Respiratory Protection

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Harmful substances may be in the form of dusts, mists, fumes, gases or vapours, or combinations of these substances. There are many important factors to be considered before choosing which respirator is most suitable for an application.

Ensure there is sufficient oxygen present. Please refer to standards or regulations for concentration level details. An air-purifying respirator does not supply air; it only filters the existing air.
Determine the physical and chemical properties of the contaminant, which can be ascertained from the most current Material Safety Data Sheet (MSDS) for the substance concerned, or from other appropriate reference material.
Determine the concentration of the contaminant in your workplace environment. Lower capacity respirators are only designed to work in concentrations up to a certain level and you may need to use a different respirator depending on the concentration present.
Assess the working conditions and respirator protection factor. P1 respirators are for protection against mechanically-generated particulates. P2 respirators are for protection against mechanically and thermally-generated particulates. Class P3 respirators are intended for use against all particulates including highly toxic materials. Other filter types or types of respirators are to be considered for protection against gases and vapours. The type of contaminant and concentration will determine which filter/respirator is required. You need to know the workplace exposure standard for the contaminant, eg 'Worksafe Australia Exposure Standards for atmospheric contaminants in the occupational environment'.
Select the right respirator/filter for the task, and ensure a proper fit. Where concentrations permit, disposable respirators are a good solution because of their greater comfort. If you use replaceable filter respirators, you must implement a respirator maintenance program in accordance with AS/NZS 1715.
Conduct training in the need for and correct use of respirators.

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