Hello:I have an associated question to Bradley's that shows my lack of knowl edge: what is/are the respiratory regulatory issues surrounding the operati on of a grinder/mill, specifically one that can generate over 1 kilogram of material?Thanks in advance, JimOn Tue, Jan 25, 2011 at 8:53 AM, Norwood, Brad < span dir="ltr"><Brad.Norwood**At_Symbol_Here**aristalabs.com> wrote:
All,As an analytical laboratory, we operate under the Laboratory Standard 1910.1450 of the OSHA regulations. We have excellent engineering cont rols, and have done monitoring for the the atmosphere contaminants that wou ld be of concern. We don=E2=80=99t meet the OSHA threshold for any of those.That being said, we sometimes have to grind samples in knife mills, an d this can generate some dust (though still well below the threshold).  ; Per 1910.134 Appendix D (
http://www.osha.gov/pls/oshaweb/owadisp.show_docume nt?p_table=STANDARDS&p_id=9784) we conduct and docum ent training to ensure that our employees have a firm basis upon which to c hoose a dust mask appropriate to their task and comfort.Now, my toxicology group wants to order surgical masks, and since 1910 .134 defines a "respirator=" as:Filtering facepiece (dust mask) means a negative pressur e particulate respirator with a filter as an integral part of the facepiece or with the entire facepiece composed of the filtering medium (emph asis added).In light of the above definition, I am forced to ask: is a surgi cal mask considered a =E2=80=98respirator=E2=80=99? Do I now need to document a) that there is no condition which requires use of a respi rator/surgical mask/form of protection in the toxicology section and b) tha t if not, all of the toxicologists are also trained in accordance with Appe ndix D to 1910.134?<sigh>Dr. Bradley K. NorwoodLaboratory DirectorArista Laboratories1941 Reymet RoadRichmond, VA 23237(804) 271-5572 ext. 307(804) 641-4641 (cell)************** D i s c l a i m e r * **************
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