2,7-Dimethylpyrene

  • Pyrene, 2,7-dimethyl-
Formula
C18H14
Structure

Registry Numbers and Inventories.
CAS
15679-24-0
EC (EINECS/ELINCS)
239-762-6
UN (DOT)
3295
Beilstein/Gmelin
1868680
Beilstein Reference
4-05-00-02494

Properties.
Formula
C18H14
Formula mass
230.31
Melting point, °C
230-233
Boiling point, °C
395
Critical temperature
628
Critical pressure
24.0
Solubility in water
Insoluble
Partition coefficient, pKow
5.32

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
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.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Make no contact with the spilled material. ELIMINATE all ignition sources and ground all equipment. Stop leak if you can do it without risk. A vapor suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. Use clean non-sparking tools to collect absorbed material.
Stability
No data.

Fire.
Fire fighting
Use of water spray when fighting fire may be inefficient. Small Fires: Dry chemical, carbon dioxide, water spray or alcohol-resistant foam. Large Fires: Water spray, fog or alcohol-resistant foam. Use water spray or fog; do not use straight streams.
Fire potential
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure effects
In experimental animal studies, PAHs and metabolites cross the placenta. Female offspring of experimental animals exposed to PAHs during pregnancy have a decrease in the number of functional oocytes, sometimes such that they are infertile. <br>PAHs are lipophilic and are excreted in breast milk, allowing for secondary exposure of nursing infants, although the potential significance of such exposure has not been determined.
   Ingestion
Leukoplakia and cancers of the lip and oral cavity can develop with chronic exposure.
   Inhalation
Irritation, chronic cough, bronchitis, and bronchogenic cancer can occur with chronic exposure.
   Skin
Coal tar warts (precancerous lesions enhanced by uv light exposure), erythema, dermal burns, acneiform lesions, photosensitization and cancer may develop following chronic exposure.
   Eyes
See Skin.

First aid
 
   Ingestion
Toxicity from these substances involves chronic exposure, toxicity after acute ingestions is unlikely and gastric decontamination is generally not indicated.
   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.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists. Treat dermal irritation or burns with standard topical therapy. Patients developing dermal hypersensitivity reactions may require treatment with systemic or topical corticosteroids or antihistamines.
   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.

Transport.
UN number
3295
Response guide
Hazard class
3
Packing Group
I; II; III