N-BUTYL CHLOROFORMATE

A colorless liquid. Flash point near 70°F. Very toxic by inhalation. Denser than water. Used to make other chemicals.

• Highly Flammable
• Water-Reactive

Highly flammable. Decomposes exothermically in water to give hydrochloric acid and organic acids.

Special Hazards of Combustion Products: Irritating and toxic hydrogen chloride and phosgene may be formed.

Behavior in Fire: Vapor is heavier than air and may travel a considerable distance to a source of ignition and flashback. (USCG, 1999)

Inhalation of vapor irritates nose and throat and can cause delayed pulmonary edema. Liquid irritates eyes and causes severe skin burns and irreversible skin damage if allowed to remain. Can cause blindness. Ingestion causes burns of mouth and stomach. (USCG, 1999)

N-BUTYL CHLOROFORMATE is incompatible with bases (including amines), with water, with strong oxidizing agents, with alcohols. May react vigorously or explosively if mixed with diisopropyl ether or other ethers in the presence of trace amounts of metal salts [J. Haz. Mat., 1981, 4, 291].

• Acyl Halides, Sulfonyl Halides, and Chloroformates

Use caution: Liquids with this reactive group classification have been known to react with the absorbents listed below.

• Cellulose-Based Absorbents
• Mineral-Based & Clay-Based Absorbents
• Dirt/Earth

Excerpt from 155 [Substances - Toxic and/or Corrosive (Flammable / Water-Sensitive)]:

IMMEDIATE PRECAUTIONARY MEASURE: Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.

SPILL: See ERG Table 1 - Initial Isolation and Protective Action Distances on the UN/NA 2743 datasheet.

FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2020)

Excerpt from 155 [Substances - Toxic and/or Corrosive (Flammable / Water-Sensitive)]:

Note: Most foams will react with the material and release corrosive/toxic gases. CAUTION: For Acetyl chloride (UN1717), use CO2 or dry chemical only.

SMALL FIRE: CO2, dry chemical, dry sand, alcohol-resistant foam.

LARGE FIRE: Water spray, fog or alcohol-resistant foam. FOR CHLOROSILANES, DO NOT USE WATER; use AFFF alcohol-resistant medium-expansion foam. If it can be done safely, move undamaged containers away from the area around the fire. Avoid aiming straight or solid streams directly onto the product.

FIRE INVOLVING TANKS OR CAR/TRAILER LOADS: Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles. Do not get water inside containers. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire. (ERG, 2020)

Excerpt from 155 [Substances - Toxic and/or Corrosive (Flammable / Water-Sensitive)]:

ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area. All equipment used when handling the product must be grounded. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. A vapor-suppressing foam may be used to reduce vapors. FOR CHLOROSILANES, use AFFF alcohol-resistant medium-expansion foam to reduce vapors. DO NOT GET WATER on spilled substance or inside containers. Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material. Prevent entry into waterways, sewers, basements or confined areas.

SMALL SPILL: Cover with DRY earth, DRY sand or other non-combustible material followed with plastic sheet to minimize spreading or contact with rain. Use clean, non-sparking tools to collect material and place it into loosely covered plastic containers for later disposal. (ERG, 2020)

NIOSH approved airline respirator with full face piece; chemical protective gloves and clothing. (USCG, 1999)

Normalized Breakthrough Times (in Minutes)

Chemical	CAS Number	State	QS	QC	SL	C3	TF	TP	RC	TK	RF
Butylchloroformate	592-34-7	Liquid					>480

Special Warning from DuPont: Tychem® and Tyvek® fabrics should not be used around heat, flames, sparks or in potentially flammable or explosive environments. Only...

(DuPont, 2023)

INHALATION: Remove victim from exposure; if breathing stops, administer artificial respiration; If breathing is difficult, give oxygen; call physician.

EYES: Irrigate with copious amounts of water for at least 15 min.; call physician if needed.

SKIN: Flush with water for 15 min.; get medical attention for burns.

INGESTION: Give large amounts of water; do NOT induce vomiting; get medical attention. (USCG, 1999)

• BUTOXYCARBONYL CHLORIDE
• BUTYL CHLOROCARBONATE
• BUTYL CHLOROFORMATE
• BUTYLCHLOROFORMATE
• CARBONOCHLORIDIC ACID, BUTYL ESTER
• CHLOROCARBONIC ACID, N-BUTYL ESTER
• CHLOROFORMIC ACID BUTYL ESTER
• CHLOROFORMIC ACID, N-BUTYL ESTER
• FORMIC ACID, CHLORO-, BUTYL ESTER
• N-BUTYL CHLOROCARBONATE
• N-BUTYL CHLOROFORMATE