What is methylenedianiline used for?
4,4′-Methylenedianiline is used mainly for making poly urethane foams, which have a variety of uses, such as insulat ing materials in mailing containers. It is also used for making coating materials, glues, Spandex® fiber, dyes, and rubber.
What is MDA in OSHA?
4,4′ Methylenedianiline or MDA means the chemical, 4,4′-diaminodiphenylmethane, Chemical Abstract Service Registry number 101-77-9, in the form of a vapor, liquid, or solid. The definition also includes the salts of MDA.
What must employers provide for workers exposed to MDA?
The employer must provide personal protective equipment and clothing, at no cost to the employee, and ensure their proper use when the employee is subject to dermal exposure to MDA; where liquids containing MDA can be splashed into the eyes; or where airborne concentrations of MDA are in excess of the PEL.
What is the permissible exposure limit to MDA in 8 hours?
10 ppb is the permissible exposure limit to MDA when using an 8-hour time-weighted average.
What is the use of diphenylamine reagent?
Diphenylamine dissolves well in many common organic solvents, and is moderately soluble in water. It is used mainly for its antioxidant properties. Diphenylamine is widely used as an industrial antioxidant, dye mordant and reagent and is also employed in agriculture as a fungicide and antihelmintic.
What is the recommended protective clothing and equipment for MDA exposed workers?
You may be required to wear coveralls, aprons, gloves, face shields, or other appropriate protective clothing to prevent skin contact with MDA.
How is TWA determined?
(2) The eight-hour time-weighted average sound level (TWA), in decibels, may be computed from the dose, in percent, by means of the formula: TWA = 16.61 log(10) (D/100) + 90. For an eight-hour workshift with the noise level constant over the entire shift, the TWA is equal to the measured sound level.
When can you use the cross bracing given?
The top of a non-self-supporting ladder must be placed with two rails supported equally unless it is equipped with a single-support attachment. Do not use cross bracing on the rear section of stepladders for climbing unless the ladders are designed and provided with steps for climbing on both front and rear sections.
What is the most effective way to clean lead contaminated clothing?
If you are exposed to lead and your employer does not launder your clothing, you should take the clothing home in a plastic bag and put the clothing directly into the washing machine. You should use detergents to remove lead. Other clothing should not be washed with the work clothing.
How many years must employers keep accurate?
EEOC Regulations require that employers keep all personnel or employment records for one year. If an employee is involuntarily terminated, his/her personnel records must be retained for one year from the date of termination.
How harmful is phosgene?
Phosgene is extremely toxic by acute (short-term) inhalation exposure. Severe respiratory effects, including pulmonary edema, pulmonary emphysema, and death have been reported in humans. Severe ocular irritation and dermal burns may result following eye or skin exposure.
What is the scope and application of methylenedianiline?
Methylenedianiline. Scope and application. This section applies to all construction work as defined in 29 CFR 1910.12 (b), in which there is exposure to MDA, including but not limited to the following: Construction, alteration, repair, maintenance, or renovation of structures, substrates, or portions thereof, that contain MDA;
Is the smell of 4, 4’methylenedianiline toxic?
4,4′-DIAMINODIPHENYLMETHANE is a tan flake or lump solid with a faint fishlike odor. May be toxic by inhalation or ingestion, and may be irritating to skin.
What kind of damage can MDA do to humans?
4,4′-Methylenedianiline (MDA) is primarily used to produce 4,4′-methylenedianline diisocyanate and other polymeric isocyanates. Acute (short-term) oral and dermal exposure to MDA causes liver damage in humans and animals.
When was 4, 4 ′-Methylenedianiline ( MDA ) identified as a carcinogen?
The purpose of this bulletin is to disseminate recent information on the potential carcinogenicity of 4,4′-methylenedianiline (MDA) previously identified by NIOSH in 1976 in CIB No. 8 as 4,4′-diaminodiphenylmethane (DDM).