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Impulse Assessment of the 3M(trademark) E-A-R(trademark) Skull Screws(trademark) Uncorded Earplug
[Technical Report, Technical Memo]
NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
Pagination or Media Count:
The impulse peak insertion loss IPIL is the standard measure of attenuation provided by hearing protection devices HPDs in response to an impulsive noise. This technical memorandum describes the IPIL testing conducted and the calculated mean IPIL values for the 3Mtrademark E-A-Rtrademark Skull Screwstrademark Uncorded Earplug Skull Screwstrademark Uncorded Model P1300. Testing was completed in accordance with the ANSI standard S12.42-2010. All device samples were tested at the nominal levels of 150, 160, and 170 decibel peak dBP, re 20 muPa. A total of five samples were fitted to an acoustic test fixture two times each for a total of 10 trials per test level. No samples of the HPD were rejected. The mean and standard deviation SD IPIL values were 45.8 1.8 dB SPL at 150 dBP, 47.4 1.7 dB SPL at 160 dBP, and 48.2 1.6 dB SPL at 170 dBP. These results suggest that, when properly fit and functional, the Skull Screws Uncorded will adequately protect i.e., reduce exposure to less than 140 dBP against impulses below 180.0 dBP.
[A, Approved For Public Release]