Accession Number:

AD1155306

Title:

Impulse Assessment of the Uncorded Moldex (registered) Pura Fit (registered) Earplug

Descriptive Note:

[Technical Report, Technical Memo]

Corporate Author:

NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CTLEIDOS HOLDINGS INC RESTON VA

Personal Author(s):

• Silvia, Natalie
• Kolias, Alexa H.
• Schwaller, Derek W.
• Karch, Stephanie J.
• Federman, Jeremy S.

Report Date:

2021-12-16

Pagination or Media Count:

42

Abstract:

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 uncorded Moldex Pura-Fit Pura-Fit Uncorded Model 6800. Testing was in accordance with the American National Standards Institute ANSI standard S12.42-2010. All samples were tested at the nominal levels of 160 and 170 decibel peak dBP, re 20 Pa. 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 54.4 2.7 dB SPL at 160 dBP and 54.6 2.2 dB SPL at 170 dBP see Table 1. These results suggest that when properly fit and functional, the Pura-Fit Uncorded will adequately protect i.e., reduce exposure to less than 140 dBP for impulses below 180.0 dBP.

Descriptors:

• biomedical research
• united states
• department of defense
• data acquisition
• ear
• governments
• test fixtures
• acquisition
• attenuation
• free field
• hearing protection
• impulse noise
• insertion loss
• shock tubes
• transfer functions
• united states government
• data analysis

Subject Categories:

• Protective Equipment
• Test Facilities, Equipment and Methods
• Acoustics

Distribution Statement:

[A, Approved For Public Release]