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Organic Acids

Tetrachlorophthalic anhydride

CAS: 117-08-8

Overview

Tetrachlorophthalic anhydride (CAS 117-08-8 ), commonly abbreviated as TCPA, is a chlorinated cyclic anhydride used as a reactive flame retardant and chemical intermediate across polymer and coating systems.

Unlike additive flame retardants, it bonds directly into polymer backbones, delivering durable fire resistance without migration losses. In epoxy resin formulations for printed circuit boards, TCPA acts as a curing agent.

It simultaneously imparts halogenated flame retardancy to the cured matrix. Polyester and alkyd resin producers incorporate it as a monomer to build fire-retardant properties into coatings used in construction panels.

Industrial textiles and paper treatment processes use TCPA-derived intermediates to meet flame resistance standards required in packaging and protective fabrics. It also functions as a plasticizer precursor in PVC compounding.

Its chlorine content contributes to both flexibility and reduced flammability in finished profiles and films. Tetrachlorophthalic anhydride is supplied as an off-white to pale yellow crystalline powder for industrial use.

Technical grade is the standard commercial specification, with purity levels typically at 98% or higher. Bulk quantities are available in fiber drums or multi-wall bags suited for industrial procurement volumes.

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Physical Properties

Melting Point255-256.5 °C
Boiling Point371 °C
Density1.49
Flash Point362°C
Appearancewhite needle-like crystals or powder
ColorWhite to off-white
FormFlakes
Water Solubility0.8 mg/L (21 ºC)
Vapor Pressure0.16 mm Hg ( 145 °C)
Log P3.2 at 25℃

Safety & Handling

Danger GHS05 GHS08 GHS09 GHS07 Hazard Statements H317 May cause an allergic skin reaction H318 Causes serious eye damage H320 Causes eye irritation H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled H372 Causes damage to organs through prolonged or repeated exposure H400 Very toxic to aquatic life H410 Very toxic to aquatic life with long lasting effects Precautionary Statements P233 Keep container tightly closed. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P272 Contaminated work clothing should not be allowed out of the workplace. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P284 In case of inadequate ventilation wear respiratory protection. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P391 Collect spillage. P403 Store in a well-ventilated place. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P333+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P342+P316 Get emergency medical help immediately. P362+P364 Take off contaminated clothing and wash it before reuse. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code29173990
UN Number3077
ADR Class9
Packing GroupIII
Storage Class6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects
WGK (Germany)2

Other Names

Tetrathal | etrachlorophthalic acid anhydride | 4567-Tetrachloro-13-isobenzofurandione | 13-Dioxy-4567-tetrachloroisobenzofuran | Niagathal | 13-Isobenzofurandione4567-tetrachloro- | 4567-Tetrachloro-2-benzofuran-13-dione | Phthalic anhydridetetrachloro- | TCPA

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Chemical Properties

CAS Number
117-08-8
EC Number
204-171-4
Mol. Weight
285.9
HS Code
29173990

Industries

Documentation