A toolbox talk on what contact dermatitis is, how to tell if you have it, how it is contracted and how to avoid it. Part of a collection. Click on the 'collection' button to access the other items.
15-MINUTE TOOL BOX SESSION
This tool box session focuses on causes and prevention of skin problems from Portland cement products. At the end of the session, participants should be able to explain how to test the pH of skin and surfaces like glove insides, car seats, and clothing. Participants also should be able to explain that the alkaline pH of wet cement residue can be neutralized with an acidic rinse or a buffering spray.
To present this session, you need a box of full range pH test strips, distilled water, 2 plastic or paper cups, and a small amount of dry Portland cement. To get pH test strips, call your local safety store or Markson LabSales at 1-800-528-5114) or Lab Safety at 1-800-356-0783. For Neutralite, call 1-800-850-3908. For Mason's Hand Rinse, call 510-527-5400.
To learn more about glove
wear and other protections, see
material is supported in part with funds from the National Institute for
Occupational Safety and Health (NIOSH)
through CPWR – Center for Construction Research and Training to a consortium of CPWR,
the Operative Plasterers and Cement Masons International Association,
and FOF Communications. The material does not necessarily reflect the
views or policies of NIOSH. Mention of trade names, commercial products,
or organizations does not imply endorsement by NIOSH, the U.S. Government,
CPWR, OPCMIA, or FOF Communications.
c 1999 FOF
A 15-Minute Tool Box Session
|What is the condition of YOUR skin?|
- Have you had at least one skin problem in the last 12 months?
- Do you have the problem now?
- Do you have:
"If you have any of these symptoms, you could develop a disabling, work-related skin problem."
|What are work-related skin problems?|
Among Portland cement products workers, the most common skin disorders are dry skin, irritant contact dermatitis, allergic contact dermatitis, and cement burns.
Dry skin may include irritation, scaling, itchiness, burning, and redness.
Irritant contact dermatitis (ICD) can be acute or chronic. Symptoms include stinging, pain, itching, blisters, dead skin, scabs, scaling, fissures, redness, swelling, lumps, and watery discharge.
Allergic contact dermatitis (ACD) is an immune response involving the skin. Hexavalent chromium in cement is a primary cause. ACD includes many of the same symptoms as ICD. ACD is difficult to cure and may persist for years.
|Cement burns produce blisters, dead or hardened skin, or black or green skin. If you get a cement burn, go straight to a burn specialist or the emergency room for treatment. By the time you are aware of a cement burn, much damage has already been done. A cement burn can continue to get worse even after you have rinsed off the cement.|
|How common are skin problems?|
|US masonry trades lose work days from skin problems at 2.5 times the national average. Concrete workers lose time at 7 times the average. A statistically reliable survey of apprentice cement masons found 71% had one or more skin problems.|
|What causes skin problems?|
Skin disorders can have one or many causes, among them:
conditions: cold, heat, sun, and humidity can damage skin or increase
the harm of other factors
- worksite materials: Portland cement, admixtures
- conditions of use: How long the product is on your skin and how often you use it can help determine whether it will cause a skin problem.
|What is the nature of cement?|
|What is pH?|
pH is a measure of the alkalinity or acidity of a material. Pure water is pH 7. pH 7 is considered pH-neutral.
The pH scale runs from 1 to 14. Strong acids are less than pH 1 to 3. Vinegar is a weak acid (3.5 pH). Skin is 4.5 pH.
Strong alkalies are 12 to 14 pH. Wet cement -- and lye -- are 12 to 13 pH.
Like the Richter scale for earthquakes, the pH scale is logarithmic. For every whole number increase or decrease, the pH changes 10-fold! The pH of wet cement is one billion times higher than the pH of your skin.
Skin exposed to wet cement becomes more alkaline. At higher pH, skin is more permeable and absorbs more chemicals. Higher alkalinity also may encourage bacterial growth, causing infections that worsen skin problems.
|How do we know what the pH is?|
The MSDS may list pH. Or you can use pH test strips.
To test dry
surfaces, moisten a pH strip in distilled water and
Let's try these pH tests:
|You can also test your hands, your gloves or hard hat, a bar or liquid soap, your car or truck seats.|
|What is an alkali?|
An alkali is a caustic material. Alkalies have a corrosive or irritating effect on living tissue.
Like acids, alkalies burn skin. But alkalies are sneakier than acids. Alkalies damage skin slowly. An alkali such as wet Portland cement can stay on your skin for several hours before you feel the chemical burn.
Acidity and alkalinity are measured on a pH scale.
|How can we control alkalinity?|
Adding an acid to an alkali tends to neutralize its pH. Adding vinegar to cement water can drop the pH from 12 to 8. But it also generates heat.
|Buffers may be a better choice than vinegar. Buffers neutralize both acids and alkalies and generate less heat. Commercial products are marketed for neutralizing the pH of Portland cement products on the skin. Neutralite is a buffering solution. Mason's Hand Rinse is an acidic rinse. In theory, either product or another similar product could be helpful if it neutralizes cement residue on the skin surface.|
|How do we keep skin healthy?|
Wear gloves and practice good hygiene. Keep your skin pH moderately acidic.
|Wash hands 2 to 4 times a day -- before eating, taking a break, when you stop work for the day, and whenever you remove your gloves.|
|Use pH-neutral or slightly acidic soaps: pH 7 or lower. The best soaps for cement products workers may be acidic, pH 5 or 6. That's close to the pH of normal skin (4.5). These soaps tend to neutralize the alkalinity of cement. Use pH neutral soaps at home too. pH-neutral or slightly acidic soaps:|
|For washing, use clean running water. If that is not available, use multiple rinse buckets. Or carry a vinegar-soaked washcloth in a plastic baggy to wipe your hands or use a buffering spray.|
Avoid barrier creams. The abrasiveness of cement can break the cream's seal. Applying barrier creams in the work area can trap contaminants against your skin.