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New Methods for End of Service Life Indicators and Change-Out Schedules


  • Develop and apply a theoretical and semi-empirical physical model for describing, correlating, and predicting breakthrough times of gases (inorganic and organic), which are removed from air by reactions with or catalysis by chemical impregnates on activated carbon in packed beds.
MultiVapor software cover art

Applicable Standards

  • OSHA standard 1910.134(d)(3)(iii)(B)(2) 42 CFR Part 84 Subpart G, Section 84.1157. Vol 60, Number 110

Key Partners

  • National Paint & Coatings Association
  • Organization Resources Counselors, Inc.
  • American Petroleum Institute
  • Los Alamos National Laboratory


  • Emergency worker and general industry workers who utilize air purifying respirators

Project Scope

  • Develop math models for predicting breakthrough time
  • Develop software to implement the models
  • Distribute models to public via NIOSH/OSHA websites
  • Develop training videos for users


  • Q1 Complete generation of first phase of cartridge data
  • Q1 Move MultiVapor from beta to final version
  • Q2 Determine cost and challenges to convert Multivapor to Spanish version
  • Q3 develop MultiVapor to include cartridge reuse
  • Q4 Submit software for OD approval


  • Manuscripts published or submitted to peer review journals (approx. 3)
  • Presentations to stakeholders or conferences (approx. 10)
  • Standards committee meetings & public meetings (approx. 15)
  • Post Multivapor for public use
  • Develop cartridge test procedures for acid-base gas model
  • Complete and post Web based Multivapor software


  • Three models that will cover most chemical agents to calculate ESL for air purifying respirators
  • 7000 downloads from web
  • Over 1000 CDs requested
  • Used in university training classes
Page last updated: August 08, 2008
Page last reviewed: August 08, 2008
Content Source: National Institute for Occupational Safety and Health (NIOSH)