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Other Classes -> Aliphatics, Unsaturated

Flammable agents - 3rd degree

Cyclopentene appears as a colorless liquid. Less dense than water and insoluble in water. Flash point below 0 °F. Vapors heavier than air. Inhalation of high concentrations may be narcotic. Used to make rubber and plastics.

Liquid

Colorless liquid; [CAMEO] Odor like gasoline; [FAHG] Slightly sweetish odor; [Alfa Aesar MSDS]

Danger

H225 (100%): Highly Flammable liquid and vapor [Danger Flammable liquids]

P210, P233, P240, P241, P242, P243, P261, P264, P264+P265, P270, P271, P273, P280, P301+P316, P301+P317, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P317, P319, P321, P330, P331, P332+P317, P337+P317, P362+P364, P370+P378, P403+P233, P403+P235, P405, and P501 (click each P-code to see the statement)

Aggregated GHS information provided per 190 reports by companies from 12 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Danger

H225: Highly Flammable liquid and vapor [Danger Flammable liquids]

Chemical: Cyclopentene

Cyclopentene is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Cyclopentene are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Status: Active Update: 25-02-2021 https://echa.europa.eu/registration-dossier/-/registered-dossier/27532

Cyclopentene: Does not have an individual approval but may be used under an appropriate group standard

The New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.)

Special Hazards of Combustion Products: Vapor may travel considerable distance to a source of ignition and flashback. Explosion may occur under fire condition. (USCG, 1999)

· HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.

May be harmful by inhalation, ingestion, or skin absorption. May cause eye and skin irritation. (USCG, 1999)

CAUTION: Petroleum crude oil (UN1267) may contain TOXIC hydrogen sulphide gas.

May polymerize; High vapor concentrations may have narcotic effects; [CAMEO] May cause smarting and reddening of skin if spilled and allowed to remain on clothes; High vapor concentrations may cause mild smarting of eyes and respiratory system, dizziness, and loss of consciousness; [CHRIS] An irritant that can cause skin burns on prolonged contact; [FAHG] May form explosive peroxides; An irritant; Harmful by ingestion (may cause lung damage by aspiration); Inhalation may cause dizziness or drowsiness; Harmful by ingestion and skin absorption; [Alfa Aesar MSDS] See 1-Pentene.

CYCLOPENTENE may react vigorously with strong oxidizing agents. May react exothermically with reducing agents to release hydrogen gas. In the presence of various catalysts (such as acids) or initiators, may undergo exothermic addition polymerization reactions.

Cyclopentene

UN2246

Class 3 Flammable and combustible liquid (49 eCFR § 173.120)

PG II: the degree of danger presented by the material is medium

Cyclopentene

B: Compounds that form peroxides on concentration (distillation/evaporation)

Clark

· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.

· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area.

INHALATION: Call a physician. If inhaled, remove victim to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.

General First Aid:

Excerpt from ERG Guide 128 [Flammable Liquids (Water-Immiscible)]:

Immediate precautionary measure

Petrochemical Manufacturing

Cyclopentene: ACTIVE