unit’s performance on agreed parameters. The Class 0 test report verifies the oil content measurement methodology under accredited conditions. For pharmaceutical projects, both are typically required.
What is the difference between CE marking and ISO 8573-1 Class 0 certification?+
CE marking covers machinery safety requirements under the EU Machinery Directive — it confirms the machine is safe to operate, not that it produces Class 0 air. ISO 8573-1 Class 0 certification addresses compressed air quality — the purity of the product the machine produces. Both are required for selling and using a compressor in the EU, but they address entirely different aspects of the machine’s compliance. A machine can have CE marking without Class 0 certification, and vice versa if exported outside the EU.

Receive the Full Certification Evidence Pack

Hangzhou Ever Power provides the accredited Class 0 test report, ISO 9001:2015 certificate, and CE declaration of conformity with every order. Contact us to receive sample documentation for your evaluation.

Hangzhou Ever Power Air Compressor Co., Ltd. · Shenhua Road, Hangzhou 310031 · +86 13083988828

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