Molekula
Squaric Acid/3,4-Dihydroxycyclobut-3-ene-1,2-dione
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
Squaric Acid (3,4-Dihydroxycyclobut-3-ene-1,2-dione) is a highly reactive organic compound with a unique four-membered ring structure, primarily used in organic synthesis, polymer chemistry, and as a building block for advanced materials like conductive polymers and liquid crystals. It is also employed in pharmaceutical research for its ability to form stable complexes. This chemical has a CAS number of 2892-51-5, with the molecular formula (HO)2C4(=O)2 and a molecular weight of 114.06 g/mol. It is typically stored at ambient conditions and carries a "Warning" signal word for safety classification. Molekula supplies Squaric 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
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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
Specifications available on request — see Documents below or contact our sales team.
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 190 °C |
| Acidity | Acid |
Identification
| Property | Value |
|---|---|
| SKU | 90028157 |
| CAS Number | 2892-51-5 |
| Molecular Formula | (HO)2C4(=O)2 |
| Molecular Weight | 114.06 |
| SMILES | C1(=C(C(=O)C1=O)O)O |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29144090 |
| Tariff Code | 2914409090 |
Safety & GHS
-
Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H317 May cause an allergic skin reaction
- H319 Causes serious eye irritation
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P303+361 IF ON SKIN (or hair): Remove immediately all contaminated clothing. Rinse with water/shower
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
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
No alternate names recorded for this product.
Frequently asked questions
What is squaric acid (3,4-dihydroxycyclobut-3-ene-1,2-dione) commonly used for?
Squaric acid is primarily used in organic synthesis, including as a building block for dyes, pigments, and pharmaceuticals, as well as in the production of conductive polymers and liquid crystals.
What is the chemical formula and molecular weight of squaric acid?
The chemical formula is **(HO)₂C₄(=O)₂**, and the molecular weight is **114.06 g/mol**.
How should squaric acid be stored?
Store squaric acid at **ambient temperature** in a cool, dry place, away from direct sunlight and incompatible substances.
What grades or purities of squaric acid does Molekula supply?
Molekula supplies squaric acid in **high-purity (98%+) analytical and synthetic grades**—contact us for exact specifications.
Can Molekula supply squaric acid in bulk quantities?
Yes, we offer squaric acid in **bulk quantities**—minimum order quantities and packaging options vary, so please inquire for details.
What documentation comes with a squaric acid order from Molekula?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a product specification sheet.
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.