UN Number: 2215 - CAS Number: 108-31-6

Also known as: ANHYDRIDE MALEIQUE fondu, cis-BUTENEDIOIC ANHYDRIDE, Butenedioic Anhydride, 2,5-Furandione, Toxilic Anhydride, Maleic Anhydride
Information on chemical

Information on chemical

External resources

CAMEO Chemical Database
WISER Substance List


UN number 2215
CAS number 108-31-6
Formula C4H2O3

Physical chemical data

Physical State (20°C) Solid
Physical State (25°C) Solid
Density (kg/m3)
134 [Kg/m³] at a temperature of 20°C
Molar mass (g/mol) 98.06
Density of gas (kg/m3) 4.36
Solubility (g/L)
4912 [g/L] at a temperature of 25°C and salinity of 0‰
Boiling Point (°C) 200
Melting Point (°C) 53
Critical temperature (°C) 721
Critical pressure (Pa) 7280000
Ignition Temperature (°C) 475
Flash Point (°C) 103
Flash Point (Pensky-Martens closed cup) (°C) 102
Flash Point (Cleveland open cup) (°C) 110
Lower explosivity limit (LEL) (volume %) 1.4
Upper explosivity limit (UEL) (volume %) 7.1
Henry's constant (mol/(m³·Pa)) 0.398

Behaviour at sea

Persistence (days) 1.6
Log kow 1.62
Log koc 0
Biodegradation in estuary environment (Half-life) (days) 0.00208
Bioconcentration factor (BCF) 5

Additional data

Colour colourless
Odour choking odour
MARPOL pollution category
Category Description
Y Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a hazard to either marine resources or human health or cause harm to amenities or other legitimate uses of the sea and therefore justify a limitation on the quality and quantity of the discharge into the marine environment.
Standard behavior classification D, FD, F

Transportation data

Transport mode Bulk,Packaged
Package group III
State liquid
Temperature (°C) ambient
Pressure (Pa) ambient

Reactivity data

Water Yes
Acid(s) No
Base(s) No
Metal(s) and alloys No
Static electricity Yes
Oxidizing agents No
Reducing agents No
Combustibles No
Organic substance No

GESAMP Hazard profile

Bioaccumulation in logPow (A1A) 1 - ≥1 and <2
Bioaccumulation (A1) 1 - Very low potential to bioaccumulate
Biodegradation (A2) R - Readily biodegradable
Acute aquatic toxicity (B1) (LC/EC/IC50 (mg/l)) 2 - Slightly toxic
Chronic aquatic toxicity (B2) (NOEC (mg/l)) 0 - Negligible
Acute mammalian toxicity by swallowing (C1) (LD50 (mg/kg)) 1 - Slight
Acute mammalian toxicity by skin penetration (C2) (LD50 (mg/kg)) 2 - Moderate
Acute mammalian toxicity by inhalation (C3) (LC50 (mg/l)) 3 - Moderately high
Skin irritation/corrosivity (D1) 1 - Mildly irritating
Eye irritation/corrosivity (D2) 3 - Severely irritating, with irreversible corneal injury
Interference with coastal amenities (E2) D - Dissolver
Effects on wildlife and bottom habitats (E3) 3 - Is highly acutely toxic; and/or is severely irritant or corrosive to skin or eyes; and/or is carcinogenic, mutagenic or reprotoxic; and/or is a floater or persistent floater with associated health effects

Human toxicity threshold

Corrosive Harmful Health Hazard
Hazard statements
H302 Harmful if swallowed.
H314 Causes severe skin burns and eye damage.
H317 May cause an allergic skin reaction.
H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled.
Precautionary statements
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P284 Wear respiratory protection.
P303 + P361 + P353 IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower.
P305 + P351 + P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P342 + P311 If experiencing respiratory symptoms: Call a POISON CENTER or doctor/physician.
TLV-TWA 0.25
ERPG-1 (ppm) 0.2
ERPG-3 (ppm) 20


Lowest median lethal concentration (LC50) on fishes (mg/l) 230
Highest no observed effect concentration (NOEC) on crustacean (mg/l) 17.5
Highest no observed effect concentration (NOEC) on fishes (mg/l) 150
Assessment factor (AF)
1000 on the Short term
Predicted No Effect Concentration (PNEC) (µg/l)
10 [µg/l] on the Short term
Incident reports

Incident reports

No incident reports available

Emergency Response Guidebook

Emergency Response Guidebook

Guide number: 156

See the guide or download the emergency response guidebook

At sea emergency guide

At sea emergency guide

Emergency schedule: 8-13


Emergency procedures

Spillage on deck

Disconnect source of heat. Allow to solidify, possibly to plug leak. After solid material has cooled down, collect for safe disposal.

Spillage under deck

Adopt action for "On deck".

Fire on deck

Use water spray.

Fire under deck

Batten down; use fixed fire-fighting installation. Otherwise adopt action as for "On deck".

Special equipment to be carried

Protective clothing (gloves, boots, coveralls, headgear).
Self-contained breathing apparatus.
Spray nozzles.
Inert material (e.g. sand).

Remarks by UN no.

Contain molten product, using inert material.

Non-combustible. Use of water on substances may cause violent reaction.

Decision trees

Decision trees

No decision trees available

No additional data

last modified 2023-01-24T21:06:19+00:00

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