Molekula
Phthalic anhydride
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
Phthalic anhydride is an organic compound widely used in the production of plasticizers, resins, and synthetic lubricants, as well as in dye and pharmaceutical manufacturing. It is a white crystalline powder with a pungent odor, essential for industrial synthesis and polymer applications. Phthalic anhydride has a CAS number of 85-44-9, with the molecular formula C8H4O3 and a molecular weight of 148.12. It is stored at ambient conditions and carries a "Danger" signal word due to its hazardous nature. Molekula supplies phthalic anhydride 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
| Property | Value |
|---|---|
| Appearance | White flake or crystalline powder |
| Melting Point | 129 - 133 ℃ |
| Water | ≤ 0.5% |
| pH | 4.0 - 7.0 |
| Assay | ≥ 98.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Flash Point | 152 °C |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | White, lustrous needles |
| Odour | Mild |
| Melting Point | 131.4 °C |
| Boiling Point | 285.3 °C |
| Vapour Pressure | 5.17 × 10⁻⁴ mmHg at 25 °C |
| log P (octanol/water) | 1.60 |
Source: PubChem CID 6811 (HSDB)
Identification
| Property | Value |
|---|---|
| SKU | 26029436 |
| CAS Number | 85-44-9 |
| IUPAC Name | 2-benzofuran-1,3-dione |
| EC Number | 201-607-5 |
| Molecular Formula | C8H4O3 |
| Molecular Weight | 148.12 |
| Exact Mass | 148.016 |
| SMILES | C1=CC=C2C(=C1)C(=O)OC2=O |
| InChIKey | LGRFSURHDFAFJT-UHFFFAOYSA-N |
| InChI | InChI=1S/C8H4O3/c9-7-5-3-1-2-4-6(5)8(10)11-7/h1-4H |
| PubChem CID | 6811 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29173500 |
| Tariff Code | 2917350000 |
Safety & GHS
-
Corrosive
GHS05
-
Health Hazard
GHS07
-
Serious Health Hazard
GHS08
Hazard statements
- H302 Harmful if swallowed
- H315 Causes skin irritation
- H317 May cause an allergic skin reaction
- H318 Causes serious eye damage
- H332 Harmful if inhaled
- H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled
- H335 May cause respiratory irritation
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
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
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
- 1,3-Dioxophthalan
- 1,3-Isobenzofurandione
- 1,3-Phthalandione
- 2-Benzofuran-1,3-dione
- o-Phthalic acid anhydride
- Phthalandione
- Phthalic acid anhydride
- Retarder AK
- Retarder esen
- Retarder PD
Frequently asked questions
What is phthalic anhydride primarily used for?
Phthalic anhydride is widely used as a precursor in the production of plasticizers (e.g., phthalate esters), resins, dyes, and alkyd resins for coatings and adhesives.
What is the chemical formula and molecular weight of phthalic anhydride?
The chemical formula is **C₈H₄O₃**, and the molecular weight is **148.12 g/mol**.
How should phthalic anhydride be stored?
Store in a cool, dry, well-ventilated area at ambient temperature, away from moisture and incompatible substances.
What grades of phthalic anhydride does Molekula supply?
Molekula supplies **technical/industrial grade** phthalic anhydride, meeting standard purity requirements for manufacturing applications.
Can Molekula supply phthalic anhydride in bulk quantities?
Yes, we offer bulk packaging options (e.g., drums, totes) for large-scale industrial customers—please contact us for specific availability.
What documentation is included with a phthalic anhydride order?
Each order includes a **Certificate of Analysis (CoA)**, Material Safety Data Sheet (MSDS), and a packing slip with batch details.
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.