CAS No.: 1321-94-4 Formula: C11H10 Molecular Weight: 142.19700
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CAS No.: 1321-94-4 Formula: C11H10 Molecular Weight: 142.19700
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Basic Info

Chemical Name Methylnaphthalene

Mixed Methylnaphthalene; 1(or2)-Methylnaphthalene; Naphthalene, methyl-; Mix-methylnaphthalene; monomethylnaphthalene;

CAS No. 1321-94-4
Molecular Formula C11H10
Molecular Weight 142.19700
PSA 0.00000
LogP 3.14820


Appearance & Physical State Light Brown-red liquid
Density 1.016 g/cm3
Boiling Point 242.8ºC at 760 mmHg
Flash Point 82.2ºC
Refractive Index 1.616
Vapor Pressure 0.0518mmHg at 25°C

Safety Info

HS Code 2902909090
Packing Group III
SDS 1.0 Expand

SDS 1.0

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According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 14, 2017

Revision Date: Aug 14, 2017


1.1 GHS Product identifier

Product name Methylnaphthalene

1.2 Other means of identification

Product number -
Other names 1(or2)-Methylnaphthalene

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Food additives -> Flavoring Agents
Uses advised against no data available

1.4 Supplier's details

Company MOLBASE (Shanghai) Biotechnology Co., Ltd.
Address Floor 4 & 5, Building 12, No. 1001 North Qinzhou Road,
Xuhui District, Shanghai, China
Telephone +86(21)64956998
Fax +86(21)54365166

1.5 Emergency phone number

Emergency phone number +86-400-6021-666
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

2.Hazard identification

2.1 Classification of the substance or mixture

Acute toxicity - Oral, Category 4

Eye irritation, Category 2

Specific target organ toxicity – single exposure, Category 3

Specific target organ toxicity – repeated exposure, Category 2

Hazardous to the aquatic environment, long-term (Chronic) - Category Chronic 2

2.2 GHS label elements, including precautionary statements

Signal word


Hazard statement(s)

H302 Harmful if swallowed

H319 Causes serious eye irritation

H335 May cause respiratory irritation

H336 May cause drowsiness or dizziness

H373 May cause damage to organs through prolonged or repeated exposure

H411 Toxic to aquatic life with long lasting effects

Precautionary statement(s)

P264 Wash ... thoroughly after handling.

P270 Do not eat, drink or smoke when using this product.

P280 Wear protective gloves/protective clothing/eye protection/face protection.

P261 Avoid breathing dust/fume/gas/mist/vapours/spray.

P271 Use only outdoors or in a well-ventilated area.

P260 Do not breathe dust/fume/gas/mist/vapours/spray.

P273 Avoid release to the environment.


P301+P312 IF SWALLOWED: Call a POISON CENTER/doctor/…if you feel unwell.

P330 Rinse mouth.

P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

P337+P313 If eye irritation persists: Get medical advice/attention.

P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.

P312 Call a POISON CENTER/doctor/…if you feel unwell.

P314 Get medical advice/attention if you feel unwell.

P391 Collect spillage.


P403+P233 Store in a well-ventilated place. Keep container tightly closed.

P405 Store locked up.


P501 Dispose of contents/container to ...

2.3 Other hazards which do not result in classification


3.Composition/information on ingredients

3.1 Substances

Chemical name Common names and synonyms CAS number EC number Concentration
Methylnaphthalene Methylnaphthalene 1321-94-4 none 100%

4.First-aid measures

4.1 Description of necessary first-aid measures

General advice

Consult a physician. Show this safety data sheet to the doctor in attendance.

If inhaled

Fresh air, rest.

In case of skin contact

Remove contaminated clothes. Rinse and then wash skin with water and soap.

In case of eye contact

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

If swallowed

Rinse mouth. Give a slurry of activated charcoal in water to drink. Rest. Refer for medical attention .

4.2 Most important symptoms/effects, acute and delayed

SYMPTOMS: Exposure to this compound may cause skin irritation. It may also cause photosensitization. The vapors, fumes or direct contact with the solid may be irritating to the eyes. Inhalation of the vapors may produce airway irritation, headache, nausea, weakness and collapse. Long term overexposure has led to corneal changes. Ingestion may lead to systemic poisoning involving the gastrointestinal tract, kidneys and blood-forming tissue. Individuals with erythrocytic glucose-6-phosphate dehydrogenase deficiency may be particularly susceptible to possible hemolytic effects. Individuals with a history of or pre-existing disease in eyes, mucous membranes, skin, blood-forming tissues or blood, liver or lungs may be at greater risk of adverse health effects when exposed to this material. ACUTE/CHRONIC HAZARDS: This compound can cause skin irritation and photosensitization. It may be harmful if inhaled or absorbed through the skin, and may be highly toxic if swallowed. When heated to decomposition this compound emits acrid smoke and fumes.

Harmful if inhaled. Liquid causes irritation of the eyes and skin and skin photosensitization. Harmful if swallowed. Chronic exposure may cause liver or kidney damage. (USCG, 1999)

4.3 Indication of immediate medical attention and special treatment needed, if necessary

Emergency and supportive measures: 1. Maintain an open air way and assist ventilation if necessary. 2. Treat coma and seizures if they occur. 3. Treat hemolysis and resulting hemoglobinuria if they occur by intravenous hydration and urinary alkalinization. /Naphthalene/

5.Fire-fighting measures

5.1 Extinguishing media

Suitable extinguishing media

If material on fire or involved in fire: Use water in flooding quantities as fog. Solid streams of water may be ineffective. Solid streams of water may spread fire. Use foam, dry chemical, or carbon dioxide. /Methylnaphthalenes, liquid/

5.2 Specific hazards arising from the chemical

This chemical is probably combustible.

This chemical is combustible.

5.3 Special protective actions for fire-fighters

Wear self-contained breathing apparatus for firefighting if necessary.

6.Accidental release measures

6.1 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. For personal protection see section 8.

6.2 Environmental precautions

Collect leaking and spilled liquid in sealable containers as far as possible. Absorb remaining liquid in sand or inert absorbent. Then store and dispose of according to local regulations. Do NOT let this chemical enter the environment.

6.3 Methods and materials for containment and cleaning up

If you spill this chemical, FIRST REMOVE ALL SOURCES OF IGNITION. Then, use absorbent paper to pick up all liquid spill material. Your contaminated clothing and absorbent paper should be sealed in a vapor-tight plastic bag for eventual disposal. Solvent wash all contaminated surfaces with 60-70% ethanol followed by washing with a soap and water solution. Do not reenter the contaminated area until the Safety Officer (or other responsible person) has verified that the area has been properly cleaned.

7.Handling and storage

7.1 Precautions for safe handling

Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Avoid exposure - obtain special instructions before use.Provide appropriate exhaust ventilation at places where dust is formed. For precautions see section 2.2.

7.2 Conditions for safe storage, including any incompatibilities

Store in an area without drain or sewer access. Provision to contain effluent from fire extinguishing.You should store this material under ambient temperatures.

8.Exposure controls/personal protection

8.1 Control parameters

Occupational Exposure limit values

no data available

Biological limit values

no data available

8.2 Appropriate engineering controls

Handle in accordance with good industrial hygiene and safety practice. Wash hands before breaks and at the end of workday.

8.3 Individual protection measures, such as personal protective equipment (PPE)

Eye/face protection

Safety glasses with side-shields conforming to EN166. Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).

Skin protection

Wear impervious clothing. The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace. Handle with gloves. Gloves must be inspected prior to use. Use proper glove removal technique(without touching glove's outer surface) to avoid skin contact with this product. Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. Wash and dry hands. The selected protective gloves have to satisfy the specifications of EU Directive 89/686/EEC and the standard EN 374 derived from it.

Respiratory protection

Wear dust mask when handling large quantities.

Thermal hazards

no data available

9.Physical and chemical properties

Physical state Light Brown-red liquid
Colour Colorless liquid or oil
Odour no data available
Melting point/ freezing point --13.33°C
Boiling point or initial boiling point and boiling range 242.8ºC at 760 mmHg
Flammability Combustible.
Lower and upper explosion limit / flammability limit no data available
Flash point 82.2ºC
Auto-ignition temperature 528.89°C (USCG, 1999)
Decomposition temperature no data available
pH no data available
Kinematic viscosity no data available
Solubility less than 1 mg/mL at 17.78°C
Partition coefficient n-octanol/water (log value) log Kow of 3.87
Vapour pressure 0.0518mmHg at 25°C
Density and/or relative density 1.016 g/cm3
Relative vapour density 4.91 (Relative to Air)
Particle characteristics no data available

10.Stability and reactivity

10.1 Reactivity

no data available

10.2 Chemical stability

This chemical is stable under normal laboratory conditions. Solutions of this chemical in water, DMSO, 95% ethanol or acetone should be stable for 24 hours under normal lab conditions.

10.3 Possibility of hazardous reactions

Moderate fire risk.METHYLNAPHTHALENE is incompatible with strong oxidizing agents. It is also incompatible with peroxides and oxygen.

10.4 Conditions to avoid

no data available

10.5 Incompatible materials

This compound is incompatible with strong oxidizers.

10.6 Hazardous decomposition products

When heated to decomposition it emits acrid smoke and irritating fumes

11.Toxicological information

Acute toxicity

  • Oral: LD50 Rat oral 1840 mg/kg
  • Inhalation: no data available
  • Dermal: no data available

Skin corrosion/irritation

no data available

Serious eye damage/irritation

no data available

Respiratory or skin sensitization

no data available

Germ cell mutagenicity

no data available


A4; Not classifiable as a human carcinogen.

Reproductive toxicity

no data available

STOT-single exposure

no data available

STOT-repeated exposure

no data available

Aspiration hazard

no data available

12.Ecological information

12.1 Toxicity

  • Toxicity to fish: LC50; Species: Salmo trutta (Brown Trout) yearling; Conditions: freshwater, static, 10°C, pH 7.6-8.0, hardness 210-290 mg/L CaCO3, alkalinity 165-200 mg/L CaCO3, dissolved oxygen >50%; Concentration: 8400 ug/L for 48 hr /formulation
  • Toxicity to daphnia and other aquatic invertebrates: EC50; Species: Daphnia magna (Water Flea) age 4-6 days, length 1.5 mm; Conditions: freshwater, static, 23°C, pH 6-7, dissolved oxygen 5-9 mg/L; Concentration: 10 mmol/cu m for 48 hr (95% confidence interval: 3-40 mmol/cu m) /> or =97% purity/; Effect: Immobilization.
  • Toxicity to algae: EC50; Species: Pseudokirchneriella subcapitata (Green Algae); Conditions: static; Concentration: 12000 ug/L for 14 days; Effect: growth, general /formulation
  • Toxicity to microorganisms: no data available

12.2 Persistence and degradability

AEROBIC: Aerobic aqueous screening test data showed a 84 and 95% loss of 0.1 ppm methylnaphthalenes in 1 and 5.6 days, respectively, for acclimated sewage inoculum; methylnaphthalenes did not degrade with unacclimated sewage(1). No loss of 1-methylnaphthalene was observed for a 5 day BOD test with sewage seed at 20°C(2). When marine water was used as an inoculate, 1- and 2-methylnaphthalene at respective concentrations of 0.045 and 0.067 ppm disappeared within 10 days under aerobic conditions at 25°C(3). Using the Japanese MITI I procedure, <5% degradation of methylnaphthalene occurred in 28 days; for the MITI II test with a freshwater inoculum, 49 and 72% of the 1- and 2-isomers were lost in 28 days under aerobic conditions at 25°C(4). A marine water die-away study with sediment inoculum from Dunstaffnage Bay, Oban, Scotland showed a 92 and 88.5% loss of 1- and 2-methylnaphthalene, respectively, contained in crude oil after 7 days at 20°C(5). Methylnaphthalenes, present at 0.5 ppm carbon, was completely removed within 14 days from acclimated fresh-well water grab samples from Tuffenwies and Zurich, Switzerland, with a pH of 8.0, at 10 and 25°C and microbial populations of 300-400 cells/mL(6). Grab samples of groundwater aquifer soil that had acclimated to creosote wastes containing methylnaphthalene were able to degrade methylnaphthalenes, present at 0.02 to 0.12 ppm, under aerobic conditions at 25°C in less than a week(7). An average loss of 5.6 and 6.5% per week was observed for autoclaved controls(7). Unacclimated material from the same aquifer degraded methylnaphthalenes at an average rate of 3.5% per week; however autoclaved controls lost methylnaphthalenes at an overall rate of about 11% per week(7). Methylnaphthalene, present in light Arabian crude oil, showed little biodegradation in sea water, but when nutrients were added biodegradation increased; with sea water, sediment and nutrients, 100% biodegradation was seen in <10 days(8).

12.3 Bioaccumulative potential

After 2, 3, 5 and 6 weeks exposure, the average bioconcentration factors for 1- and 2-methylnaphthalene in the muscle tissue of Coho salmon (Onchorhynchus kisutch) were 30, 85, 160 and 60, respectively(1). After 2 weeks exposure, the average bioconcentration factor for 1- and 2-methylnaphthalene in the muscle tissue, liver and gills of Starry flounder (Platichthys stellatus) was 420, 1800 and 355, respectively(1). BCFs of 360-810 and 360-620 were found using carp (Cyprinus carpio) which were exposed for 60 days at respective concentrations of 1-methylnaphthalene of 1 and 10 ug/L(2). According to a classification scheme(3), BCF values of <30 are low and >1000 are very high. Methylnaphthalenes may be metabolized by some aquatic organisms(SRC).

12.4 Mobility in soil

Using a structure estimation method based on molecular connectivity indices(1), the Koc of methylnaphthalenes can be estimated to be 2530(SRC). However, 1-methylnaphthalene has reported Koc values of 2290(2) and 4400(3) and 2-methylnaphthalene has a reported Koc value of 4350(2) and measured Koc value of 8500(3). According to a classification scheme(4), these Koc values suggest that methylnaphthalenes are expected to have slight to no mobility in soil.

12.5 Other adverse effects

no data available

13.Disposal considerations

13.1 Disposal methods


The material can be disposed of by removal to a licensed chemical destruction plant or by controlled incineration with flue gas scrubbing. Do not contaminate water, foodstuffs, feed or seed by storage or disposal. Do not discharge to sewer systems.

Contaminated packaging

Containers can be triply rinsed (or equivalent) and offered for recycling or reconditioning. Alternatively, the packaging can be punctured to make it unusable for other purposes and then be disposed of in a sanitary landfill. Controlled incineration with flue gas scrubbing is possible for combustible packaging materials.

14.Transport information

14.1 UN Number

ADR/RID: UN3082 IMDG: UN3082 IATA: UN3082

14.2 UN Proper Shipping Name


14.3 Transport hazard class(es)

ADR/RID: unknown IMDG: unknown IATA: unknown

14.4 Packing group, if applicable


14.5 Environmental hazards

ADR/RID: yes IMDG: yes IATA: yes

14.6 Special precautions for user

no data available

14.7 Transport in bulk according to Annex II of MARPOL 73/78 and the IBC Code

no data available

15.Regulatory information

15.1 Safety, health and environmental regulations specific for the product in question

Chemical name Common names and synonyms CAS number EC number
Methylnaphthalene Methylnaphthalene 1321-94-4 none
European Inventory of Existing Commercial Chemical Substances (EINECS) Listed.
EC Inventory Listed.
United States Toxic Substances Control Act (TSCA) Inventory Listed.
China Catalog of Hazardous chemicals 2015 Not Listed.
New Zealand Inventory of Chemicals (NZIoC) Listed.
Philippines Inventory of Chemicals and Chemical Substances (PICCS) Listed.
Vietnam National Chemical Inventory Not Listed.
Chinese Chemical Inventory of Existing Chemical Substances (China IECSC) Listed.

16.Other information

Information on revision

Creation Date Aug 14, 2017
Revision Date Aug 14, 2017

Abbreviations and acronyms

  • CAS: Chemical Abstracts Service
  • ADR: European Agreement concerning the International Carriage of Dangerous Goods by Road
  • RID: Regulation concerning the International Carriage of Dangerous Goods by Rail
  • IMDG: International Maritime Dangerous Goods
  • IATA: International Air Transportation Association
  • TWA: Time Weighted Average
  • STEL: Short term exposure limit
  • LC50: Lethal Concentration 50%
  • LD50: Lethal Dose 50%
  • EC50: Effective Concentration 50%


  • IPCS - The International Chemical Safety Cards (ICSC), website:
  • HSDB - Hazardous Substances Data Bank, website:
  • IARC - International Agency for Research on Cancer, website:
  • eChemPortal - The Global Portal to Information on Chemical Substances by OECD, website:
  • CAMEO Chemicals, website:
  • ChemIDplus, website:
  • ERG - Emergency Response Guidebook by U.S. Department of Transportation, website:
  • Germany GESTIS-database on hazard substance, website:
  • ECHA - European Chemicals Agency, website:

Disclaimer: The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. We as supplier shall not be held liable for any damage resulting from handling or from contact with the above product.
1H NMR : PredictExpand

NMR Spectrum 1H NMR : Predict

Exposure Route Type of Test Species Observed Dose/Duration Toxic Effects
Administration onto the skin Standard Draize test Rodent - rabbit 500 mg/24H -
Administration into the eye Standard Draize test Rodent - rabbit 500 mg/24H -
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