Phthalic acid CAS 88-99-3

CBNumber: CB6289456

Molecular Formula:C8H6O4

Formula Weight:166.13

Share on facebook
Share on twitter
Share on linkedin
Share on pinterest
Share on whatsapp
Share on email
Product Name: Phthalic acid              CAS Number: 88-99-3          Purity: 99%

Basic Info

Product Name:Phthalic acid
Other Names:1,2-dicarboxybenzene
Place of Origin:Shandong, China
Brand Name:Zhishang Chemical
Type:ACS Grade
Appearance:White powder
EINECS No.:201-873-2
Storage:Cool Dry Place
Provide:Phthalic acid MSDS;
Phthalic acid COA

1,2-dicarboxybenzene;1,2-phthalicacid;Acide phtalique;acidephtalique;acidephtalique(french);

Kyselina ftalova;kyselinaftalova;o-Benzenedicarboxylic acid.

Product Categories:

ACS Grade;Building Blocks;C8;Carbonyl Compounds;

Carboxylic Acids;Chemical Synthesis;Phthalic Acids, Esters and Derivatives;

Aromatics;Miscellaneous Reagents;Essential Chemicals;Inorganic Salts;

Organic Building Blocks;Research Essentials;Solutions and Reagents.

Chemical Properties:

Melting point :210-211 °C (dec.) (lit.)
Boiling point :214.32°C (rough estimate)
density : 1.59 g/cm3 at 15 °C
vapor pressure :7.8 hPa (191 °C)
refractive index :1.5100 (estimate)
Fp :168 °C
storage temp:Store below +30°C.
solubility methanol: 0.1 g/mL, clear
pka 2.89(at 25℃)
form :Powder
color :White
PH:2 (5g/l, H2O, 20℃)
Water Solubility 7 g/L (25 ºC)
Merck :14,7371
BRN :608199
Stability: Stable. Combustible. Incompatible with strong oxidizing agents.
CAS DataBase Reference 88-99-3(CAS DataBase Reference)
NIST Chemistry Reference 1,2-Benzenedicarboxylic acid(88-99-3)
EPA Substance Registry System Phthalic acid (88-99-3)

  1. Organic reagent used to synthesize phthalates.
  2. Phthalic acid is a dibasic acid, with pKa’s of 2.89 and 5.51. The mono potassium salt, potassium hydrogen phthalate is a standard acid in analytical chemistry. Typically phthalate esters are prepared from the widely available phthalic anhydride. Reduction of phthalic acid with sodium amalgam in the presence of water gives the 1,3- cyclohexadiene derivative.
About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Additive , Chemical Auxiliary & Catalyst , Organic Chemicals
  • Products/Service: Organic Intermediate,Inorganic Chemistry, APIs, Dyestuffs And Pigments, Fragrance And Spices, Food Additives
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

Get Phthalic acid Quotation