Diamond	Hazard	Value	Description
1 3 2	Health	3	Can cause serious or permanent injury.
	Flammability	1	Must be preheated before ignition can occur.
	Instability	2	Readily undergoes violent chemical changes at elevated temperatures and pressures.
	Special

Colorless to yellow or dark liquid or solid with a sweet, fruity, pungent odor. Melting point 68°F (20°C). Evolves CO2 when moist. This can cause over-pressurization in an enclosed space.Toxic and carcinogenic. Used in polyurethane foams, coatings in floor and wood finishes, sealers, paints, concrete sealers for aircraft and tank trucks, elastomers in clay pipe seals, elastomers and coatings, and crosslinking agent for nylon.

Rate of onset: Immediate

Persistence: Hours - weeks

Odor threshold: 0.4 - 2 ppm

Source/use/other hazard: Polyurethane (wood coatings, foam), nylon industries; skin irritant.

• Polymerizable
• Water-Reactive

Reacts with water with the evolution of carbon dioxide and formation of insoluble polyureas that are relatively nontoxic and inert [Merck 11th ed. 1989)].

When heated to decomposition it emits very toxic fumes of cyanide and nitrogen oxides. Reacts violently with amines, alcohol, bases and warm water causing fire and explosion hazards. Avoid strong oxidizers, water, acids, bases, amines, etc., cause foam and splatter. Avoid heating. Hazardous polymerization may occur. Concentrated alkaline compound such as sodium hydroxide or tertiary amines may cause run-away polymerization. Slow, not hazardous polymerization may occur above 235F. (EPA, 1998)

Can cause death. Contact with skin may cause allergic eczema. Substance is very corrosive to eyes. Chronic exposure may cause chronic lung disease. As a vapor TDI is a powerful irritant to the respiratory tract. Chronic loss of respiratory function may occur. Acute asthmatic bronchitis or frank asthma may occur. A splash in the eyes of workmen has caused keratitis and conjunctivitis. This compound causes inflammation of the skin, also chemical pneumonitis and pulmonary edema. (EPA, 1998)

TOLUENE-2,4-DIISOCYANATE is explosive in the form of vapor when exposed to heat, flame or sparks. Undergoes potentially violent polymerization reaction with strong bases or acyl chlorides. Reacts with water to liberate carbon dioxide. Potential explosion if stored in polyethylene containers due to absorption of water through the plastic. Emits very toxic fumes of oxides of nitrogen when heated to decomposition [Lewis, 3rd ed., 1993, p. 1251].

• Isocyanates and Isothiocyanates
• Polymerizable Compounds

Use caution: Liquids with this reactive group classification have been known to react with the absorbents listed below. More info about absorbents, including situations to watch out for...

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

Excerpt from ERG Guide 156 [Substances - Toxic and/or Corrosive (Combustible / 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: Increase the immediate precautionary measure distance, in the downwind direction, as necessary.

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)

If water gets below the surface of the liquid, it will turn to steam and cause frothing. Full protective clothing, including self-contained breathing apparatus, rubber gloves, boots and bands around legs, arms, and waist should be provided. No skin surface should be exposed.

Move container from fire area if you can do it without risk. Cool containers that are exposed to flames with water from the side until well after fire is out. Dike fire control water for later disposal; do not scatter the material.

Water gently applied to surface or foam may cause frothing which will extinguish the fire.

If material is on fire or involved in fire do not extinguish fire unless flow can be stopped. Use water in flooding quantities as fog. Solid streams of water may be ineffective. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use "alcohol" foam, carbon dioxide or dry chemical. Use water spray to absorb vapor. (EPA, 1998)

Caution : Mixing with water may result in a violent reaction. Sources of extreme heat or ignition including sparks or fire may result in formation of toxic nitrogen oxide gases.

Shut off ignition sources; no smoking or flames in hazard area. Do not touch spilled material; stop leak if you can do so without risk. Use water spray to reduce vapors.

Small spills: absorb with sand or other non-combustible absorbent material and place into containers for later disposal.

Small dry spills: with clean shovel place material into clean, dry container and cover; move containers from spill area.

Large spills: dike far ahead of spill for later disposal. Keep unnecessary people away; isolate hazard area and deny entry. Stay upwind; keep out of low areas. Ventilate closed spaces before entering them. If material is not on fire and not involved in fire; keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary; attempt to stop leak if without hazard. Use water spray to knock down vapors. If material is leaking (not on fire), downwind evacuation must be considered. (EPA, 1998)

Excerpt from NIOSH Pocket Guide for Toluene-2,4-diisocyanate:

Skin: PREVENT SKIN CONTACT - Wear appropriate personal protective clothing to prevent skin contact.

Eyes: PREVENT EYE CONTACT - Wear appropriate eye protection to prevent eye contact.

Wash skin:
• WHEN CONTAMINATED - The worker should immediately wash the skin when it becomes contaminated.
• DAILY - The worker should wash daily at the end of each work shift, and prior to eating, drinking, smoking, etc.

Remove: WHEN WET OR CONTAMINATED - Work clothing that becomes wet or significantly contaminated should be removed and replaced.

Change: DAILY - Workers whose clothing may have become contaminated should change into uncontaminated clothing before leaving the work premises.

Provide:
• EYEWASH - Eyewash fountains should be provided in areas where there is any possibility that workers could be exposed to the substances; this is irrespective of the recommendation involving the wearing of eye protection.
• QUICK DRENCH - Facilities for quickly drenching the body should be provided within the immediate work area for emergency use where there is a possibility of exposure. [Note: It is intended that these facilities provide a sufficient quantity or flow of water to quickly remove the substance from any body areas likely to be exposed. The actual determination of what constitutes an adequate quick drench facility depends on the specific circumstances. In certain instances, a deluge shower should be readily available, whereas in others, the availability of water from a sink or hose could be considered adequate.] (NIOSH, 2023)

Normalized Breakthrough Times (in Minutes)

Chemical	CAS Number	State	QS	QC	SL	C3	TF	TP	RC	TK	RF
Toluene diisocyanate, 2,4-	584-84-9	Liquid		imm	>480	>480	>480	>480	>480	>480	>480
Toluene diisocyanate, 2,4- (80%)	584-84-9	Liquid		60	>480	>480	>480	>480	>480	>480	>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)

Signs and Symptoms of Acute Toluene 2,4-Diisocyanate Exposure: Signs and symptoms of acute exposure to toluene 2,4-diisocyanate may be severe and include burning of the skin, eyes, nose, and throat. Cough, laryngitis, chest pain, tightness of the chest, bronchitis, asthma, emphysema, and enlargement of the right side of the heart may also occur. Gastrointestinal effects may include vomiting, diarrhea, and abdominal pain. Headache, insomnia, euphoria, depression, anxiety, paranoia, neuroses, and ataxia (incoordination) may also be noted.

Emergency Life-Support Procedures: Acute exposure to toluene 2,4-diisocyanate may require decontamination and life support for the victims. Emergency personnel should wear protective clothing appropriate to the type and degree of contamination. Air-purifying or supplied-air respiratory equipment should also be worn, as necessary. Rescue vehicles should carry supplies such as plastic sheeting and disposable plastic bags to assist in preventing spread of contamination.

Inhalation Exposure:
1. Move victims to fresh air. Emergency personnel should avoid self-exposure to toluene 2,4-diisocyanate.
2. Evaluate vital signs including pulse and respiratory rate, and note any trauma. If no pulse is detected, provide CPR. If not breathing, provide artificial respiration. If breathing is labored, administer oxygen or other respiratory support.
3. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures.
4. RUSH to a health care facility.

Dermal/Eye Exposure:
1. Remove victims from exposure. Emergency personnel should avoid self- exposure to toluene 2,4-diisocyanate.
2. Evaluate vital signs including pulse and respiratory rate, and note any trauma. If no pulse is detected, provide CPR. If not breathing, provide artificial respiration. If breathing is labored, administer oxygen or other respiratory support.
3. Remove contaminated clothing as soon as possible.
4. If eye exposure has occurred, eyes must be flushed with lukewarm water for at least 15 minutes.
5. Wash exposed skin areas THOROUGHLY with soap and water.
6. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures.
7. RUSH to a health care facility.

Ingestion Exposure:
1. Evaluate vital signs including pulse and respiratory rate, and note any trauma. If no pulse is detected, provide CPR. If not breathing, provide artificial respiration. If breathing is labored, administer oxygen or other respiratory support.
2. DO NOT induce vomiting or attempt to neutralize!
3. Obtain authorization and/or further instructions from the local hospital for administration of an antidote or performance of other invasive procedures.
4. Give the victims water or milk: children up to 1 year old, 125 mL (4 oz or 1/2 cup); children 1 to 12 years old, 200 mL (6 oz or 3/4 cup); adults, 250 mL (8 oz or 1 cup). Water or milk should be given only if victims are conscious and alert.
5. Activated charcoal may be administered if victims are conscious and alert. Use 15 to 30 g (1/2 to 1 oz) for children, 50 to 100 g (1-3/4 to 3-1/2 oz) for adults, with 125 to 250 mL (1/2 to 1 cup) of water.
6. Promote excretion by administering a saline cathartic or sorbitol to conscious and alert victims. Children require 15 to 30 g (1/2 to 1 oz) of cathartic; 50 to 100 g (1-3/4 to 3-1/2 oz) is recommended for adults.
7. RUSH to a health care facility. (EPA, 1998)

• BENZENE, 2,4-DIISOCYANATO-1-METHYL
• BENZENE, 2,4-DIISOCYANATO-1-METHYL-
• CRESORCINOL DIISOCYANATE
• DESMODUR T80
• DI-ISO-CYANATOLUENE
• 2,4-DICYANATO-1-METHYLPHENYLENE
• 2,4-DIISOCYANATO-1-METHYL- BENZENE
• 2,4-DIISOCYANATO-1-METHYLBENZENE
• 1,3-DIISOCYANATO-4-METHYLBENZENE
• 2,4-DIISOCYANATOTOLUENE
• HYLENE T
• HYLENE TCPA
• HYLENE TLC
• HYLENE TM
• HYLENE TM-65
• HYLENE TRF
• ISOCYANIC ACID, 4-METHYL-M-PHENYLENE ESTER
• ISOCYANIC ACID, METHYLPHENYLENE ESTER
• M-TOLYLENE DIISOCYANATE
• META-TOLUENE DIISOCYANATE
• 4-METHYL-1,3-PHENYLENE DIISOCYANATE
• 4-METHYL-M-PHENYLENE DIISOCYANATE
• 4-METHYL-M-PHENYLENE ISOCYANATE
• 4-METHYL-PHENYLENE DIISOCYANATE
• 4-METHYL-PHENYLENE ISOCYANATE
• MONDUR TD
• MONDUR TD-80
• MONDUR TDS
• NACCONATE 100
• NACCONATE I00
• NCI-C50533
• NIAX TDI
• NIAX TDI-P
• RUBINATE TDI 80/20
• TDI
• TDI-80
• 2,4-TDI
• TOLUENE 2,4-DIISOCYANATE
• TOLUENE DIISOCYANATE
• 2,4-TOLUENE DIISOCYANATE
• TOLUENE, 2,4-DIISOCYANATO-
• TOLUENE-2,4-DIISOCYANATE
• 2,4-TOLUENEDIISOCYANATE
• 2,4-TOLUYLENE DIISOCYANATE
• TOLUYLENE-2,4-DIISOCYANATE
• TOLYENE 2,4-DIISOCYANATE
• TOLYENE-2,4-DIISOCYANATE
• TOLYLENE DIISOCYANATE
• 2,4-TOLYLENE DIISOCYANATE
• TOLYLENE-2,4-DIISOCYANATE
• 2,4-TOLYLENEDIISOCYANATE