Dusts, particulate/respirable

Graphite, natural 111 (2.5) (total dust, particulate, respirable)... 

US Occupational Safety and Health Administration Particulates not otherwise regulated, 15mgM, total dust 5mgm , respirable dust. 

Inhalation is actually a less Important route of entry than assumed by CDC, if other data are considered. For example, the EPA has estimated that the average concentration of total suspended particulates (TSP) In Missouri Is about one-half the level assumed by CDC, or about 0.070 mg/m (32.33). Secondly, only a fraction (about 30%) of the total amount of airborne dust Is respirable (less than 10 pm aerodynamic diameter) (32). The percentage of TSP which Is respirable has been estimated by EPA to be no more than 50% (2). Also, the assumption that all of the airborne particles are derived from dioxin-contaminated soil Is overly conservative. Actually, about 50% of the Inhaleable particles are respirable and the remainder are between 10 and 50 pm. Further, about 83% of the non-respirable particles are from crustal material (e.g., soil) and only 47% of the respirable particles are from soil (32). Larger studies conducted by the U.S. EPA have suggested that the portion of Inhaleable dust due to soil can often be much less (34). 

Filtering facepiece (dust mask) means a negative pressure particulate respirator with a filter as an integral part ofthe facepiece orwith the entire face-piece composed ofthe filtering medium. 

Filtering face piece (dust mask)— A negative pressure particulate respirator with a filter as an integral part of the face piece or with the entire face piece composed of the filtering medium. Finance/administration section— The ICS functional area that addresses the financial, administrative, and legal/regulatory issues for the incident management system. 

Staubexplosion dust mask (respirator) Grobstaubmaske > particulate respirator (U.S. safety levels N/R/P according to regulation 42 CFR 84) Staubschutzmaske (partikelfiltemde Masken)... 

Precaution May contain explosive fine dust or such dust may be produced by abrasion during transport wear safety glasses with side shields, chemical resistant gloves, vapor/particulate respirator Hazardous Decomp. Prods. None... 

Precaution Combust. dust can form an explosive mixture with air wear chemical goggles, vapor/particulate respirator, chemical resistant protective gloves, and impenneable protective clothing Hazardous Decomp. Prods. None NFPA Health 1, Flammability 1, Reactivity 0 Storage Store in tightly closed dry container store in a cool place Luwax AF 30 [BASF BASF AG]... 

Precaution Avoid inh. of dust wear chemical goggles, vapor/particulate respirator, chemical resistant protective gloves, and impermeable protetive clothing avoid dust formation... 

Mg(OH)2 powder is classified by OSHA as a nuisance dust. ACGIH categorizes the powder form as particulates not otherwise classified. Exposure limits are as follows (108) ACGIH 10 mg/m , OSHA 5 mg/m (respirable), and 15 mg/m (total). Magnesium hydroxide is reported in the EPA TSCA inventory (109). 

PPS dust should be treated as a nuisance particulate. The OSHA permissible exposure limit for respirable dust is 5 mg/m for dust containing no asbestos and less than 1% siUca. The principal decomposition products released during mol ding of PPS and their permissible exposure limits are given in Table 10. Sulfur dioxide and carbonyl sulfide are the most significant off-gases for production of mucous membrane irritation. 

Air line breathing apparatus Canister respirator Self-contained breathing apparatus Canister respirators with particulate filters Cartridge respirator General purpose dust respirators High efficiency dust respirators... 

Personal protective equipment is clothing and/or respiratory equipment worn to protect the body against various forms of contamination. Some of the most common forms of personal protective equipment include dust masks, air purifying respirators, protective suits made from particulates or chemically resistant materials such as Tyvek (E.I. Du Pont de Nemours Company, Inc., Wilmington, DE) and/or other fabrics, and lightweight protective rubber gloves or chemical-resistant gloves. 

Dust masks, or particulate filter respirators, protect the respiratory system against any kind of inhaled particles. The simplest type, in the form of a cone-shaped fibrous filter that fits over the nose and mouth, is held in place by an elastic band around the back of the head. It is disposable, relatively comfortable to wear, and is useful when the dust is neither excessive nor toxic. It becomes readily clogged and should be discarded and replaced whenever breathing becomes restricted. Its use should not be carried over from day to day. 

Dichlorobenzidine is not a volatile chemical. In the air, it may exist as dust particles or boimd to particulate matter. The absorption of 3,3 -dichlorobenzidine from such respirable particles into the body depends, in part, on the size of the particle. Large particles tend to deposit in the upper airways and are subsequently cleared by ciliary action with little absorption across limg tissues. However, the ciliary action transports the particles to the epiglottis where they are often swallowed, leading to gastrointestinal absorption. Smaller particles can penetrate more deeply into the respiratoiy tree, where 3,3 -dichloro-benzidine absorption may be significant. 

The 2003 ACGIH threshold limit valuetime-weighted average (TLV-TWA) for bituminous or lignite coal dust is 0.9mg/m as respirable particulate a TLV-TWA of... 

The 2003 ACGIH proposed threshold limit value-time-weighted average (TLV-TWA) for amorphous silica, natural diatomaceous earth, is lOmg/m for the inhalable particulate and 3mg/m for respirable dust containing no asbestos and <1% quartz. 

These results have suggested that mineral dusts that are inert in a particulate form may have biological activity when they occur in a fibrous form. Factors affecting fiber toxicity include length, diameter, respirability resistance to chemical dissolution in biological fluids, and durability. "... 

The key issue is the risk of exposure to respirable dusts, especially particulate matter less than 10 xm in diameter (PM10) (see Pless-Mulloli et al. 2000a King et al. 2000 Borm... 

Since its adoption as a cotton dust sampler, the VE has been recognized as a device which sampled other than merely lint-free respirable particles. Bethea and Morey (5) reported that the VE operating under standard conditions (7.4 Lpm) did collect a portion of lint. Several other researchers including Neefus (6), Matlock and Parnell (7.), and Claassen (8) have also reported collections of lint and other particulates greater than 15 vm diameter. 

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