Molekula
Maleic acid
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Maleic acid is a dicarboxylic acid used in polymer synthesis, pharmaceuticals, and as a crosslinking agent. It appears as a white crystalline powder and is soluble in water and ethanol. CAS: 110-16-7, molecular formula: HO₂CCH=CHCO₂H, molecular weight: 116.0722 g/mol. Store at ambient temperature. Signal word: Warning. Molekula supplies Maleic acid from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 kg — £35.50 per pack ex VAT · £42.60 inc. VAT
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5 kg — £133.00 per pack ex VAT · £159.60 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | White granules or crystalline powder |
| Water | ≤ 2.0% |
| Heavy metals | ≤ 10ppm |
| Fumaric acid | ≤ 1.5% |
| Identification | BP Standard |
| Solubility | Soluble in water |
| Assay | 99.0 to 101.0% |
| Sulphated Ash | ≤ 0.1% |
| Appearance of Solution | Colourless liquid |
| Iron (Fe) | ≤ 5ppm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Transport Class | 8 |
| Packing Group | III |
| Acidity | Acid |
For research use only. Not for human use.
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless crystals |
| Odour | Faint acidulous odor |
| Melting Point | 130.5 °C |
| Boiling Point | 135 °C at 760 mmHg (decomposes) |
| Density | 1.59 (relative, water = 1) |
| Vapour Pressure | 0.0048 Pa at 25 °C |
| pKa | pKa = 1.83 |
| log P (octanol/water) | -0.48 |
Source: PubChem CID 444266 (HSDB, DrugBank, CAMEO Chemicals, ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 37286853 |
| CAS Number | 110-16-7 |
| IUPAC Name | (Z)-but-2-enedioic acid |
| EC Number | 203-742-5 |
| Molecular Formula | HO2CCH=CHCO2H |
| Molecular Weight | 116.0722 |
| Exact Mass | 116.011 |
| SMILES | C(=C\C(=O)O)\C(=O)O |
| InChIKey | VZCYOOQTPOCHFL-UPHRSURJSA-N |
| InChI | InChI=1S/C4H4O4/c5-3(6)1-2-4(7)8/h1-2H,(H,5,6)(H,7,8)/b2-1- |
| PubChem CID | 444266 |
| UN Number | UN3261 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| Tariff Code | 2917198055 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
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Serious Health Hazard
GHS08
Hazard statements
- H302+312 Harmful if swallowed or in contact with skin
- H314 (sub cat. 1C) Causes severe skin burns and eye damage
- H317 May cause an allergic skin reaction
- H335 May cause respiratory irritation
- H373 May cause damage to organs through prolonged or repeated exposure
- H402 Harmful to aquatic life
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P301+310 IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P333+313 IF skin irritation or a rash occurs: Get medical advice/attention
- P337+313 If eye irritation persists get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- (2Z)-but-2-enedioic acid
- (Z)-2-Butenedioic acid
- (Z)-Butenedioic acid
- 2-Butenedioic acid (2Z)-
- 2-Butenedioic acid (Z)-
- cis-1,2-Ethylenedicarboxylic acid
- cis-butenedioic acid
- Maleinic acid
- Malenic acid
- Toxilic acid
Frequently asked questions
What is maleic acid used for?
Maleic acid is commonly used in the production of resins, coatings, and polymers, as well as in pharmaceuticals and as a starting material for producing fumaric acid by isomerization.
What is the chemical formula and molecular weight of maleic acid?
The formula is HO2CCH=CHCO2H and the molecular weight is 116.0722 g/mol.
How should maleic acid be stored?
Maleic acid should be stored at ambient temperature, protected from moisture and heat.
What grade of maleic acid does Molekula supply?
Molekula supplies maleic acid in technical grade; custom grades are available upon request.
Can Molekula supply maleic acid in bulk?
Yes, Molekula can supply maleic acid in bulk quantities; please contact us for pricing and availability.
What documentation comes with a maleic acid order?
Each order includes a Certificate of Analysis and Safety Data Sheet (SDS) with the shipment.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.