CHAPTER 6: Control Measures: When and How to Use Fume Hoods and Other Protective Equipment?

“The Chemical Hygiene Plan shall include each of the following elements and shall indicate specific measures that the employer will take to ensure laboratory employee protection:
(ii) Criteria the employer will use to implement control measures to reduce employee exposure to hazardous chemicals including, engineering controls, the use of personal protective equipment and hygiene practices; particular attention shall be given to the selection of control measures for chemicals that are known to be extremely hazardous.”
                                                                                                                      29 CFR 1910.1450(e)(3)(ii)

6.0 Introduction
The primary goal of this Safety Manual is to provide policies and guidelines that, when properly followed, protect persons from harmful exposure to hazardous chemicals.  This chapter contains criteria and guidelines that will be used to determine if engineering controls and/or personal protective equipment are required to minimize or eliminate exposure to hazardous substances.

6.1 Quick Guide - When to Wear Goggles and Other Basic PPE
               (See Section 4.2 for detailed guidelines)

6.1.a    Goggles & Proper Personal Clothing
Chemical splash resistant safety goggles (ANSI Z87.1-2010; Type H – indirect venting) and proper personal clothing must be worn at all times when you are:

  1. Working with hazardous chemicals,
  2. In a room where others are using hazardous chemicals, or
  3. In a room where hazardous chemicals are available for use (i.e., chemicals are on shelves or countertops and are not stored in closed cabinets), because such chemicals could be accidentally knocked over resulting in a release of the substance.
  4. Type H goggles are also rated as impact resistant, and must be worn when conducting procedures that involve vessels that are under either sufficient positive/negative pressure such that an accidental breaking of the vessel would result in flying debris.

6.1.b   Proper Personal Clothing
Basic PPE includes the daily clothing that you wear.  To ensure that you are wearing the proper personal clothing, follow these guidelines:

  1. Wear long pants.
  2. Wear shoes with fully closed tops and heels.  Sandals, open-toed, or open-heeled footwear are not allowed.
  3. Wear shirts that do not expose considerable amounts of skin; the midsection of the body must be covered.
  4. Lab coats are strongly recommended.
  5. Do not wear clothing with excessively loose sleeves and other material.
  6. Loose, long hair needs to be tied back.
  7. Loose jewelry must be removed (it is best to not wear any jewelry in the lab).

6.1.c    Gloves

  1. The appropriate gloves are necessary while handling any hazardous substance, including excessively hot or cold substances.  See Section 4.2.d.5 for further details.

6.1.d    Benchtop Safety Shields. Note that the use of a closed fume hood sash may suffice, but realize that there may be situations when a safety shield must be used inside a fume hood.  The shield must be placed between the apparatus and the worker.  These shields (in addition to chemical splash-resistant goggles) must be used when:

  1. A higher-than-normal splash hazard exists (e.g., heating concentrated corrosives).
  2. The contents are under a positive or negative pressure that is sufficiently strong enough to potentially cause the container to break (refer to manufacturer’s specifications).