Cyclopentane

  • Pentamethylene
Formula C5H10
Structure
Description Colorless liquid.
Uses Commonly used for cracking aromatics. Commercially, used to produce a variety of analgesics, sedatives, hypnotics, antitumor agents, cns depressants, prostaglandins, insecticides, and many other products.

Registry Numbers and Inventories.
CAS 287-92-3
EC (EINECS/ELINCS) 206-016-6
EC Index Number 601-030-00-2
EC Class Highly flammable; Dangerous for the Environment
EC Risk Phrase R 11 52/53
EC Safety Phrase S 9 16 29 33 61
RTECS GY2390000
RTECS class Other
UN (DOT) 1146
Merck 13,2769
Beilstein/Gmelin 1900195
Beilstein Reference 4-05-00-00014
Swiss Giftliste 1 G-1465
Canada DSL/NDSL DSL
US TSCA Listed
Austrailia AICS Listed
New Zealand Listed
Japan ENCS (MITI) Listed
Korea ECL Listed

Properties.
Formula C5H10
Formula mass 70.13
Melting point, °C -93.3
Boiling point, °C 49
Vapor pressure, mmHg 318 (20 C)
Vapor density (air=1) 2.4
Saturation Concentration 53% (530000 ppm) at 31 C (calculated)
Critical temperature 238.6
Critical pressure 44.4
Density 0.746 G/CM3 (20 C)
Solubility in water Insoluble
Viscosity 0.44 cp @ 20C
Surface tension 23 g/s2
Refractive index 1.4068 (20 C)
Dielectric constant 1.9 (20 C)
Partition coefficient, pKow 3.00
Heat of fusion 0.60 kJ/mol
Heat of vaporization 28.5 kJ/mol
Heat of combustion -3322 kJ/mol

Hazards and Protection.
Storage Keep away from sources of ignition. Store in a tightly closed container. Flammables-area.
WHMIS B2
Handling Wash thoroughly after handling. Use only in a well ventilated area. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. 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.
Small spills/leaks Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition.
Disposal code 1
Stability Stable under normal temperatures and pressures.
Incompatibilities Strong oxidizing agents
Decomposition Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C -42
Autoignition, °C 380
Upper exp. limit, % 8.7
Lower exp. limit, % 1.5
Fire fighting Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Extremely flammable. Material will readily ignite at room temperature. Extinguishing media: Use water spray to cool fire-exposed containers. Use foam, dry chemical, or carbon dioxide.
Fire potential Flammable, dangerous fire risk.
Hazards Containers may explode.
Combustion products Fire may produce irritating, corrosive and/or toxic gases.
NFPA Health 1
  Flammability 3  
  Reactivity 0  

Health.
Exposure limit(s) TLV: 600 ppm; 1720 mg/m3 (as TWA) (ACGIH 1993-1994). NIOSH REL: TWA 600 ppm (1720 mg/m3)
Poison_Class -
Exposure effects CNS depression and dizziness may be expected after exposure to moderate to high concentrations of the vapor.
   Ingestion May cause irritation of the digestive tract. May cause central nervous system depression.
   Inhalation Inhalation of high concentrations may cause central nervous system effects characterized by headache, dizziness, unconsciousness and coma. May cause respiratory tract irritation. May cause drowsiness, unconsciousness, and central nervous system depression.
   Skin May cause skin irritation.
   Eyes May cause eye irritation.

First aid
 
   Ingestion Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Possible aspiration hazard. Get medical aid.
   Inhalation Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin Get medical aid if irritation develops or persists. Flush skin with plenty of soap and water.
   Eyes Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number 1146
Response guide 128
Hazard class 3
Packing Group II  
USCG CHRIS Code CYP  
USCG Compatatibility Group 31 Paraffins
HS Code 2902 19 90  
Std. Transport # 4908135  
IMO Chemical Code 17
IMO Pollution Category C
IMO Hazard code P