Product Identification
【Product Name】5,5-Dimethyl-1,3-cyclohexanedione
【Synonyms】Cyclomethone 醛试剂
【CAS】126-81-8
【Formula】C8H12O2
【Molecular Weight】140.18
【EINECS】204-804-4
【RTECS】GV0345000
【RTECS Class】Other
【Merck】13,3268
【Beilstein/Gmelin】471489
【Beilstein Reference】4-07-00-01999

Physical and Chemical Properties
【Appearance】Light yellow - beige - white crystalline powder.
【Solubility in water】Very soluble
【Boiling Point】234
【Vapor Pressure】0.06 (25 C)
【pKa/pKb】5.32 (pKa)
【Partition Coefficient】.15
【Heat Of Vaporization】47.0 kJ/mol
【Heat Of Combustion】-4380 kJ/mol
【Usage】For the separation and identification of aldehydes.

First Aid Measures
【Ingestion】Get medical aid. Wash mouth out with water.
【Inhalation】Remove from exposure to fresh air immediately.
【Skin】Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
【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.
【Handling】Wash thoroughly after handling. Avoid contact with eyes, skin, and clothing. Do not breathe dust, vapor, mist, or gas.

Hazards Identification
【Ingestion】May cause irritation of the digestive tract. May be harmful if swallowed.
【Inhalation】May cause respiratory tract irritation. May be harmful if inhaled.
【Skin】May cause skin irritation. May be harmful if absorbed through the skin.
【Eyes】May cause eye irritation.
【EC Safety Phrase】S 22 24/25

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.
【Poison Class】4

Fire Fighting Measures
【Flash Point】85
【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. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.

Accidental Release Measures
【Small spills/leaks】Vacuum or sweep up material and place into a suitable disposal container.

Stability and Reactivity
【Disposal Code】3
【Stability】No data.
【Incompatibilities】Oxidizing agents.
【Decomposition】Carbon monoxide, carbon dioxide.

Transport Information
【HS Code】2914 29 00