Maleic Acid

1. Identification

Product Identifiers

Product Name

Maleic Acid

Other Names

N/A

Product Number(s)

C152

CAS Number

110-16-7

Recommended use of the chemical and restriction on use

Company Details

Emergency Contact Details

2. Hazards Identification

Classification of the substance or mixture

Label Elements

Signal Words

Warning

Hazard Statement(s)

• H302 ± H312 Harmful if swallowed or in contact with skin.
• H314 Causes severe skin burns and eye damage.
• H317 May cause an allergic skin reaction.
• H335 May cause respiratory irritation.

Precautionary Statement(s)

• Prevention
• P260 Do not breathe dust.
• P264 Wash skin thoroughly after handling.
• P280 Wear protective gloves/ protective clothing/ eye protection/ face protection.
• Response
• P301 ± P330 ± P331 IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
• P303 ± P361 ± P353 IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water.
• P304 ± P340 ± P310 IF INHALED: Remove person to fresh air and keep comfortable for breathing. Immediately call a POISON CENTER/ doctor.
• P305 ± P351 ± P338 ± P310 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Immediately call a POISON CENTER/ doctor.
• P333 ± P313 If skin irritation or rash occurs: Get medical advice/ attention.
• P362 ± P364 Take off contaminated clothing and wash it before reuse.
• Storage
• P403 ± P233 Store in a well-ventilated place. Keep container tightly closed.

Primary route(s) of entry

Human Health

Inhalation

• Supply fresh air and to be sure call for a doctor.
• In case of unconsciousness place patient stably in side position for transportation.

Ingestion

• Rinse mouth. Do NOT induce vomiting.
• Immediately call a doctor.

Eyes

Rinse opened eye for several minutes under running water. If symptoms persist, consult a doctor.

Skin

Take off immediately all contaminated clothing.Immediately wash with water and soap and rinse thoroughly.

Environment

3. Composition / Information on Ingredients

4. First Aid Measures

Ingestion

• After swallowing: make victim drink water (two glasses at most), avoid vomiting (risk of
• perforation). Call a physician immediately. Do not attempt to neutralise.

Inhalation

• Supply fresh air and to be sure call for a doctor.
• In case of unconsciousness place patient stably in side position for transportation.

Skin Contact

In case of skin contact: Take off immediately all contaminated clothing. Rinse skin with water/ shower. Call a physician immediately.

Eye Contact

Rinse opened eye for several minutes under running water. If symptoms persist, consult a doctor.

Other Information

Symptoms of poisoning may even occur after several hours; therefore medical observation for at least 48 hours after the accident.

5. Firefighting Measures

Suitable extinguishing equipment

Fire

CO₂, extinguishing powder or water spray. Fight larger fires with water spray or alcohol resistant foam.

HAZCHEM

• Carbon oxides
• Combustible.
• Development of hazardous combustion gases or vapours possible in the event of fire.

Special protective equipment and precautions for fire fighters

6. Accidental Release Measures

Personal precautions, protective equipment and emergency procedures

• Advice for non-emergency personnel: Avoid inhalation of dusts. Avoid substance contact.
• Ensure adequate ventilation. Evacuate the danger area, observe emergency procedures,
• consult an expert.

Environmental precautions

Do not allow to enter sewers/ surface or ground water.

Methods and materials for containment and clean up

• Dispose contaminated material as waste according to item 13.
• Ensure adequate ventilation.

7. Handling and Storage

Precautions for safe handling

Work under hood. Do not inhale substance/mixture.

Conditions for safe storage

• Keep receptacle tightly sealed.
• Cover drains. Collect, bind, and pump off spills. Observe possible material restrictions (see sections 7 and 10). Take up dry. Dispose of properly. Clean up affected area. Avoid generation of dusts.

8. Exposure Controls / Personal Protection

Exposure Standards

Engineering controls

Contains no substances with occupational exposure limit values.

Personal protective equipment

Eye and face protection

• Avoid contact with the eyes. Use equipment for eye protection tested and approved under appropriate government standards.
• Tightly sealed goggles.

Skin protection

• Avoid contact with the skin. Protective gloves.
• This recommendation applies only to the product stated in the safety data sheet, supplied by us and for the designated use. When dissolving in or mixing with other substances and under conditions deviating from those stated in EN 16523-1 please contact the supplier of CE-approved gloves (e.g. KCL GmbH, D-36124 Eichenzell,
• Internet: www.kcl.de).
• Full contact
• Material: Nitrile rubber
• Minimum layer thickness: 0.11 mm
• Break through time: 480 min
• Material tested:KCL 741 Dermatril® L

Body protection

• Acid-resistant protective clothing
• Immediately remove all soiled and contaminated clothing.
• Wash hands before breaks and at the end of work.

Respiratory protection

In case of brief exposure or low pollution use respiratory filter device. In case of intensive or longer exposure use self-contained respiratory protective device.

9. Physical and Chemical Properties

General information

Appearance

white powder Solid

Odour

slightly sourish

pH

Not applicable.

Vapour Pressure

Not applicable.

Density

1.59 g/cm³

Boiling Point

160 °C

Melting Point

144 - 145 °C

Solubility

Miscibility with Water at 20 °C 788 g/l

Specific Gravity of Density

Not determined.

Flash Point

Not applicable.

Flammable (Explosive) Limits

Product is not flammable.

Ignition Temperature

Not determined.

Formula

HOOC-CH=CH-COOH, (C-H-O?)

10. Stability and Reactivity

Reactivity

No further relevant information available.

Chemical stability

Not available.

Possibility of hazardous reactions

No dangerous reactions known.

Conditions to avoid

No further relevant information available.

Incompatible materials

No further relevant information available.

11. Toxicological Information

Acute effects

Symptoms of poisoning may even occur after several hours; therefore medical observation for at least 48 hours after the accident.

Eye contact

Irritating effect.

Skin contact

Irritant to skin and mucous membranes.

Ingestion

• LD/LC50 values relevant for classification:
• Oral LD50 708 mg/kg (rat)
• Dermal LD50 1560 mg/kg (rabbit)

Inhalation

No further relevant information available.

Toxicity and irritation

No further relevant information available.

12. Ecological Information

Ecotoxicity

No further relevant information available.

Persistence and degradability

No further relevant information available.

Bioaccumulative potential

No further relevant information available.

Other adverse effects

Water hazard class 1 (German Regulation) (Assessment by list): slightly hazardous for water Do not allow undiluted product or large quantities of it to reach ground water, water course or sewage system.

13. Disposal Considerations

General information

14. Transport Information

ADG label required

HAZCHEM

• Carbon oxides
• Combustible.
• Development of hazardous combustion gases or vapours possible in the event of fire.

UN Number

UN1759

Proper shipping name

1759 CORROSIVE SOLID, N.O.S. (MALEIC ACID)

Transport hazard class

8

Packing group

PG III

Environmental hazard

No

Special precautions for users

Warning: Corrosive substances.

Additional information

• 5 kg
• Excepted quantities (EQ)
• Code: E1
• Maximum net quantity per inner packaging: 30 g
• Maximum net quantity per outer packaging: 1000 g ·
• Transport category 3

15. Regulatory Information

Poisons Schedule Number

Substance is not listed.

Other Information

No further relevant information available.

16. Other Information

SDS preparation date

26 March 2026

Comments

• Abbreviations and acronyms:
• ADR: Accord relatif au transport international des marchandises dangereuses par route (European Agreement Concerning the International
• Carriage of Dangerous Goods by Road)
• IMDG: International Maritime Code for Dangerous Goods
• DOT: US Department of Transportation
• IATA: International Air Transport Association
• EINECS: European Inventory of Existing Commercial Chemical Substances
• CAS: Chemical Abstracts Service (division of the American Chemical Society)
• NFPA: National Fire Protection Association (USA)
• HMIS: Hazardous Materials Identification System (USA)
• LC50: Lethal concentration, 50 percent
• LD50: Lethal dose, 50 percent
• PBT: Persistent, Bioaccumulative and Toxic
• vPvB: very Persistent and very Bioaccumulative
• NIOSH: National Institute for Occupational Safety
• OSHA: Occupational Safety Health
• TLV: Threshold Limit Value
• PEL: Permissible Exposure Limit
• REL: Recommended Exposure Limit
• Acute toxicity - oral 4: Acute toxicity - Category 4
• Skin irritation 2: Skin corrosion/irritation - Category 2
• Eye irritation 2A: Serious eye damage/eye irritation - Category 2A
• Sensitization - skin 1: Skin sensitisation - Category 1
• Specific target organ toxicity (single exposure) 3: Specific target organ toxicity (single exposure) - Category 3

References

• EMS SDS "MALEIC ACID" 05/05/2025 https://www.emsdiasum.com/docs/technical/msds/18150.pdf
• Sigma-Aldrich SDS "Maleic Acid, electronic grade, >=99.97% trace metal basis, water <=350 ppm" 25.06.2026 https://www.sigmaaldrich.com/AU/en/sds/aldrich/912735-userType=anonymous