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Styphnic acid

CAS No. 82-71-3 | PubChem CID 6721
Section 1. Identification
Chemical NameStyphnic acid CAS No.82-71-3
Synonymsstyphnicacid; 2,4,6-trinitroresorcinol Chinese Name2,4,6-三硝基间苯二酚
Molecular FormulaC6H3N3O8 Molecular Weight245.1033
UN No.0219 Data SourcePubChem (NIH/NLM)
GHS Hazard Classification
Signal Word DANGER
Pictograms GHS01 · Explosive GHS07 · Irritant
Hazard Statements H201H302H312H332
Precautionary Statements P210P230P240P250P261P264P270P271P280P301+P317P302+P352P304+P340P317P321P330P362+P364P370+P380P372P373P401P501

Section 2. Hazards Identification

H201: (Deleted) Explosive; mass explosion hazard [Danger Explosives]

H302: Harmful if swallowed [Warning Acute toxicity, oral]

H312: Harmful in contact with skin [Warning Acute toxicity, dermal]

H332: Harmful if inhaled [Warning Acute toxicity, inhalation]

P210, P230, P240, P250, P261, P264, P270, P271, P280, P301+P317, P302+P352, P304+P340, P317, P321, P330, P362+P364, P370+P380, P372, P373, P401, and P501 (click each P-code to see the statement)

H201 (17%): (Deleted) Explosive; mass explosion hazard [Danger Explosives]

H302 (97.9%): Harmful if swallowed [Warning Acute toxicity, oral]

H312 (17%): Harmful in contact with skin [Warning Acute toxicity, dermal]

H332 (97.9%): Harmful if inhaled [Warning Acute toxicity, inhalation]

Aggregated GHS information provided per 47 reports by companies from 5 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website.

P210, P230, P240, P250, P280, P370+P380, P372, P373, P401, and P501 (click each P-code to see the statement)

Section 4. First-Aid Measures

Excerpt from ERG Guide 112 [Explosives - Division 1.1, 1.2, 1.3 or 1.5]:

Refer to the "General First Aid" section. (ERG, 2024)

Section 5. Fire-Fighting Measures

Excerpt from ERG Guide 112 [Explosives - Division 1.1, 1.2, 1.3 or 1.5]:

CARGO FIRE: DO NOT fight fire when fire reaches cargo! Cargo may EXPLODE! Stop all traffic and clear the area for at least 1600 meters (1 mile) in all directions and let burn. Do not move cargo or vehicle if cargo has been exposed to heat.

TIRE OR VEHICLE FIRE: Use plenty of water - FLOOD it! If water is not available, use CO2, dry chemical or dirt. If possible, and WITHOUT RISK, use unmanned master stream devices or monitor nozzles from maximum distance to prevent fire from spreading to cargo area. Pay special attention to tire fires as re-ignition may occur. Stand by, at a safe distance, with extinguisher ready for possible re-ignition. (ERG, 2024)

Section 6. Accidental Release Measures

Excerpt from ERG Guide 112 [Explosives - Division 1.1, 1.2, 1.3 or 1.5]:

IMMEDIATE PRECAUTIONARY MEASURE: Isolate spill or leak area immediately for at least 500 meters (1/3 mile) in all directions.

LARGE SPILL: Consider initial evacuation for 800 meters (1/2 mile) in all directions.

FIRE: If rail car or trailer is involved in a fire, ISOLATE for 1600 meters (1 mile) in all directions; also, initiate evacuation including emergency responders for 1600 meters (1 mile) in all directions. (ERG, 2024)

Section 7. Handling and Storage

Excerpt from ERG Guide 112 [Explosives - Division 1.1, 1.2, 1.3 or 1.5]:

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 or walk through spilled material. DO NOT OPERATE RADIO TRANSMITTERS WITHIN 100 METERS (330 FEET) OF ELECTRIC DETONATORS. DO NOT CLEAN-UP OR DISPOSE OF, EXCEPT UNDER SUPERVISION OF A SPECIALIST. (ERG, 2024)

Section 8. Exposure Controls / Personal Protection

Excerpt from ERG Guide 112 [Explosives - Division 1.1, 1.2, 1.3 or 1.5]:

Wear positive pressure self-contained breathing apparatus (SCBA). Structural firefighters' protective clothing provides thermal protection but only limited chemical protection. (ERG, 2024)

Section 9. Physical and Chemical Properties

Trinitroresorcinol appears as a yellowish, crystalline solid. Used as a priming agent. Very sensitive to heat. Primary hazard is blast of an instantaneous explosion, not flying projectiles or fragments. Under prolonged exposure to fire or heat the containers may explode violently.

CBI; Wet Solid

Yellow solid; [Merck Index] Ellipsoid particles; [Olin Winchester Ammunition MSDS]

Negative

Agilent XCT

Electrospray ionization

ammonia (10nM)

MeCN (80%)

DOI:10.1021/acs.analchem.7b00595

Boiling point

Crystal structure

Formula unit

Fusion temperature

Heat of sublimation

Melting temperature

Phase transition

Space group

Transition enthalpy

Unit cell

Unit cell parameter

Vapor pressure

Other Uses -> Explosives

Flammable agents - 4th degree

Reactive agents - 3rd degree

Section 10. Stability and Reactivity

No rapid reaction with air. No rapid reaction with water.

Nitro, Nitroso, Nitrate, and Nitrite Compounds, Organic

Phenols and Cresols

Explosive

Strong Oxidizing Agent

Aromatic nitro compounds, such as TRINITRORESORCINOL, range from slight to strong oxidizing agents. If mixed with reducing agents, including hydrides, sulfides and nitrides, they may begin a vigorous reaction that culminates in a detonation. The aromatic nitro compounds may explode in the presence of a base such as sodium hydroxide or potassium hydroxide even in the presence of water or organic solvents. The explosive tendencies of aromatic nitro compounds are increased by the presence of multiple nitro groups.

Section 11. Toxicological Information

Occupational hepatotoxin - Secondary hepatotoxins: the potential for toxic effect in the occupational setting is based on cases of poisoning by human ingestion or animal experimentation.

Methemoglobinemia - The presence of increased methemoglobin in the blood; the compound is classified as secondary toxic effect

Section 14. Transport Information

Explosive 1.1D

Source: PubChem CID 6721 (NIH/NLM, public domain). Retrieved from PubChem, a public-domain chemistry database maintained by the U.S. National Library of Medicine. Last updated: 2026-08-02 09:55:49.
Disclaimer: This information is compiled for reference only and does not replace the manufacturer's official Safety Data Sheet. Always consult the supplier's SDS before handling any chemical.