Tag: physical-mechanical

Related specifically to “mechanical” hazards (sharps, pinch points, etc.)

Protect your face with a face shield

When a hazard involves a lot of energy or aggressive chemicals, your face may be at risk as well as your eyes. Also, Z87.1 or Z87.1+ rated eye protection may not be adequate to protect your eyes, so additional protection might be prudent. If you could injure your face in an accident, use a face shield to protect your face – learn more in High energy facial protection.

Protect your eyes from physical hazards

Physical hazards require eye protection designed for physical hazards. Always wear safety glasses or goggles when working with manual or power tools that may produce small particles (e.g.sanding, milling, cutting, hammering, scraping, etc.); working with tools that can generate droplets or a strong (>20psi) fluidstream, whether the fluid is air, water, or something else; processes producing lots of dust or other particles in the air (e.g., blowing leaves or snow from the sidewalk). Learn more in Physical hazard eye protection.

When do you need safety eyewear? Always!

Even if you are not doing anything that “needs” safety eyewear, you still need safety eyewear in the lab!

You do not have control over all hazards in the lab—one of your fellows may walk in with a chemical bottle and suddenly drop it on the bench in front of you, or a pressurized system (like a gas cylinder regulator) may throw off a part. You are exposed to more hazards than you personally are handling—choose eyewear according to your exposure, not your specific work. There have been incidents at Homewood where uninvolved labmates were suddenly involved in someone else’s accident.

Wearing appropriate eyewear in lab or shop is also a mark of a professional scientist or engineer. If you have to be told to put on your safety glasses or goggles when visiting an industrial or governmental facility, you will be considered unprofessional, and you may not get the job for which you are interviewing. Acquire the habit of wearing safety eyewear.

Algorithm for deciding whether you need safety eyewear:

  1. Is the work you’re about to do hazardous?
    If YES, wear appropriate eyewear. Obviously, you personally need it.
  2. Is anyone else in the lab doing hazardous work?
    If YES, wear appropriate eyewear. You are exposed to their hazards.
  3. Are chemicals or compressed gases stored or used in the lab at any time?
    If YES, wear appropriate eyewear. You do not have control over falling chemical bottles, poorly secured pressurized parts, etc.
  4. Is it possible anyone else will bring hazardous work into the lab while you are there?
    If YES, wear appropriate eyewear. Somebody can walk in and drop a chemical bottle at any time, so you need to be ready.
  5. Is it possible that you will “forget” to put on your eyewear if you decide to do hazardous work—or simply not do it because “you’re just doing one little thing?”
    If YES, wear appropriate eyewear.
  6. Are you sure you won’t do anything hazardous in lab today, no one will walk in with hazardous materials or equipment, nothing hazardous is stored in the lab, and you want to exhibit bad professional habits?
    If YES, you DON’T need to wear safety eyewear.

Sharps do not belong on bench tops!

Something I see all too frequently in labs is sharp objects like syringe needles and razor blades left out on lab benches without shielding. Proper sharps handling is extremely important–besides the usually-painful cuts and punctures that result, any materials on the sharp (pathogens, chemicals, the lead solder you were scraping) now has direct access to your bloodstream. Yuck!

Please note these basic facts about sharps handling:
  1. Anything that can cause a cut, puncture, or other skin penetration is a sharp. This includes needles/syringes, knife blades, Pasteur pipets, broken glass, etc.
  2. Discard disposable sharps such as needles and Pasteur pipets immediately into sharps containers when not in use. Generally, recapping is not recommended for disposables, although if they are required for more than one use a “one-handed scoop” method is allowed to place the shield on the sharp.
  3. Never leave non-disposable sharps such as X-Acto blades unshielded on the bench when not in use. Place them in containers for cleaning or placed in holders not on the bench. It is typical in my experience for students to place the sharps in Petri dishes on the shelf above the bench. In this location they are easily accessible without being potential cut injury sources when someone tries to pick them up off the bench. There is also less chance of the sharp being knocked on the floor or covered by other lab detritus and becoming a hidden hazard.
  4. Dispose sharps only in approved sharps containers such as those sold in Mudd Store. Things should not stick out the top of the container—they should be fully enclosed. Never place sharps directly in a biohazard box or other trash container.
  5. When a sharps container is 3/4 full, replace it immediately—the containers are sharp-resistant, not sharp-proof, and forcing the lid on can sometimes cause a needle or blade to puncture the container. Place the sharps container in a biohazard box for disposal. (If the sharps are radioactive, contact Mina Razavi, the Homewood Radiation Safety Officer, for additional instructions.)
  6. If glass becomes broken, use tongs or a brush and dustpan to collect the shards for disposal in the sharps box—using hands is a frequent source of injury and hazardous materials injection.