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Service Bulletin
SB-25-062-A
SILICA WARNING
• DeVilbiss respiratory products are not designed to protect you from the inhalation of
silica while performing, observing, or working in or around sandblasting operations.
• DO NOT enter any potential exposure area until you know the nature of
concentration of the contaminants in the atmosphere and are wearing appropriate
respiratory and other protection for that exposure situation.
The minimum respiratory protection for a worker who is exposed to silica dust, but is
not doing abrasive blasting, is a respirator equipped with a NIOSH approved N95,
R95, or P100 particulate filter. In order to determine which is appropriate for the
given situation, you must assure that the respirator is used in accordance with a
complete respirator program and conduct a hazard assessment which includes
answers to the following questions:
1. What is the maximum potential concentration of airborne crystalline silica likely to
be present?
2. What is the percent crystalline silica content of the construction material?
3. What is the Allowable Exposure Limit (AEL), Permissible Exposure Limit (PEL,
OSHA), Threshold Limit Value (TLV, ACGIH), or other applicable exposure limit for
crystalline silica, based on the answer to question # 2 above?
4. What are the recommendations for respiratory protection on the material safety
data sheets for the construction materials and other materials in use?
5. What is the hazard ratio (maximum potential airborne concentration of crystalline
silica, divided by the applicable exposure limit)?
Based on the Answers To These Questions:
Only use the respirator if concentrations will not exceed 5 times the applicable
exposure limit (according to specific OSHA Standards or applicable government
regulations, whichever is lower).
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