Product Identification

Product Name

2-Amino-4-chloro-5-methylbenzenesulfonic acid

Synonyms

2,6-Diiodocyclohexa-2,5-diene-1,4-dione
2,6-Diiodoquinone
2-Amino-4-chloro-5-methylbenzenesulfonic acid
2B Acid
4-Amino-2-chlorotoluene-5-sulfonic acid
Brilliant Toning Red Amine
Diiodoquinone

CAS

20389-01-9

CAS

88-51-7

Formula

C6H2I2O2

Formula

C7H8ClNO3S

Molecular Weight

359.89

Molecular Weight

221.67

EINECS

243-779-4

EINECS

201-837-6

RTECS

XT6330000

RTECS

DK4725000

RTECS Class

Other

RTECS Class

Primary Irritant

Beilstein/Gmelin

1938943

Beilstein/Gmelin

2727161

Beilstein Reference

3-07-00-03385

Beilstein Reference

3-14-00-02216

Physical and Chemical Properties

Appearance

Crystalline solid.

Solubility in water

Very soluble

Melting Point

180.5

Boiling Point

356

Boiling Point

394

pKa/pKb

12.17 (pKb)

Partition Coefficient

1.27

Partition Coefficient

1.43

Usage

Intermediate for azo pigments.

First Aid Measures

Ingestion

Emesis is not indicated due to the irritant nature of these agents. Charcoal - not recommended; it may promote vomiting and make endoscopic evaluation difficult. Immediately dilute with 4 to 8 ounces (120 to 240 ml) of milk or water (not to exceed 4 ounces/120 ml in a child). Neutralization - neutralization is not indicated. Although these agents are irritants, and therefore should not produce tissue damage, it is almost impossible to assure that a particular substance under a particular set of circumstances would not cause damage. Therefore, each patient should be examined with the idea that mucous membrane damage might have occurred.

Ingestion

Seek medical assistance.

Inhalation

TOXIC; inhalation, ingestion, or skin contact with material may cause severe injury or death. Effects of contact or inhalation may be delayed.

Inhalation

Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.

Inhalation

Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.

Skin

Remove and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.

Skin

Remove contaminated clothing. Wash exposed area with soap and water. If symptoms persist, seek medical attention. Launder clothing before reuse.

Skin

Contact with molten substance may cause severe burns to skin and eyes. See Inhalation.

Eyes

See Inhalation.

Eyes

Immediately flush with running water for at least 20 minutes.

Eyes

Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility. If in a medical facility, sterile saline should be used to irrigate the eyes until the cul de sac is returned to neutrality. Some alkali exposures may require prolonged irrigation.

Handling and Storage

Storage

Keep in a tightly closed container. Sore in a cool, dry location.

Handling

All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.

Hazards Identification

Ingestion

See Inhalation.

Inhalation

Cough, tachypnea, and wheezing are common after inhalation.

Skin

Redness, swelling and pain may occur.

Eyes

Irritation.

Ingestion

Nausea, vomiting and diarrhea are possible if ingested.

Hazards

Contact with metals may evolve flammable hydrogen gas.

EC Risk Phrase

R 20/22 36/37/38

EC Safety Phrase

S 26 36/37/39

UN (DOT)

2811

Exposure Controls/Personal Protection

Personal Protection

Chemical splash goggles in compliance with OSHA regulations are advised; however, OSHA regulations also permit other type safety glasses. Whre chemical resistant gloves. To prevent repeated or prolonged skin contact, wear impervious clothing and boots.

Personal Protection

Wear appropriate protective gloves, clothing and goggles.

Respirators

Wear positive pressure self-contained breathing apparatus (SCBA).

Respirators

Use NIOSH/MSHA approved respirator appropriate for exposure of concern.

Exposure Effects

Prolonged exposure may cause nausea, headache, dizziness and eye damage.

Fire Fighting Measures

Fire Fighting

Extinguish using agent most appropriate for surrounding fire.

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use agent most appropriate to extinguish fire.

Fire Potential

Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.

Accidental Release Measures

Small spills/leaks

ELIMINATE all ignition sources. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.

Small spills/leaks

Evaucuate area and ventilate. Wear protective equipment. Sweep up and place in an appropriate container for disposal. Wash contaminated surfaces.

Stability and Reactivity

Stability

Stable.

Incompatibilities

Strong oxidizing agents.

Decomposition

Toxic and corrosive fumes.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

2811