Learning Center
Plans & pricing Sign in
Sign Out

Methylenedianiline MDA


									                                                             MIOSHA Fact Sheet
                                      General Industry Safety & Health Division


What is Methylenedianiline (MDA)?                       or its salts are possible. This standard includes the
                                                        following requirements:
MDA is a man-made chemical that is mainly used           Perform initial air monitoring to determine
to produce other chemicals. Michigan does not               employee exposure. The “action level” is 5
have a producer of MDA, but it is commonly used             parts per billion parts of air (ppb) of MDA and
as a curing agent and hardener in epoxy resins,             the “permissible exposure limit” (PEL) is 10
urethanes and rubber. In general, cured materials           ppb. These exposure limits are based on an
do not present an occupational hazard.                      employee’s average exposure for an eight-hour
                                                            work day. Relative to other exposure limits
MDA is also known by other names, but the CAS               these limits are very low.
number of 101-77-9 is a unique identifier for MDA.       Perform periodic air monitoring, at least every
When applicable, this number is required on                 6 months, when initial monitoring shows
material safety data sheets (MSDS).                         employee exposure at or above the action level,
                                                            but below the PEL.
How can exposure to MDA affect me?                       Monitoring for dermal effects must be
                                                            routinely performed and employee reports of
Exposure can cause liver damage; and skin and eye           potential dermal exposures shall be referred to
irritation. Liver damage has symptoms that include          medical personnel for observation. Skin contact
jaundice, liver tenderness, weakness, nausea,               with      materials    containing     MDA       at
headache, fever, and muscle pain.        MDA is             concentrations >0.1% by weight or volume are
considered a suspected human carcinogen.                    considered to be dermal exposure.
                                                         Establish a regulated area when the PEL is
How does exposure to MDA occur?                             exceeded or dermal exposure is expected. Limit
                                                            access to authorized personnel (people who
Exposure to MDA can occur when the substance is             have to work or be present in the area). No
inhaled, ingested or absorbed through the skin. At          food, cosmetics, gum, smoking or drinking is
room temperature, MDA evaporates very slowly                allowed in a regulated area.
and does not present a vapor hazard. Common              Use appropriate engineering or work
routes of occupational exposures are inhaling dusts         practice controls to reduce employee exposure
or mists and skin contact. Unlike many chemicals,           below the PEL. This can include local exhaust
MDA is readily absorbed through the skin.                   ventilation, limiting an operation to a particular
Ingestion can also be a significant route of exposure       area (enclosed room or booth), or having
if proper hygiene practices are not followed.               prescribed methods of performing the job.
                                                            Employee job rotation cannot be used to comply
Is employee exposure to MDA or its salts                    with the PEL.
                                                         Provide respiratory protection in accordance
                                                            with Part 451, Respiratory Protection Standard
                                                            and according to Table 1 of the
Yes, Part 303. Methylenedianiline (MDA) is the
                                                            Methylenedianiline Standard, whenever the PEL
MIOSHA standard that protects employees and
                                                            is exceeded and feasible controls cannot reduce
specifies the requirements when exposure to MDA
                                                            exposures below the PEL.
   Provide personal protective clothing or                                           o All training program materials and the
    equipment whenever:                                                                   standard must be readily available to all
    o The PEL is exceeded;                                                                affected employees.
    o There is dermal exposure;                                                      Medical surveillance by a licensed
    o Or when liquids that contain MDA can be                                         physician and without employee cost is
        splashed or sprayed into an employees eyes.                                   required when:
   Ensure contaminated clothing and equipment                                        o The action level is exceeded for 30 or
    is removed at the workplace, properly stored,                                         more days per year;
    cleaned and replaced. Employees cannot take                                       o Employees have dermal exposure for 15
    such contaminated items from the workplace.                                           or more days per year;
    Inform any person who launders or cleans such                                     o Exposure occurs in an emergency
    clothing or equipment that MDA is present.                                            situation;
   Implement good personal hygiene practices                                         o Dermal exposure monitoring indicates
    and provide for change rooms and washing                                              dermal exposure; or
    facilities. Eating and drinking areas must be                                     o Employees show signs or symptoms of
    provided according to the standard.                                                   exposure.
   Part 303 requires that lunch areas located                                       Records must be kept of all air monitoring;
    within areas in which there is potential for                                      any objective data relied upon to meet the
    airborne exposure to MDA at or above the PEL                                      standard’s requirements such as materials,
    shall have a positive-pressure, temperature-                                      operations, processes, etc.; employee
    controlled, filtered air supply.                                                  medical surveillance or removal, employee
   In addition to all requirements of Part 430.                                      medical complaints related to MDA
    Hazard Communication, employees must be                                           exposure, etc.
    provided with the following information and
    training:                                                               Additional Information
    o The contents of the MDA standard and
        appendices;                                                         Please visit the MIOSHA website at
    o Explain the medical surveillance and                         where
        removal program;                                                    additional information may be available; or contact
                                                                            the Consultation, Education & Training Division at
                                                                            (517) 322-1809.

                                                 LARA is an equal opportunity employer/program.
            Auxiliary aids, services and other reasonable accommodations are available upon request to individuals with disabilities.

                                                General Industry Safety and Health Division
                                 7150 Harris Drive  P.O. BOX 30644  LANSING, MICHIGAN 48909-8144
                                      (517) 322-1831
                                            (GISHD Fact Sheet #010  Revised  05/10/2011)

To top