Skip to Content

Key Documents

View All Documentation

320064

Phthalic anhydride

ACS reagent grade, ≥99%, 99.0-100.2%, flakes

Synonym(s):

1,2-Benzenedicarboxylic anhydride, 1,3-Isobenzofurandione, Phthalic acid anhydride

Sign In to View Organizational & Contract Pricing.

Select a Size

Change View

About This Item

Empirical Formula (Hill Notation):
C8H4O3
CAS Number:
85-44-9
Molecular Weight:
148.12
NACRES:
NA.21
PubChem Substance ID:
24859242
UNSPSC Code:
12352100
EC Number:
201-607-5
MDL number:
MFCD00005918
Beilstein/REAXYS Number:
118515
Assay:
≥99%, 99.0-100.2%
Form:
flakes
Technical Service
Need help? Our team of experienced scientists is here for you.
Let Us Assist

Product Name

Phthalic anhydride, ACS reagent, ≥99%

grade

ACS reagent

Quality Segment

vapor density

5.1 (vs air)

vapor pressure

<0.01 mmHg ( 20 °C)

assay

≥99%, 99.0-100.2%

form

flakes

autoignition temp.

1058 °F

expl. lim.

10.4 %

ign. residue

≤0.01%

bp

284 °C (lit.)

mp

131-134 °C (lit.)

anion traces

chloride (Cl-): ≤0.002%, sulfate (SO42-): ≤0.003%

cation traces

Fe: ≤5 ppm, heavy metals: ≤5 ppm (by ICP)

functional group

anhydride, ester

SMILES string

O=C1OC(=O)c2ccccc12

InChI

1S/C8H4O3/c9-7-5-3-1-2-4-6(5)8(10)11-7/h1-4H

InChI key

LGRFSURHDFAFJT-UHFFFAOYSA-N

General description

Phthalic anhydride is an anhydride of phthalic acid and a key intermediate in the production of plasticizers, dyes, polyesters resins, modifiers for rubber, and polymers.

Application

Phthalic anhydride may be used as a reactant in the preparation of N-substituted phthalimides, poly(isothianaphthene) and methyl (S)-2-phthalimido-4-methylthiobutanoate.

Other Notes

Go to Redi-Dri™Product Listing 797995

Legal Information

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

Still not finding the right product?

Explore all of our products under Phthalic anhydride

Signal Word

Danger

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Resp. Sens. 1 - Skin Irrit. 2 - Skin Sens. 1 - STOT SE 3

Target Organs

Respiratory system

Storage Class

11 - Combustible Solids

WGK

WGK 1

Flash Point (°F)

305.6 °F - DIN 51758

Flash Point (°C)

152 °C - DIN 51758

PPE (personal protective equipment)

dust mask type N95 (US), Eyeshields, Faceshields, Gloves

Choose from one of the most recent versions:

Certificates of Analysis (COA)

Lot/Batch Number

Don't see the Right Version?

If you require a particular version, you can look up a specific certificate by the Lot or Batch number.

Search for a COA

Already Own This Product?

Find documentation for the products that you have recently purchased in the Document Library.

Visit the Document Library