Taken from BayerCare
Inhalation of MDI vapor and/or aerosol,
at elevated levels (above OELs), has the potential to cause adverse health effects. Possible effects on the respiratory system can include the following: irritation of the nose, throat, and lungs, causing runny nose, sore throat, coughing, tightness in the chest, and shortness of breath. The development of other respiratory conditions, such as hypersensitivity pneumonitis, also are possible, but uncommon.
Respiratory tract sensitization (i.e., the development of asthma) is also possible
as a result of overexposure. Symptoms of sensitization include chest tightness, shortness of breath, coughing, and/or wheezing. These symptoms can be delayed up to several hours after exposure. Sensitization can be permanent,
and extreme asthmatic episodes can be life threatening. Some MDI sensitized individuals can experience asthmatic episodes upon exposure to cold air, dust, or other airborne substances, a condition known as nonspecific bronchial hyperresponsiveness. There is
also evidence, though limited, that repeated overexposures to MDI can lead to reduced lung function.
MDI contact with skin can cause irritation and sensitization effects. The signs of both are similar and include reddening, itching, swelling, and rash. However, in the case of sensitization, these signs can be elicited from only a very
small exposure. Furthermore, animal tests and other research indicate that skin contact with isocyanates can play a role in causing isocyanate sensitization and respiratory reaction.
Eye contact with MDI vapor or liquid
can cause reddening, tearing, stinging, and/or swelling of the eyes. Conjunctivitis also
The chemicals contained within the B-side typically do not have established OELs; however, contact with these components can potentially produce adverse health effects.
The majority of the B-side is comprised of polyols which, in most cases, present minimal hazard from inhalation or skin contact. Further, while some of the other components of the B-side have greater potential to cause adverse health effects, their ability to cause such effects is diminished, because they are typically present at low percentages in the B-side.
Exposure to elevated airborne levels of blowing agent can result in irritation causing coughing, sore throat, and runny nose. Overexposure can also result in cardiac arrhythmia (irregular heartbeat). Skin contact is only slightly irritating. Eye contact with liquid or mist may result in slight irritation. In addition, if sufficient blowing agent is released into a
There are several protective measures that can be taken to effectively reduce exposure.
engineering Controls/Work practices
Spray foam contractors are encouraged
to ventilate the area during and following spraying. For example, windows on opposite sides of a room or structure could be opened to allow outdoor air to enter and inside air to escape. Of course, weather conditions and the circumstances of the job site (e.g., proximity
to bystanders/passersby, other buildings, vehicles, possible regulations, etc.) must be taken into consideration. Active ventilation (i.e., fan/blower exhausting to outside of building) may also be used. Access should be restricted near the exhaust point(s). Do not locate exhaust points near air intakes.
Air monitoring studies have shown that low levels of airborne A- and B-side chemicals can be present in the truck trailer. Accordingly, it is prudent to ensure that all drums of chemicals
given space, air can be displaced, and oxygen deficiency can result.
Exposure to elevated airborne levels of amine catalysts can also result in irritation
of the respiratory tract causing cough, sore throat, and runny nose. Some amine catalysts are also capable of causing respiratory tract sensitization. Skin contact can result in irritation, causing reddening, itching, swelling and/or burns. Some catalysts are also capable of causing skin sensitization. Eye contact can result in reddening, tearing, swelling, burns, and conjunctivitis. In some cases, vapor may temporarily cause vision to become foggy
or blurry, and halos may appear around
Exposure to elevated airborne levels of flame retardants can result in irritation of the respiratory tract causing cough, sore throat, and runny nose. Skin contact can result in slight irritation, while eye contact is generally non-irritating.
Additional information, including first aid procedures for A- and B-side chemicals, can be found in the MSDS.”
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