Product Identification
【Product Name】2,4-Diaminobenzenesulfonic acid
【Synonyms】p-Butylbenzoic acid ；2,4-二氨基苯磺酸
【CAS】88-63-1
【Formula】C6H8N2O3S
【Molecular Weight】188.2
【EINECS】243-940-9
【RTECS】Primary Irritant
【Beilstein/Gmelin】2044046
【Beilstein Reference】2-14-00-00443

Physical and Chemical Properties
【Appearance】White crystalline powder.
【Solubility in water】Very soluble
【Melting Point】313
【Boiling Point】406
【pKa/pKb】2.90 (pKa)
【Partition Coefficient】-.41

First Aid Measures
【Ingestion】Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
【Inhalation】May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
【Skin】May cause eye irritation.
【Eyes】Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Handling and Storage
【Storage】Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
【Handling】Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Hazards Identification
【Ingestion】May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.
【Inhalation】Causes respiratory tract irritation. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema. May be harmful if inhaled. May cause burning sensation, coughing, wheezing, laryngitis, shortness of breath, headache, nausea, and vomiting.
【Skin】Causes skin irritation. May be harmful if absorbed through the skin.
【Eyes】Causes eye irritation.

Exposure Controls/Personal Protection
【Personal Protection】Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
【Respirators】Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Fire Fighting Measures
【Fire Fighting】Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguishing media: Use foam, dry chemical, or carbon dioxide.
Accidental Release Measures
【Small spills/leaks】Vacuum or sweep up material and place into a suitable disposal container. Clean up spills immediately, using the appropriate protective equipment. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity
【Stability】Stable under normal temperatures and pressures.
【Incompatibilities】Strong oxidizing agents, acids, acid chlorides, carbon dioxide, acid anhydrides.
【Decomposition】Nitrogen oxides, carbon monoxide, oxides of sulfur, carbon dioxide.