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Table Of Contents  CertiGuide to A+ (A+ 4 Real)
 9  Chapter 12: Material Safety: a Personal and Technical Report on Hazardous Material Handling
      9  Reading and Understanding MSDSs
           9  Section Eight - Exposure Controls Data

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Concentration Limits and Personal Protective Equipment

So, we can see by the information under the respirator protection heading that the use of a respirator is required if this product is used in a confined space, however, anywhere else, only "when needed". The "when needed" indicates when the concentration levels cannot be maintained at safe levels. Additionally, this section specifies the use of organic vapor cartridges when using air-purifying respirators. It also requires the use of a supplied-air respirator when there is the likelihood that atmosphere may be oxygen deficient or above the IDLH.

The National Institute for Occupational Safety and Health (NIOSH)161 has established a concentration level limit for hundreds of chemicals that is known as the IDLH, an acronym for "Immediate Danger of Life and Health". The IDLH is defined as the maximum exposure concentration of a given chemical from which one could escape within 30 minutes without any escape-impairing symptoms or any irreversible health effects. Primarily used in proper respirator type selection, the IDLH level is considerably lower then the LD50 or LC50 and takes into account other factors, besides toxicity, such as explosiveness and impairment of the senses, motor coordination and mental faculties. These values, when listed in a MSDS, are normally found in the section that details respirator use. Other sources for IDLHs are the NIOSH web site162 or the NIOSH Packet Guide to Chemical Hazards163 that NIOSH will sent to you free of charge.

OSHA strictly regulates the use of respirators164. Only employees that have been medically evaluated, fit-tested and properly trained can use a respirator in the workplace. Oh, by the way, OHSA also has strict regulations on confined spaces165, so unless your employer has adequately trained you on "confined space entry", do not go in one.

Because this product may cause irritation of the eyes and skin, the use of eye protection, chemically resistant gloves and other protection to prevent skin contact is indicted. Although some MSDSs will state glove type recommendations, this MSDS does not specify any glove types, requiring the user to make the proper PPE selection.

The proper selection of chemically resistant Personal Protection Equipment (PPE)166, such as gloves, needs to be carefully evaluated, taking into consideration the protective factors of PPE's material to the chemical exposure(s). In example, while Nitrile and Viton over Butyl gloves both have excellent protective ratings for hexane, Nitrile gloves are not recommended for protection against Methyl Ethyl Ketone. Thus, Nitrile gloves would not provide appropriate protection when using Tcat's Unreal Kleen. These ratings are based of the chemical's ability to degrade the material (degradation rating), the time it takes the chemical to penetrate through the material (permeation breakthrough) and the flow rates of the chemical passing through the material (permeation rate). Most manufacturers of PPE have selection guides that provide the necessary selection information.167

At beginning of this section is the general hygiene information that should be followed. I am always amazed that people will go through the trouble of dunning personal protection equipment (PPE) and then diminish or even negate the protection gained by careless behavior. What I am speaking of are actions such as reaching into your pockets, wiping your face, answering your cell phone while wearing contaminated gloves. Think about it, you hold the cell phone with contaminated gloves on and transfer the substance to it, then through out the rest of the day, you place that phone against your skin and in close proximately to your nose and mouth.


161. http://www.cdc.gov/niosh/homepage.html

162. http://www.cdc.gov/niosh/idlh/intridl4.html

163. http://www.cdc.gov/niosh/npg/npg.html

164. http://snipurl.com/OSHA1910_134

165. http://snipurl.com/OSHA1910_146

166. http://www.osha.gov/SLTC/personalprotectiveequipment/

167. http://snipurl.com/ChemicalGuide or http://www.chemrest.com/select_chemical_by_name.htm

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Section Eight - Exposure Controls Data
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Section Nine - First Aid Data
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