Product Identification
【Product Name】5,5'-Methylenedisalicylic acid ；5,5-亚甲基二水杨酸
【Synonyms】2,2'-Dihydroxy-5,5'-methylenedibenzoic acid
【CAS】122-25-8
【Formula】C15H12O6
【Molecular Weight】288.26
【EINECS】204-530-5
【Merck】12,6142

Physical and Chemical Properties
【Appearance】Crystals.
【Solubility in water】Insoluble
【Melting Point】238℃
【Vapor Pressure】8.2E-14 (25℃)
【Density】1.511 g/cm3 (20℃)
【pKa/pKb】2.94 (pKa)
【Partition Coefficient】3.89

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. Wash mouth out with water.
【Inhalation】Remove from exposure and move to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
【Skin】Get medical aid. Flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
【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 cool, dry place. Store in a tightly closed container.

Hazards Identification
【Ingestion】May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.
【Inhalation】May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
【Skin】May cause irritation.
【Eyes】May cause irritation.
【EC Safety Phrase】S: 24/25

Exposure Controls/Personal Protection
【Personal Protection】Wear appropriate protective eyeglasses or chemical safety ggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Wear appropriate protective gloves and clothing to prevent skin exposure.
【Respirators】Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149. Use a NIOSH/MSHA or European Standard EN 149 approved respirator if exposure limits are exceeded or if irritation or other symptoms are experienced.
【Poison Class】3

Fire Fighting Measures
【Fire Fighting】Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extinguish with 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, observing precautions in the Protective Equipment section. Avoid generating dusty conditions. Provide ventilation.

Stability and Reactivity
【Incompatibilities】Oxidizing agents.
【Decomposition】Oxides of carbon.
【Combustion Products】During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion.