Document 1yKr7MGop7ga2Ereomp6jp0xj

t Page 2 April 23, 1979 Respirator Coordinators DISPOSABLE RESPIRATORS Starch Titanium Dioxide Aluminum Oxide The 3H No. 8710 is not approved for toxic materials, carcinogens or irritants. For most dry particulates which do not fall in the approval for the No. 87IO, the 3^ No. 9900 can be used. The No. 9900 has ap proval for toxic dusts which have exposure limits of not less than 0.05 mg/m3. In general, dusts which have not effect of causing pneumoconiosis 3M No. 9900. Of course, the No. cations of the No. 8710 as well. been judged to have the sole are the prime challenges of the _ 9900 can be used for all appli If protection from mists is required, the 3N No. 9910 is the approved disposable respirator. Neither the No. o7i0, No. 3900 nor No. 3310 is approved for yoie, vapors or fumes. This means, mists with significant vapor pres sures (other than water) are not applicable. Examples of approved mists other than aqueous solutions are glycerine and polyglycols. I am continuing to review the usage of disposable respirators as well as the developing data on their applicability and will keep you up to date on these. DTI:amb DUP 0904983 12133J