UN/NA Number Reference

UN 1303: Vinylidene chloride, stabilized

49 CFR 172.101 Hazardous Materials Table·ERG 2024

DOT Classification and Shipping

UN 1303 is assigned the proper shipping name Vinylidene chloride, stabilized in the U.S. DOT Hazardous Materials Table (49 CFR 172.101). It is classified as a Class 3 Flammable Liquid material, Packing Group I. Required label(s): 3.

Packing group indicates the degree of danger within a hazard class: PG I is high danger, PG II medium, PG III low. The proper shipping name, hazard class, UN number, and packing group together form the basic shipping description that must appear on shipping papers and, where required, on the package and placard.

Emergency Response (ERG Guide 130)

Hazards: Flammable. Toxic vapor. Harmful if inhaled or absorbed. May accumulate in low areas.

Fire: Dry chemical, CO2, foam, water spray. Do not use straight streams.

Spill: Eliminate ignition sources. Stop leak. Absorb with sand/earth. Prevent waterway contamination.

Chemical and Physical Properties

Vinylidene chloride, stabilized appears as a clear colorless liquid with a chloroform-like odor. Flash point 0 °F. Boiling point 99 °F. Denser (at 10.1 lb / gal) than water and insoluble in water. Hence sinks in water. May polymerize exothermically if heated or contaminated. If the polymerization takes place inside a container, the container may rupture violently. Vapors heavier than air.

CAS Number: 75-35-4

Molecular Formula: C2H2Cl2

Molecular Weight: 96.94 g/mol

Color / Form: Colorless liquid

Odor: Mild, sweet odor resembling that of chloroform

Boiling Point: 89°F (32°C)

Melting Point: -188.5 °F (NTP, 1992)

Flash Point: -18°F (-28°C)

Autoignition: 1058 °F (USCG, 1999)

Specific Gravity: 1.21 (sinks in water)

Vapor Pressure: 500 mmHg at 68 °F ; 591 mmHg at 77 °F (NTP, 1992)

Vapor Density: 3.34 (heavier than air)

Water Solubility: Insoluble

Log P: log Kow = 2.13

Regulatory Data

CERCLA RQ (40 CFR 302.4)

100 lb

OSHA PEL

none

NIOSH REL

IDLH

Ca [N

RCRA Waste Code(s)

[object Object], [object Object]

A release of this material at or above its CERCLA reportable quantity (100 lb) requires immediate notification to the National Response Center at 800-424-8802.

Special Provisions

49 CFR 172.102 special provision codes for this entry: 387, T12, TP2, TP7. These codes modify the general requirements (packaging, quantity limits, exceptions) for this specific material. Look up each code in 49 CFR 172.102 for the full text.

Need the full interactive record? Open UN 1303 in the SpillNerd lookup tool for the live database entry with placard graphics, GHS pictograms, full segregation tables, and synonym search. For another material, use the UN number and chemical lookup.

Reference data compiled from the DOT Hazardous Materials Table (49 CFR 172.101), the 2024 Emergency Response Guidebook, and public chemical databases (PubChem, NIOSH, EPA). Always verify the correct shipping description against the current regulation and the manufacturer's SDS Section 14 before shipping.