Product Details
Maleic anhydride is a cyclic anhydride derived from maleic acid, featuring a unique five-membered ring molecular framework that delivers outstanding chemical reactivity.
- Melting Point: 52.8 °C (pure industrial grade range: 52–53°C)
- Boiling Point: 202 °C at standard atmospheric pressure
- Relative Density: 1.480 (solid state, 20 °C); 1.314 (liquid state, 60 °C)
- Vapor Pressure: 0.16 mmHg at 20 °C (moderately volatile under ambient temperature; sublimation accelerates above 80°C)
- Flash Point (Closed Cup): 103 °C; Autoignition Temperature: 447 °C
- Flammable Explosion Limit: 1.4% ~ 7.1% (volume fraction in air)
- Solubility: Freely soluble in acetone, ethanol, ether, benzene and most conventional organic solvents; rapidly undergoes hydrolysis reaction upon contact with water to generate maleic acid; insoluble in aliphatic petroleum ethers
- Chemical Stability: Maintains stable properties under cool, dry, sealed normal storage conditions. It is chemically incompatible with strong bases, strong oxidants, primary amines and alcohols, and will readily trigger addition reactions, cross-linking or uncontrolled polymerization when mixed with these substances. Long-term storage at temperatures above 300°C will cause thermal decomposition into carbon monoxide and carbon dioxide.
- Recommended Storage Conditions: Store in ventilated, low-temperature dry warehouses; segregate away from oxidizing agents, alkaline raw materials and amine chemicals
Maleic anhydride Chemical Properties
| Item | Value |
| Melting point | 51-56 °C lit. |
| Boiling point | 200 °C lit. |
| bulk density | 700-800kg/m3 |
| density | 1.48 |
| vapor density | 3.4 vs air |
| vapor pressure | 0.16 mm Hg 20 °C |
| refractive index | 1.4688 estimate |
| Fp | 218 °F |
| storage temp. | Store below +30°C. |
| solubility | Chloroform Slightly Ethyl Acetate Slightly |
| form | powder |
| pka | 0 at 20 ℃ |
| color | White |
| Odor | Mild acrid odor. |
| PH | 0.8 550g/l H2O 20℃ Hydrolysis |
| explosive limit | 1.4-7.1% V |
| Water Solubility | 79 g/100 mL 25 ºC |
| Sensitive | Moisture Sensitive |
| Merck | 14,5704 |
| BRN | 106909 |
| Henry's Law Constant | atm m3/mol Not applicable reacts with water |
| Exposure limits | NIOSH REL TWA 1 ppm 0.25 mg/m3 IDLH 10 ppm OSHA PEL TWA 0.25 ppm ACGIH TLV TWA 0.25 ppm with an intended change of 0.1 ppm. |
| Dielectric constant | 51.0 60℃ |
| Stability | Stable Combustible Incompatible with water strong oxidizing agents alkali metals strong bases amines most common metals polymerization catalysts and accelerators. |
| Cosmetics Ingredients Functions | FILM FORMING |
| InChI | 1S/C4H2O3/c5-3-1-2-4 6 7-3/h1-2H |
| InChIKey | FPYJFEHAWHCUMM-UHFFFAOYSA-N |
| SMILES | O=C1OC O C=C1 |
| LogP | -2.61 at 20℃ |
| CAS DataBase Reference | 108-31-6 CAS DataBase Reference |
| NIST Chemistry Reference | 2,5-Furandione 108-31-6 |
| EPA Substance Registry System | Maleic anhydride 108-31-6 |
Safety Information
| Item | Value |
| Hazard Codes | C |
| Risk Statements | 22-34-42/43 |
| Safety Statements | 22-26-36/37/39-45 |
| RIDADR | UN 2215 8 PG 3 |
| OEB | C |
| OEL | TWA 1 mg/m3 0.25 ppm |
| WGK Germany | 1 |
| RTECS | ON3675000 |
| F | 21 |
| Autoignition Temperature | 870 °F |
| TSCA | TSCA listed |
| HS Code | 2917 14 00 |
| HazardClass | 8 |
| PackingGroup | III |
| Storage Class | 6.1D Non-combustible acute toxic Cat.3 toxic hazardous materials or hazardous materials causing chronic effects |
| Hazard Classifications | Acute Tox 4 Oral Eye Dam 1 Resp Sens 1 Skin Corr 1B Skin Sens 1A STOT RE 1 Inhalation |
| Hazardous Substances Data | 108-31-6 Hazardous Substances Data |
| Toxicity | LD50 orally in Rabbit 1090 mg/kg LD50 dermal Rabbit 2620 mg/kg |
| IDLA | 10 mg/m3 |
Product Application Of Maleic anhydride CAS#108-31-6
The molecular structure of maleic anhydride contains two highly active carbon-carbon double bond reactive sites, granting it exceptional reaction activity and versatile functional performance across organic synthesis and mass industrial manufacturing. It ranks as one of the most fundamental, high-value bulk organic chemical intermediates and raw materials, widely deployed across global industrial sectors supported by our one-stop chemical supply service at hlhschem.com.
Organic Synthesis & Fine Chemical Manufacturing
It serves as a classic high-efficiency dienophile reagent for Diels-Alder cycloaddition reactions, acting as an irreplaceable core intermediate for the production of various fine chemicals, surfactants, water treatment agents and scale inhibitors.
Agrochemical Industry
Applied as the key synthesis feedstock for multiple agricultural products, including maleic hydrazide plant growth retardants, malathion organophosphorus insecticides, and a wide range of crop protection regulators and herbicide intermediates.
Pharmaceutical & Dyestuff Production
Functions as an essential building block intermediate for the synthesis of pharmaceutical active ingredients, veterinary drug raw materials, acid dyes, reactive dyes and color fixative auxiliaries.
Resin, Polymer & Coatings Industry
It is the primary raw material for manufacturing mainstream thermosetting resin products and participates in diversified copolymerization processes:
- Unsaturated polyester resins and medium-oil alkyd resins for architectural coatings, automotive paints and anti-corrosion coatings
- Environment-friendly plasticizers, water-based adhesives and polymer modification additives
- Cross-linking agents to significantly boost the mechanical tensile strength, outdoor weather resistance, thermal stability and processing fluidity of finished plastic, coating and composite polymer products
Fast delivery time
Inventory 2-3 working days New production 7-10 working days
FAQ
FAQ 1: Can I request test samples of Maleic Anhydride, and what is your minimum order rule?
Yes, we provide free lab test samples for all global buyers to verify product quality before bulk orders. Our formal bulk MOQ is 1 full container load (FCL). As an integrated manufacturing and trading enterprise operating through https://www.hlhschem.com, we can also offer flexible small-batch trial orders for new clients upon negotiation, supported by our self-owned factory stock and complete warehousing logistics system to guarantee fast sample delivery within 3–7 working days.
FAQ 2: What quality certifications and inspection documents can you provide for Maleic Anhydride export shipment?
Our factory holds complete ISO quality management system certification, and every batch of maleic anhydride undergoes strict laboratory testing before delivery. We can supply full supporting export documents including COA (Certificate of Analysis), SDS (Safety Data Sheet), commercial invoice, packing list, customs declaration forms and hazardous goods transportation certification. Our in-house quality control lab tracks all core physical and chemical indicators (purity, melting point, impurity content, moisture) to ensure consistent product compliance with international industrial standards, matching the full-range quality control system introduced on our official website hlhschem.com.
