top of page
4.3.7 Custom Mould Variability
Fit Testing Evidence
- HSE RR727 found that many custom-moulded earplugs did not achieve their claimed attenuation.
- Performance varied due to impression quality, manufacturing process, and material.
- Passing a pressure seal test does not guarantee adequate acoustic attenuation.
- Fit testing is required to verify that each individual achieves sufficient protection from a custom mould.
What it is: The HSEs 2009 market surveillance report (RR727) found that a significant number of custom-moulded earplugs failed to provide their claimed level of attenuation. The quality of the impression, manufacturing process, and material can all impact performance. - Why it matters: Employers cannot assume that expensive custom-moulded plugs are automatically effective. Fit testing is essential to verify the performance of these devices for each individual, ensuring the investment provides the expected protection. Related: [#hse-rr727](#hse-rr727).
bottom of page