| 1 | Identify the intended use | Choose a mask according to the exposure risk, setting, and required level of protection. | General-purpose disposable mask, medical procedure mask, or certified respirator | A loose-fitting disposable mask can help reduce droplets, while a well-fitted respirator is designed for stronger filtration of airborne particles. | Very High |
| 2 | Check the outer layer | The exterior should resist light splashes and help prevent larger particles from reaching the inner layers. | Hydrophobic spunbond polypropylene | Spunbond nonwoven fabric is commonly used for the outer layer because it provides structure, softness, and basic fluid resistance. | High |
| 3 | Confirm the filtration layer | Look for a dedicated filter layer rather than relying only on the visible outer fabric. | Meltblown polypropylene with fine fibers and electrostatic charge | Meltblown material is widely used as the central filtration layer because its fine fiber structure can capture small particles while maintaining airflow. | Very High |
| 4 | Review the number of layers | Layer count should be considered together with material quality, construction, and fit. | Common three-layer structure: spunbond / meltblown / spunbond | A three-layer design is common for disposable masks, but more layers do not automatically mean better protection if the filter or seal is poor. | High |
| 5 | Evaluate filtration performance | Use test results or certification information that specifies the particle size, test method, and performance level. | Particle filtration efficiency, bacterial filtration efficiency, or respirator classification | Do not compare percentages from different test methods without checking the testing conditions and applicable standard. | Very High |
| 6 | Assess breathability | The mask should allow comfortable breathing without excessive resistance. | Low-pressure-drop meltblown filter media and breathable spunbond layers | Higher filtration is useful only when the mask remains wearable; excessive breathing resistance may encourage improper use or frequent adjustment. | High |
| 7 | Check the fit and seal | The mask should cover the nose, mouth, and chin with minimal gaps around the edges. | Adjustable nose wire, contoured shape, and secure ear loops or head straps | Fit is especially important for respirators because leakage around the edges can substantially reduce the protection provided by the filter media. | Very High |
| 8 | Inspect fluid resistance | For environments with possible splashes, select a mask tested for the relevant fluid-resistance requirement. | Hydrophobic outer spunbond layer and fluid-resistant construction | Fluid resistance is different from particle filtration; a mask may perform well in one area without providing the same level of performance in the other. | Medium to High |
| 9 | Consider skin comfort and materials | Choose soft, low-lint materials and avoid unnecessary fragrances or irritating finishes. | Soft spunbond polypropylene, smooth inner layer, latex-free components where required | The inner layer should feel comfortable against the skin and should not shed visible fibers during normal use. | Medium |
| 10 | Verify labeling and storage | Packaging should state the applicable standard, size, usage instructions, lot information, and storage conditions. | Traceable packaging, intact seal, dry storage, and expiration information when applicable | Replace a disposable mask when it becomes damp, damaged, visibly soiled, or difficult to breathe through. Follow the product instructions and local requirements. | High |