2016-01-01 12:00 - Messages

NIOSH Updates Software for Estimating Respirator Service Life

The NIOSH MultiVapor™ tool has been updated and posted to the web. MultiVapor™ is a computer tool for estimating breakthrough times and service lives of air-purifying respirator cartridges for removing toxic organic vapors from breathed air. It can also be used for larger filters and for carbon beds of any size prepared for laboratory studies. MultiVapor™ 2.2.3 replaces the 2.1.3 version.

Source: http://www.cdc.gov/niosh/npptl/multivapor/multivapor.html

Straight ladder inclined angle in a field environment

The relationship among actual angle, method of setup and knowledgee
Ladder inclined angle is a critical factor that could lead to a slip at the base of portable straight ladders, a major cause of falls from heights. Despite several methods established to help workers achieve the recommended 75.5° angle for ladder setup, it remains unclear if these methods are used in practice. This study explored ladder setup behaviors in a field environment. Professional installers of a company in the cable and other pay TV industry were observed for ladder setup at their worksites. The results showed that the actual angles of 265 ladder setups by 67 participants averaged 67.3° with a standard deviation of 3.22°. Although all the participants had training on recommended ladder setup methods, only three out of 67 participants applied these methods in their daily work and even they failed to achieve the desired 75.5° angle. Therefore, ladder setup remains problematic in real-world situations.

Source: Chang WR, Huang YH, Chang CC, et al. Ergonomics, 2015.

Z96-15 - High-visibility safety apparel

This is the third edition of CSA Z96, High-visibility safety apparel. It supersedes the previous editions published in 2009 and 2002. This edition incorporates advice on selection, use, and care of high-visibility safety material taken from the CSA Z96.1 Guideline (see Annex A). It is designed to be in technical harmony with ANSI/ISEA 107 and ISO 20471.
The focus of this Standard is on the performance of retroreflective and background materials incorporated into garments intended to provide the wearer with increased conspicuity under both wellilluminated and low-light or dark work environmental conditions. It sets out levels of retroreflective performance (i.e., light reflected from vehicle headlights as viewed by the vehicle operator), the colours and luminosity of background materials, and the human body coverage of the high-visibility components. Three classes of garments have been defined based on body coverage of bright or fluorescent-coloured materials, and two levels of performance have been specified for retroreflective materials. In addition, special allowances have been made for garments that are primarily intended to provide flame protection.

Source: http://shop.csa.ca/en/canada/high-visibility-apparel/z96-15/invt/27016522015

New NIOSH Study Supports the OSHA Annual Fit Testing Requirements for Filtering Facepiece Respirators

Results of a recently completed NIOSH study confirm the necessity of the current Occupational Safety and Health Administration (OSHA) respirator fit testing requirement, both annually and when physical changes have occurred. The study's conclusions emphasize that respirator users who have lost more than 20 pounds should be re-tested to be sure that the current size and model of respirator in use still properly fits. For over three years, NIOSH researchers followed a cohort of 229 subjects measuring N95 filtering facepiece respirator (FFR) fit and physical characteristics (e.g., face size, weight) every six months.  Prior to this study, very little research existed looking at the relationship between respirator fit over an extensive period of time and the change in facial dimensions, as could be caused by weight gain or loss. OSHA requires FFR users to undergo an annual fit test, which is vital to ensuring continued proper respirator fit. In addition to annual fit testing, OSHA requires that fit testing be repeated “whenever an employee reports, or the employer or the physician or other licensed health care professional makes visual observations of changes in the employee's physical condition that could affect respirator fit (e.g. facial scarring, dental changes, cosmetic surgery, or an obvious change in body weight.” (OSHA, 1998)

Source: http://blogs.cdc.gov/niosh-science-blog/2016/01/05/fit-testing/

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