Safety data summary
2-Methylnaphthalene
- CAS 91-57-6
- C11H10
- EC 202-078-3
- Warning
2-Methylnaphthalene (CAS 91-57-6) is a chemical substance with the molecular formula C11H10 and a molecular weight of 142.2 g/mol. Based on GHS classifications notified to ECHA, it carries the signal word “Warning” and is classified as harmful if swallowed, inhaled or absorbed and hazardous to aquatic life. Its label shows the Exclamation Mark and Environment pictograms. Key hazard statements include H302 (harmful if swallowed) and H411 (toxic to aquatic life with long lasting effects).
Hazards at a glance
- H302Harmful if swallowed · 95% of notifications
- H411Toxic to aquatic life with long lasting effects · 10.4% of notifications
European Chemicals Agency (ECHA) — aggregated from 1,564 company reports
1Identification
- Name
- 2-Methylnaphthalene
- IUPAC name
- 2-methylnaphthalene
- CAS number
- 91-57-6
- EC number
- 202-078-3
- Molecular formula
- C11H10
- Molecular weight
- 142.2 g/mol
- InChIKey
- QIMMUPPBPVKWKM-UHFFFAOYSA-N
- SMILES
- CC1=CC2=CC=CC=C2C=C1
- PubChem CID
- 7055
- Synonyms
- beta-Methylnaphthalene, Naphthalene, 2-methyl-, RefChem:476105, .beta.-Methylnaphthalene, Naphthalene, beta-methyl-, 2-methyl-naphthalene, beta-methyl naphthalenes, 2-?Methylnaphthalene, NAPHTALENE,2-METHYL MFC11 H10, 2-Methylnaphthalene, analytical standard, 2-Naphthylmethyl radical, 2-methyInaphthalene, 2-methyl naphthalene, Methyl-2-naphthalene
Recommended uses
- Produced from coal tar and used to make dyes and resins; Used to make vitamin K; Present in asphalt and smoke from burning cigarettes and wood; [ACGIH]Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- The active ingredient is no longer contained in any registered products ... cancelled." /Methylated naphthalenes/Hazardous Substances Data Bank (HSDB)
- Organic synthesis; insecticides.Hazardous Substances Data Bank (HSDB)
- Not Known or Reasonably Ascertainable Intermediate FuelEPA Chemical Data Reporting (CDR)
- IntermediateEPA Chemical Data Reporting (CDR)
Use categories: Fragrance Ingredients
Description
- 2-methylnaphthalene is a white crystalline solid. (NTP, 1992)CAMEO Chemicals
- 2-methylnaphthalene is a methylnaphthalene carrying a methyl substituent at position 2.ChEBI
- 2-methylnaphthalene has been reported in Camellia sinensis, Zea mays, and other organisms with data available.LOTUS - the natural products occurrence database
2Hazard identification
- Signal word
- Warning
- Pictograms
- GHS07, GHS09
- Classification source
- European Chemicals Agency (ECHA)
Precautionary statements
| Code | Statement |
|---|---|
| P264 | Wash hands [and ...] thoroughly after handling. |
| P270 | Do not eat, drink or smoke when using this product. |
| P273 | Avoid release to the environment. |
| P301+P317 | IF SWALLOWED: Get medical help. |
| P330 | Rinse mouth. |
| P391 | Collect spillage. |
| P501 | Dispose of contents/container to ... |
Other reported classifications
4 classification records exist across sources. Differences usually reflect purity, physical form or impurities.
| Source | Signal | Hazard codes |
|---|---|---|
| NITE-CMC | Warning | H319, H335, H336, H373, H401, H411 |
| NITE-CMC | Warning | H302, H319, H335, H336, H373 |
| Hazardous Substances Data Bank (HSDB) | Warning | H302, H315, H319, H335, H401, H411 |
Health hazards
- SYMPTOMS: Symptoms of exposure to this compound may include irritation of the skin, eyes, mucous membranes and upper respiratory tract. It may also cause headaches, nausea, vomiting, diarrhea, anemia, jaundice, euphoria, dermatitis, visual disturbances, convulsions and comatose. ACUTE/CHRONIC HAZARDS: This compound may be harmful by inhalation, ingestion or skin absorption. It is an irritant of the skin, eyes, mucous membranes and upper respiratory tract. When heated to decomposition it emits acrid smoke, irritating fumes and toxic fumes of carbon monoxide and carbon dioxide. (NTP, 1992)CAMEO Chemicals
Fire hazards
- This chemical is combustible. (NTP, 1992)CAMEO Chemicals
- Combustible.ILO-WHO International Chemical Safety Cards (ICSCs)
Hazards summary
- There are no studies of humans exposed to 1-methylnaphthalene or 2-methylnaphthalene. [ATSDR ToxFAQs] Minimal Risk Level (oral chronic) = 0.4 mg/kg/day (Resp.); [ATSDR] 1-Methylnaphthalene (1-MN) and 2-Methylnaphthalene (2-MN) are respiratory tract irritants. [ACGIH] See Naphthalene.Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
- The major hazards encountered in the use and handling of 2-methylnaphthalene stem from its toxicologic properties. Toxic by all routes (ie, ingestion, inhalation, and dermal contact), exposure to this crystaline substance may occur from its production or use as a chemical intermediate in organic syntheses, in insecticides, or as a dye carrier. Effects from exposure may include facial flushing, fever, headache, skin irritation, corneal damage, nausea, anorexia, hemoglobinuria, hepatocellular injury, convulsions, and coma. Before implementing land disposal of waste 2-methylnaphthalene, consult with environmental regulatory agencies for guidance.Hazardous Substances Data Bank (HSDB)
3Composition / information on ingredients
| Substance | CAS | EC | Formula |
|---|---|---|---|
| 2-Methylnaphthalene | 91-57-6 | 202-078-3 | C11H10 |
This page describes the pure substance. Commercial products may be solutions or mixtures. Check Section 3 of your supplier's SDS for concentrations and other ingredients.
4First-aid measures
- EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop. SKIN: IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water.CAMEO Chemicals
Symptoms of exposure
- Cough.ILO-WHO International Chemical Safety Cards (ICSCs)
- Redness. Pain.ILO-WHO International Chemical Safety Cards (ICSCs)
- Acute exposure to PAHs causes irritation and inflammation of the skin and lung tissue. Some symptoms of hemolytic anemia are fatigue, lack of appetite, restlessness, and pale skin. Exposure to large amounts of 2-methylnapthalene may also cause nausea, vomiting, diarrhea, blood in the urine, and a yellow color to the skin. (A10, L12)Toxin and Toxin Target Database (T3DB)
5Fire-fighting measures
- Suitable extinguishing media: Use water spray, alcohol-resistant foam, dry chemical or carbon dioxide.Hazardous Substances Data Bank (HSDB)
- Advice for firefighters: Wear self contained breathing apparatus for fire fighting if necessary.Hazardous Substances Data Bank (HSDB)
6Accidental release measures
Isolation and evacuation
- Excerpt from ERG Guide 171 [Substances (Low to Moderate Hazard)]: 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)CAMEO Chemicals
Spill cleanup
- Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations. Do NOT let this chemical enter the environment.ILO-WHO International Chemical Safety Cards (ICSCs)
- Accidental Release Measures. Personal precautions, protective equipment and emergency procedures: Use personal protective equipment. Avoid dust formation. Avoid breathing vapours, mist or gas. Ensure adequate ventilation. Evacuate personnel to safe areas. Avoid breathing dust. Environmental precautions: Prevent further leakage or spillage if safe to do so. Do not let product enter drains. Discharge into the environment must be avoided. Methods and materials for containment and cleaning up: Pick up and arrange disposal without creating dust. Sweep up and shovel. Keep in suitable, closed containers for disposal.Hazardous Substances Data Bank (HSDB)
- Control of environmental exposure: Prevent further leakage or spillage if safe to do so. Do not let product enter drains. Discharge into the environment must be avoided.Hazardous Substances Data Bank (HSDB)
- Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting. Carefully collect remainder. Then store and dispose of according to local regulations. Do NOT let this chemical enter the environment.Hazardous Substances Data Bank (HSDB)
7Handling and storage
- Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing.ILO-WHO International Chemical Safety Cards (ICSCs)
- Conditions for safe storage, including any incompatibilities: Keep container tightly closed in a dry and well-ventilated place.Hazardous Substances Data Bank (HSDB)
- Safe storage: Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing.Hazardous Substances Data Bank (HSDB)
8Exposure controls / personal protection
| Limit | Value | Source |
|---|---|---|
| ACGIH TLV | 0.5 [ppm], TLV Surface Limit = 3 mg/100 cm2 | Haz-Map, Information on Hazardous Chemicals and Occupational Diseases |
| ACGIH TLV | 8 hr Time Weighted Avg (TWA): 0.5 ppm, skin. | Hazardous Substances Data Bank (HSDB) |
Personal protective equipment
- RECOMMENDED RESPIRATOR: Where the neat test chemical is weighed and diluted, wear a NIOSH-approved half face respirator equipped with an organic vapor/acid gas cartridge (specific for organic vapors, HCl, acid gas and SO2) with a dust/mist filter. (NTP, 1992)CAMEO Chemicals
- Eye/face protection: Face shield and safety glasses Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).Hazardous Substances Data Bank (HSDB)
- Skin protection: Handle with gloves.Hazardous Substances Data Bank (HSDB)
- Body Protection: Complete suit protecting against chemicals, The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.Hazardous Substances Data Bank (HSDB)
9Physical and chemical properties
| Molecular weight | 142.2 g/mol |
|---|---|
| Physical description | 2-methylnaphthalene is a white crystalline solid. (NTP, 1992) CAMEO Chemicals Liquid EPA Chemical Data Reporting (CDR) |
| Color / form | Monoclinic crystals from alcohol Hazardous Substances Data Bank (HSDB) Solid or crystalline Hazardous Substances Data Bank (HSDB) |
| Boiling point | 466 to 468 °F at 760 mmHg (NTP, 1992) CAMEO Chemicals 241.1 °C Hazardous Substances Data Bank (HSDB) 241 °C ILO-WHO International Chemical Safety Cards (ICSCs) |
| Melting point | 94.3 °F (NTP, 1992) CAMEO Chemicals 34.6 °C Hazardous Substances Data Bank (HSDB) 35 °C ILO-WHO International Chemical Safety Cards (ICSCs) |
| Flash point | 208 °F (NTP, 1992) CAMEO Chemicals 98 °C (208.4 °F) Closed cup Hazardous Substances Data Bank (HSDB) 208 °F Occupational Safety and Health Administration (OSHA) |
| Density / specific gravity | 1.0058 at 68 °F (NTP, 1992) - Denser than water; will sink CAMEO Chemicals 1.0058 at 20 °C/4 °C Hazardous Substances Data Bank (HSDB) |
| Vapor pressure | 0.05 [mmHg] Haz-Map, Information on Hazardous Chemicals and Occupational Diseases 0.055 mm Hg at 25 °C Hazardous Substances Data Bank (HSDB) |
| Solubility | less than 1 mg/mL at 70 °F (NTP, 1992) CAMEO Chemicals In water, 24.6 mg/L at 25 °C Hazardous Substances Data Bank (HSDB) Miscible with alcohol and ether Hazardous Substances Data Bank (HSDB) |
| log Kow (LogP) | log Kow = 3.86 Hazardous Substances Data Bank (HSDB) 3.86 ILO-WHO International Chemical Safety Cards (ICSCs) |
| Odor threshold | Odor Threshold Low: 0.01 [ppm] Haz-Map, Information on Hazardous Chemicals and Occupational Diseases |
| Decomposition | Decomposes on heating. This produces acrid smoke and irritating fumes. Hazardous Substances Data Bank (HSDB) |
10Stability and reactivity
Reactivity
- 2-METHYLNAPHTHALENE is incompatible with strong oxidizing agents. It is also incompatible with peroxides and oxygen. (NTP, 1992)CAMEO Chemicals
- Insoluble in water.CAMEO Chemicals
Incompatible materials and hazardous reactions
- It... is incompatible with strong oxidizing agents.Hazardous Substances Data Bank (HSDB)
11Toxicological information
Target organs
- RespiratoryEPA Integrated Risk Information System (IRIS)
Short-term exposure effects
- The substance is irritating to the eyes.ILO-WHO International Chemical Safety Cards (ICSCs)
Long-term exposure effects
- Repeated or prolonged inhalation may cause effects on the lungs.ILO-WHO International Chemical Safety Cards (ICSCs)
12Ecological information
Not available in the public sources we compile. Check Section 12 of the supplier's SDS.
13Disposal considerations
- SRP: Recycle any unused portion of the material for its approved use or return it to the manufacturer or supplier. Ultimate disposal of the chemical must consider: the material's impact on air quality; potential migration in air, soil or water; effects on animal, aquatic and plant life; and conformance with environmental and public health regulations. If it is possible or reasonable use an alternative chemical product with less inherent propensity for occupational harm/injury/toxicity or environmental contamination.Hazardous Substances Data Bank (HSDB)
- The following wastewater treatment technology has been investigated for naphthalene: Biological treatment. /Naphthalene/Hazardous Substances Data Bank (HSDB)
- Waste treatment methods. Product: Offer surplus and non-recyclable solutions to a licensed disposal company. Contaminated packaging: Dispose of as unused product.Hazardous Substances Data Bank (HSDB)
14Transport information
DOT label
- Class 9CAMEO Chemicals
Not available in the public sources we compile. Check Section 14 of the supplier's SDS.
15Regulatory information
- This action promulgates standards of performance for equipment leaks of Volatile Organic Compounds (VOC) in the Synthetic Organic Chemical Manufacturing Industry (SOCMI). The intended effect of these standards is to require all newly constructed, modified, and reconstructed SOCMI process units to use the best demonstrated system of continuous emission reduction for equipment leaks of VOC, considering costs, non air quality health and environmental impact and energy requirements. Alkyl naphthalenes is produced, as an intermediate or a final product, by process units covered under this subpart. /Alkyl Naphthalenes/Hazardous Substances Data Bank (HSDB)
- As the federal pesticide law FIFRA directs, EPA is conducting a comprehensive review of older pesticides to consider their health and environmental effects and make decisions about their continued use. Under this pesticide reregistration program, EPA examines newer health and safety data for pesticide active ingredients initially registered before November 1, 1984, and determines whether the use of the pesticide does not pose unreasonable risk in accordance to newer saftey standards, such as those described in the Food Quality Protection Act of 1996.Hazardous Substances Data Bank (HSDB)
Overview of SDS regulations (OSHA HazCom, WHMIS, REACH/CLP) →
16Other information
Compiled from PubChem CID 7055 and the sources it aggregates (attributed inline). Data retrieved 2026-10-12. This summary describes the pure substance and is not a supplier SDS.
Frequently asked questions about 2-Methylnaphthalene
What is the CAS number for 2-Methylnaphthalene?
The CAS Registry Number for 2-Methylnaphthalene is 91-57-6. Its EC (EINECS) number is 202-078-3.
Is 2-Methylnaphthalene hazardous?
Yes. 2-Methylnaphthalene is classified under GHS with the signal word “Warning”. Hazard statements: H302: Harmful if swallowed; H411: Toxic to aquatic life with long lasting effects.
Is 2-Methylnaphthalene flammable?
2-Methylnaphthalene is not classified as flammable under its primary GHS classification, but a flash point of 208 °F (NTP, 1992) has been reported, so it can burn under some conditions.
Which GHS pictograms apply to 2-Methylnaphthalene?
2-Methylnaphthalene labels carry GHS07 (Exclamation Mark) and GHS09 (Environment).
What are the workplace exposure limits for 2-Methylnaphthalene?
ACGIH TLV: 8 hr Time Weighted Avg (TWA): 0.5 ppm, skin..
What PPE is needed when handling 2-Methylnaphthalene?
RECOMMENDED RESPIRATOR: Where the neat test chemical is weighed and diluted, wear a NIOSH-approved half face respirator equipped with an organic vapor/acid gas cartridge (specific for organic vapors, HCl, acid gas and SO2) with a dust/mist filter. (NTP, 1992)
What is the first aid for 2-Methylnaphthalene exposure?
EYES: First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop. SKIN: IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water.
How should 2-Methylnaphthalene be stored?
Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing.