Molekula
Phthalic 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
Phthalic acid is a white crystalline organic compound used in the production of plastics, resins, and dyes. It serves as a key intermediate in the synthesis of phthalate esters and other industrial chemicals. It is also used as an analytical and laboratory reagent and as a starting material for phthalimide, phenolphthalein, anthranilic acid and synthetic fragrances. CAS: 88-99-3, Molecular Formula: C6H4(CO2H)2, Molecular Weight: 166.13 g/mol, Storage: Ambient, Signal Word: Danger. Molekula supplies Phthalic 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 — £70.10 per pack ex VAT · £84.12 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 to off white powder |
| Melting Point | 205 - 211°C |
| Heavy Metals (Pb) | ≤ 0.01% |
| Iron (Fe) | ≤ 0.005% |
| Chloridion | ≥ 99.0% |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Acid |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Colorless crystals |
| Melting Point | 205 - 230 °C |
| Density | 1.6 (relative, water = 1) |
| Solubility (other solvents) | Soluble in alcohol; sparingly soluble in ether |
| Vapour Pressure | 6.36 × 10⁻⁷ mmHg at 25 °C |
| pKa | pKa = 2.76 (at 25 °C) |
| log P (octanol/water) | 0.73 |
Source: PubChem CID 1017 (HSDB, Human Metabolome Database (HMDB), ICSC, DrugBank)
Identification
| Property | Value |
|---|---|
| SKU | 38157787 |
| CAS Number | 88-99-3 |
| IUPAC Name | phthalic acid |
| EC Number | 201-873-2 |
| Molecular Formula | C6H4(CO2H)2 |
| Molecular Weight | 166.13 |
| Exact Mass | 166.0266 |
| SMILES | C1=CC=C(C(=C1)C(=O)O)C(=O)O |
| InChIKey | XNGIFLGASWRNHJ-UHFFFAOYSA-N |
| InChI | InChI=1S/C8H6O4/c9-7(10)5-3-1-2-4-6(5)8(11)12/h1-4H,(H,9,10)(H,11,12) |
| PubChem CID | 1017 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29173970 |
| Tariff Code | 2917398590 |
Safety & GHS
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Corrosive
GHS05
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Serious Health Hazard
GHS08
Hazard statements
- H318 Causes serious eye damage
- H340 May cause genetic defects
Precautionary statements
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: 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
- 1,2-benzenedicarboxylic acid
- Acide phtalique
- benzene-1,2-dicarboxylic acid
- hydron;phthalate
- Kyselina ftalova
- o-benzenedicarboxylic acid
- o-dicarboxybenzene
- o-phthalic acid
- ortho-phthalic acid
- Pathalic acid
Frequently asked questions
What is phthalic acid used for?
Phthalic acid is primarily used in the production of plasticizers, resins, and polyester compounds for industrial applications.
What is the chemical formula and molecular weight of phthalic acid?
The formula is C6H4(CO2H)2 with a molecular weight of 166.13 g/mol.
How should phthalic acid be stored?
It should be stored at ambient temperature, away from moisture and incompatible materials.
What grade of phthalic acid does Molekula supply?
Molekula supplies phthalic acid in technical grade; custom grades may be available upon request.
Can Molekula supply phthalic acid in bulk?
Yes, Molekula can supply phthalic acid in bulk quantities; please contact sales for details.
What documentation comes with a phthalic acid order?
Each order includes a Certificate of Analysis (CoA) 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.