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alpha-Methylstyrene safety data

GHS hazards, precautions, first aid, handling and transport for alpha-Methylstyrene. A classification summary, not a safety data sheet.
CAS 98-83-9Formula C9H10

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

GHS classification

Pictograms, signal word and hazard classes of the GHS classification

GHS02: Flammable
Flammable
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment
Signal word
Warning
211
NFPA 704 rating
health, fire, reactivity

Hazard classes and categories

  • Flam. Liq. 3
  • Eye Irrit. 2
  • STOT SE 3 (respiratory irritation)
  • Aquatic Chronic 2

Hazard statements

H codes grouped by type. Percentages show the share of classification notifications that report the statement

Physical hazards

  • H226Flammable liquid and vapour.

Health hazards

  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.

Environmental hazards

  • H411Toxic to aquatic life with long lasting effects.

Precautionary statements

P codes for prevention, response, storage and disposal

Prevention

  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.

Response

  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P337 + P317If eye irritation persists: Get medical help.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P391Collect spillage.

Storage

  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.

Disposal

  • P501Dispose of contents and container in accordance with local regulations.

First aid

General first aid measures. Get medical advice if you feel unwell

If inhaled
IMMEDIATELY leave the contaminated area, take deep breaths of fresh air. If symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop, call a physician and be prepared to transport the victim to a hospital. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used, if not available, use a level of protection greater than or equal to that advised under Protective Clothing.
Skin contact
IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. IMMEDIATELY call a hospital or poison control center even if no symptoms (such as redness or irritation) develop. IMMEDIATELY transport the victim to a hospital for treatment after washing the affected areas.
Eye contact
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.
If swallowed
DO NOT INDUCE VOMITING. Corrosive chemicals will destroy the membranes of the mouth, throat, and esophagus and, in addition, have a high risk of being aspirated into the victim's lungs during vomiting which increases the medical problems. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. IMMEDIATELY transport the victim to a hospital. If the victim is convulsing or unconscious, do not give anything by mouth, ensure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. Transport the victim IMMEDIATELY to a hospital.

Handling, storage and disposal

Summaries only, follow the supplier SDS for your grade

Safe handling

Fire: NO open flames, NO sparks and NO smoking. Above 54 °C use a closed system, ventilation and explosion-proof electrical equipment.

General: PREVENT GENERATION OF MISTS!

Inhalation: Use ventilation, local exhaust or breathing protection.

Skin: Protective gloves.

Eyes: Wear safety spectacles.

Ingestion: Do not eat, drink, or smoke during work.

Storage

Store only if stabilized. Store in an area without drain or sewer access. Fireproof. Well closed. Separated from strong oxidants.

Exposure limits and toxicity

Occupational exposure limits and toxicity data

OSHA PEL, ceiling
100 ppm (480 mg/m³)
NIOSH REL, TWA
50 ppm
NIOSH REL, STEL
100 ppm
ACGIH TLV, 8-hour TWA
10 ppm
IDLH
700 ppm

Short-term exposure: The substance is irritating to the eyes, skin and respiratory tract. Lachrymation. Long-term exposure: Repeated or prolonged contact with skin may cause dermatitis.

Transport information

UN dangerous goods classification for road, sea and air

UN number
UN 2303
Transport hazard class
3
Packing group
III

Shipping rules depend on mode, quantity and packaging. Confirm the classification with the supplier SDS and your freight forwarder.

Supplier safety data sheets

SDS documents uploaded by suppliers who list this chemical

No supplier has uploaded an SDS for alpha-Methylstyrene yet. Suppliers usually send one with their quote. Request quotes

Safety questions

Quick answers about handling alpha-Methylstyrene safely

Is alpha-Methylstyrene hazardous?

alpha-Methylstyrene carries the GHS signal word "Warning". Main hazards: flammable liquid and vapour, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

Which GHS pictograms apply to alpha-Methylstyrene?

The GHS classification of alpha-Methylstyrene shows 3 pictograms: GHS02 (flammable), GHS07 (harmful or irritant), GHS09 (hazardous to the environment).

What is the UN number of alpha-Methylstyrene?

alpha-Methylstyrene is transported under UN 2303, hazard class 3, packing group III. Check the supplier SDS and the current ADR, IMDG or IATA rules before shipping.

How should alpha-Methylstyrene be stored?

Store only if stabilized. Store in an area without drain or sewer access. Fireproof. Well closed. Separated from strong oxidants.

Where can I get the SDS for alpha-Methylstyrene?

Ask the supplier for the safety data sheet of the exact grade you buy. Suppliers on CompoundList can attach their SDS to listings and send it with a quote. This page is a GHS classification summary, not an SDS.

GHS classification summary, not an SDS. Always check the supplier's SDS. Last updated 7 Oct 2026. Report an error

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