Chemical Name Dehydroacetic Acid
Synonyms DHA, 3‑Acetyl‑6‑methyl‑2H‑pyran‑2,4 (3H)‑dione, Dehydroacetic acid
CAS Number 520‑45‑6
EC Number 208‑293‑9
Molecular Formula C8H8O4
Molecular Weight 168.15 g/mol
HS‑Code29322000
2. Chem‑Physical Properties
Appearance White to off‑white crystalline fine powder
Odor Almost odorless
Melting point 109‑113 °C
Boiling point 270 °C @760 mmHg
Flash point 157 °CBulk density ~0.70 g/cm³
Solubility in water ~0.5‑2 g/L @25 °C (sparingly soluble)
Solubility Soluble in ethanol, acetone, benzene, ether; soluble in alkaline aqueous solutionpH (2 g/L water) ~4.0
Stability Stable under normal conditions; incompatible with strong oxidizers & strong bases; sublimates upon heating
Hygroscopicity Non‑hygroscopic
3. Quality Specification (Food / Cosmetic Grade)
| Test Item | Unit | Specification | Typical Result | Test Method |
|---|---|---|---|---|
| Appearance | — | White crystalline powder | Complies | Visual |
| Assay (acid‑base titration) | % | ≥98.0 | 99.2 | Titration |
| Melting range | °C | 109‑113 | 110‑112 | Capillary |
| Loss on drying | % | ≤1.0 | 0.35 | Oven‑dry |
| Residue on ignition | % | ≤0.20 | 0.07 | Gravimetric |
| Heavy metals (as Pb) | ppm | ≤10 | <5 | AAS |
| Arsenic (As) | ppm | ≤2 | <1 | AAS |
4. Application & Use
Cosmetic preservative: broad‑spectrum antibacterial‑antifungal agent for skin‑care & hair‑care formulations; often combined with sodium dehydroacetate.
Food preservative: mould‑inhibitor for pickles, bakery, pastries; more commonly used as sodium dehydroacetate salt in food industry.
Pharmaceutical intermediate, biocide for coating & adhesive systems.
Organic synthesis raw material, metal complexing agent.
Note: Poor water solubility; better water performance achieved by converting to sodium dehydroacetate.
5. Packing
Standard packing: 25 kg fiber drum with inner PE bag
Small lab package: 1 kg / 5 kg plastic bottle / aluminium‑plastic bag
6. Storage & Transportation
Storage
Store in cool, dry, well‑ventilated warehouse, temperature 10‑30 °C. Keep tightly closed.
Keep away from strong oxidizing agents and strong alkali.
Shelf‑life: 24 months under recommended storage.Transportation
Non‑dangerous goods for international transport
Proper Shipping Name: Dehydroacetic Acid
Prevent moisture and package breakage during transit.
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