Impulse Assessment of the Moldex (R) Pura-Fit (R) Earplug

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 corded Moldex Pura-Fit (Pura-Fit Corded; Model: 6900). 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 60.8 (2.4) dB SPL at 160 dBP and 61.7 (2.0) dB SPL at 170 dBP (see Table 1). These results suggest that when properly fit and functional, the Pura-Fit Corded will adequately protect (i.e., reduce exposure to less than 140 dBP) for impulses below 180.0 dBP.

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Document Details

Document Type
Technical Report
Publication Date
Dec 14, 2021
Accession Number
AD1155064

Entities

People

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

Organizations

  • Naval Submarine Medical Research Laboratory

Tags

Communities of Interest

  • Biomedical
  • Ground and Sea Platforms
  • Human Systems

DTIC Thesaurus Topics

  • Acquisition
  • Air Compressors
  • Air Pressure
  • Attenuation
  • Biomedical Research
  • Data Acquisition
  • Data Analysis
  • Department Of Defense
  • Ear
  • Filters
  • Free Field
  • Frequency
  • Governments
  • Hearing Protection
  • Impulse Noise
  • Insertion Loss
  • Microphones
  • Shock Tubes
  • Small Arms
  • Standards
  • Test Fixtures
  • Transfer Functions
  • United States
  • United States Government

Readers

  • Acoustics.