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DIMETHYL-P-PHENYLENEDIAMINE

6.1 - Poison
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The Chemical Identifier fields include common identification numbers, the NFPA diamond U.S. Department of Transportation hazard labels, and a general description of the chemical. The information in CAMEO Chemicals comes from a variety of data sources.
CAS Number UN/NA Number
  • 99-98-9
DOT Hazard Label USCG CHRIS Code
  • Poison
none
NIOSH Pocket Guide International Chem Safety Card
none none
NFPA 704
data unavailable
General Description
Colorless to reddish-violet solid. Used in the production of methylene blue and photographic developer. Used as a chemical intermediate for dyes and diazonium chloride salts and as an analytical reagent to detect chloroamine in water. (EPA, 1998)

The Hazard fields include special hazard alerts air and water reactions, fire hazards, health hazards, a reactivity profile, and details about reactive groups assignments and potentially incompatible absorbents. The information in CAMEO Chemicals comes from a variety of data sources.
Reactivity Alerts
none
Air & Water Reactions
No rapid reaction with air. No rapid reaction with water.
Fire Hazard
When heated to decomposition, it emits toxic fumes of nitrogen oxides. (EPA, 1998)
Health Hazard
Lowest toxic dose with skin effect is 14 mg/kg. Irritant to skin and eyes. (EPA, 1998)
Reactivity Profile
DIMETHYL-P-PHENYLENEDIAMINE neutralizes acids in exothermic reactions to form salts plus water. May be incompatible with isocyanates, halogenated organics, peroxides, phenols (acidic), epoxides, anhydrides, and acid halides. Flammable gaseous hydrogen may be generated in combination with strong reducing agents, such as hydrides. Incompatible with strong oxidizers, strong acids and acid anhydrides. Also incompatible with alkalis (NTP, 1992).
Belongs to the Following Reactive Group(s)
Potentially Incompatible Absorbents

No information available.

The Response Recommendation fields include isolation and evacuation distances, as well as recommendations for firefighting, non-fire response, protective clothing, and first aid. The information in CAMEO Chemicals comes from a variety of data sources.
Isolation and Evacuation
Excerpt from ERG Guide 154 [Substances - Toxic and/or Corrosive (Non-Combustible)]:

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 tank car or highway tank 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, 2024)
Firefighting
Fires involving this material can be controlled with a dry chemical, carbon dioxide or Halon extinguisher. A water spray may also be used. (NTP, 1992)
Non-Fire Response
(Nonspecific -- Phenylenediamine). Do not touch material; stop leak if it can be done without risk. Keep unnecessary people away. Isolate area and deny entry. Stay upwind and out of low areas. For small spills, use shovel to place material into clean, dry container and cover; move containers from spill area. For large spills, dike far ahead to collect for later disposal. (EPA, 1998)
Protective Clothing
For emergency situations, wear a positive pressure, pressure-demand, full facepiece self-contained breathing apparatus (SCBA) or pressure- demand supplied air respirator with escape SCBA and a fully-encapsulating, chemical resistant suit. (EPA, 1998)
DuPont Tychem® Suit Fabrics
No information available.
First Aid
Warning: Dimethyl-p-phenylenediamine is an irritant of the skin and eyes, and is a skin sensitizer.

Signs and Symptoms of Dimethyl-P-Phenylenediamine Exposure: Signs and symptoms of acute exposure to dimethyl-p-phenylenediamine may include irritation of skin and eyes, optic neuritis, lenticular opacities, methemoglobinemia, hypoglycemia, hyper-excitability, and convulsions.

Emergency Life-Support Procedures: Acute exposure to dimethyl-p-phenylenediamine exposure 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 dimethyl-p-phenylenediamine.
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 100% humidified 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. Transport to a health care facility.

Dermal/Eye Exposure:
1. Remove victims from exposure. Emergency personnel should avoid self-exposure to dimethyl-p-phenylenediamine.
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 100% humidified 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. Transport 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 100% humidified 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 alter. Administer charcoal slurry, aqueous or mixed with saline cathartic or sorbitol. Usual charcoal dose: 30 to 100 g in adults and 15 and 30 g in children (1 to 2 g/kg in infants). Administer one dose of a cathartic, mixed with charcoal or given separately.
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. Transport to a health care facility. (EPA, 1998)

The Physical Property fields include properties such as vapor pressure and boiling point, as well as explosive limits and toxic exposure thresholds The information in CAMEO Chemicals comes from a variety of data sources.

Note: For Vapor Density and Specific Gravity, comparing the value to 1.0 can tell you if the chemical will likely sink/rise in air or sink/float in fresh water (respectively). Short phrases have been added to those values below as an aid. However, make sure to also consider the circumstances of a release. The Vapor Density comparisons are only valid when the gas escaping is at the same temperature as the surrounding air itself. If the chemical is escaping from a container where it was pressurized or refrigerated, it may first escape and behave as a heavy gas and sink in the air (even if it has a Vapor Density value less than 1). Also, the Specific Gravity comparisons are for fresh water (density 1.0 g/mL). If your spill is in salt water (density about 1.027 g/mL), you need to adjust the point of comparison. There are some chemicals that will sink in fresh water and float in salt water.
Chemical Formula:
  • C8H12N2
Flash Point: 195°F (NTP, 1992)
Lower Explosive Limit (LEL): data unavailable
Upper Explosive Limit (UEL): data unavailable
Autoignition Temperature: data unavailable
Melting Point: 106 to 127°F (EPA, 1998)
Vapor Pressure: data unavailable
Vapor Density (Relative to Air): 4.69 (NTP, 1992) - Heavier than air; will sink
Specific Gravity: 1.036 at 68°F (EPA, 1998) - Denser than water; will sink
Boiling Point: 504°F at 760 mmHg (EPA, 1998)
Molecular Weight: 136.22 (EPA, 1998)
Water Solubility: less than 1 mg/mL at 68°F (NTP, 1992)
Ionization Energy/Potential: data unavailable
IDLH: data unavailable

AEGLs (Acute Exposure Guideline Levels)

No AEGL information available.

ERPGs (Emergency Response Planning Guidelines)

No ERPG information available.

PACs (Protective Action Criteria)

Chemical PAC-1 PAC-2 PAC-3
Dimethyl-p-phenylenediamine, N,N- (99-98-9) 0.012 mg/m3 0.13 mg/m3 9.9 mg/m3
(DOE, 2024)

The Regulatory Information fields include information from the U.S. Environmental Protection Agency's Title III Consolidated List of Lists, the U.S. Cybersecurity and Infrastructure Security Agency's Chemical Facility Anti-Terrorism Standards, and the U.S. Occupational Safety and Health Administration's Process Safety Management of Highly Hazardous Chemicals Standard List (see more about these data sources).

EPA Consolidated List of Lists

Regulatory Name CAS Number/
313 Category Code
EPCRA 302
EHS TPQ
EPCRA 304
EHS RQ
CERCLA RQ EPCRA 313
TRI
RCRA
Code
CAA 112(r)
RMP TQ
Dimethyl-p-phenylenediamine 99-98-9 10/10000 pounds 10 pounds

(EPA List of Lists, 2024)

CISA Chemical Facility Anti-Terrorism Standards (CFATS)

No regulatory information available.

OSHA Process Safety Management (PSM) Standard List

No regulatory information available.

This section provides a listing of alternate names for this chemical, including trade names and synonyms.
  • 1-AMINO-4-(DIMETHYLAMINO)BENZENE
  • 4-AMINO-N,N-DIMETHYLANILINE
  • 1,4-BENZENEDIAMINE, N,N-DIMETHYL-
  • C.I. 76075
  • CI 76075
  • DIMETHYL-P-PHENYLENEDIAMINE
  • DIMETHYL-PARA-PHENYLENEDIAMINE
  • DIMETHYL-PARAPHENYLENEDIAMINE
  • 4-(DIMETHYLAMINO)ANILINE
  • 4-(DIMETHYLAMINO)BENZENAMINE
  • (4-(DIMETHYLAMINO)PHENYL)AMINE
  • DIMETHYLAMINOANILINE
  • 4-DIMETHYLAMINOANILINE
  • DMPD
  • N,N-DIMETHYL-1,4-BENZENEDIAMINE
  • N,N-DIMETHYL-1,4-DIAMINOBENZENE
  • N,N-DIMETHYL-1,4-PHENYLENEDIAMINE
  • N,N-DIMETHYL-P-BENZENEDIAMINE
  • N,N-DIMETHYL-P-PHENYLENEDIAMINE
  • P-(DIMETHYLAMINO)ANILINE
  • P-(DIMETHYLAMINO)PHENYLAMINE
  • P-AMINO-N,N- DIMETHYLANILINE
  • P-AMINO-N,N-DIMETHYLANILINE
  • P-AMINODIMETHYLANILINE
  • P-DIMETHYLAMINOPHENYLAMINE
  • P-PHENYLENEDIAMINE, N,N-DIMETHYL-

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