Complete specification verification guide for KN95 respirators: technical requirements (filtration, resistance, TIL), certification documents, physical product checks, and fit testing.
Certification Standards · KN95 Respirator Compliance
What KN95 Respirator Specifications and Standards Must Buyers Verify?
KN95 respirator procurement requires verifying a specific set of technical specifications and certifications. Missing any of these can result in non-compliant product, customs rejection, or end-user safety risks. This guide provides a complete specification checklist for B2B buyers.
Verification rule: Every specification claim must be backed by a test report. If the supplier claims ≥95% filtration, they must have a GB2626-2006 test report proving it. No document = no claim.
Core Technical Specifications to Verify
| Specification | Requirement (GB2626-2006) | How to Verify |
|---|---|---|
| Filtration efficiency | ≥95% at 0.3µm (NaCl aerosol) | GB2626-2006 test report |
| Inhalation resistance | ≤350 Pa | Test report breathing resistance section |
| Exhalation resistance | ≤250 Pa | Test report breathing resistance section |
| Total inward leakage | ≤8% | Test report TIL section (human subject test) |
| Valve leakage (if valved) | No leakage on exhalation | Valved respirator test report |
| Dead space CO₂ | ≤1% | Test report dead space section |
| Field of vision | Adequate per standard | Test report visual section |
Certification Documents Required
For a complete compliance package, request:
- GB2626-2006 test report: From an accredited Chinese testing laboratory. Must include lab name, accreditation number, report number, and date.
- CE certificate: With Notified Body number verifiable in NANDO. See CE certification requirements.
- FDA documentation: If importing to the US, verify current FDA requirements. See FDA approval requirements for KN95.
- Declaration of Conformity: Manufacturer's signed declaration.ion.
- Batch QC report: Specific to the production lot being purchased.
Physical Product Verification
Beyond documents, verify the physical product matches specifications:
- Layer count: KN95 respirators typically have 4-5 layers. Cut a sample and verify.
- Meltblown presence: The middle filtration layer must be meltblown polypropylene. See meltblown quality control.
- Nose clip: Must be adjustable and maintain shape after bending.
- Strap tension: Ear loops or head straps must provide adequate seal pressure.
- Marking: Must show standard (GB2626-2006 KN95), manufacturer name, and model number.
The KN95 cup respirator from Justsun meets all these specifications, with GB2626-2006 and CE certification documentation available upon request.
Fit Testing Requirements
Even with perfect specifications, a respirator only works if it fits. Fit testing verifies the seal between the respirator and the wearer's face:ace:
- Qualitative fit test: Uses taste/odor agents (bitrex, saccharin) to detect leakage
- Quantitative fit test: Uses instruments to measure particle concentration inside vs outside the mask
- Fit factor: Minimum fit factor of 100 for KN95/FFP2-level respirators
For complete fit testing protocols, see KN95 respirator fit testing guidelines.
FAQ
How many layers should a KN95 respirator have?
Typically 4-5 layers: outer nonwoven, meltblown filter, electrostatic layer (optional), second meltblown, and inner comfort layer. The critical layer is the meltblown polypropylene, which provides the filtration. See how KN95 mask layers filter particles.
What does TIL ≤8% mean in practice?
Total inward leakage (TIL) measures all air that enters the mask through any path - filter, seal gaps, valve. ≤8% means at most 8% of inhaled air bypasses the filter. This is tested with human subjects performing movements. A well-fitted KN95 should achieve well below this threshold.
Conclusion
KN95 respirator specification verification is a multi-step process: document review (test reports, CE, FDA), physical product inspection (layers, meltblown, marking), and fit testing. Every claim must be backed by documentation. Working with a manufacturer like Justsun that provides complete compliance packages streamlines this process and reduces procurement risk.