Terephthalic acid

Description

Terephthalic acid · CAS 100-21-0 · C8H6O4. UNII 6S7NKZ40BQ. Melting Point: 427 °C (sealed tube); Melting Point: > 300 °C; Flash Point: 260 °C.

Identification

CAS Registry Number	100-21-0
PubChem CID	7489
Molecular formula	C8H6O4
IUPAC name	terephthalic acid
UNII (FDA)	6S7NKZ40BQ

Computed Descriptors

Molecular Weight	166.13
XLogP3	2
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	4
Rotatable Bond Count	2
Exact Mass	166.02660867
Monoisotopic Mass	166.02660867
Topological Polar Surface Area	74.6
Heavy Atom Count	12
Formal Charge	0

Physical & Chemical Properties

Melting Point	427 °C (sealed tube)
Melting Point	> 300 °C
Flash Point	260 °C
Flash Point	500 °F (260 °C) (Open cup)
Solubility	In water, 15 mg/L at 20 °C
Solubility	0.015 mg/mL at 20 °C
Density	1.51
Density	1.51 @25 °C
Vapor Pressure	0.0000092 [mmHg]
LogP	log Kow = 2.00

Physical description & handling notes

• Terephthalic acid is a white powder. (NTP, 1992)
• Liquid; Dry Powder; Other Solid; Dry Powder; Large Crystals; CBI
• White solid; [Hawley] Odorless or a slight acetic acid odor; [CHEMINFO] Off-white powder; [MSDSonline]
• Solid
• WHITE CRYSTALLINE POWDER.
• White powder

Regulatory Status

Regulatory & Food Contact	FDA Cumulative Estimated Daily Intake (CEDI): FCS FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS
GHS notification summary	82.5% (1040 / 1260)

GHS Hazard Classification

GHS notification summary	82.5% (1040 / 1260)
Reported hazard statements	H315 (17.4%), H319 (17.1%), H335 (15.1%), H320, H372, H302, H316, H361

Documented Uses

• Used in wool processing and making plastic films and sheets; Also added to poultry feeds and to certain antibiotics to increase their effectiveness; [HSDB]
• Textiles (Fiber & Fabric Manufacturing) [Category: Industry]
• Farming (Feed Additives) [Category: Industry]
• Terephthalic acid /is/ ... used almost exclusively to produce saturated polyesters.
• Production of linear, crystalline polyester resins, fibers, and films by combination with glycols; reagent for alkali in wool; additive to poultry feeds.
• Forms polyesters with glycols which are made into plastic films & sheets; /used/ in analytical chemistry.

Synonyms

TEREPHTHALIC ACID; 100-21-0; p-Phthalic acid; 1,4-Benzenedicarboxylic acid; benzene-1,4-dicarboxylic acid; p-Dicarboxybenzene; 1,4-dicarboxybenzene; Acide terephtalique; p-Benzenedicarboxylic acid; p-Carboxybenzoic acid; Tephthol; para-Phthalic acid; Kyselina tereftalova; 4-Carboxybenzoic Acid; TA-33MP; WR 16262

Frequently Asked Questions

What are the CAS number and molecular formula of Terephthalic acid?

CAS 100-21-0; molecular formula C8H6O4; molecular weight — g/mol.

What other names is Terephthalic acid known by?

TEREPHTHALIC ACID, 100-21-0, p-Phthalic acid, 1,4-Benzenedicarboxylic acid, benzene-1,4-dicarboxylic acid, p-Dicarboxybenzene.

What is the regulatory status of Terephthalic acid?

Documented regulatory listings: FDA Cumulative Estimated Daily Intake (CEDI): FCS; FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS.

Is Terephthalic acid classified as hazardous?

82.5% of GHS notifications report no hazard classification (1040 of 1260).

What are the key physical properties of Terephthalic acid?

Melting Point: 427 °C (sealed tube); Melting Point: > 300 °C; Flash Point: 260 °C; Flash Point: 500 °F (260 °C) (Open cup).

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.