Tetrachlorophthalic Anhydride (TCPA), CAS 117-08-8, is also known as perchlorophthalic anhydride. It is a chlorinated cyclic anhydride used as a reactive intermediate in polymer flame-retardant synthesis and as a precursor for phthalocyanine dyes and pigments. Confirm the anhydride assay or content, impurity limits, packaging and documentation needs before ordering.
Tetrachlorophthalic Anhydride CAS 117-08-8
- CAS: 117-08-8
- Synonyms: TCPA; 1,3-Isobenzofurandione, 4,5,6,7-tetrachloro-; Tetrachlorophthalic acid anhydride; Perchlorophthalic anhydride
- Einecs: 204-171-4
- Molecular Formula: C₈Cl₄O₃
- Grade: Specify anhydride assay, moisture, colour and impurity limits for the required grade; confirm against the current offer.
- Package: Confirm available drum or other packaging, liner, net weight and moisture protection for the current offer.
Product Description
Tetrachlorophthalic anhydride (TCPA), CAS 117-08-8, EC 204-171-4.
Molecular formula: C₈Cl₄O₃; molecular weight: 285.88.
Identity: A chlorinated phthalic anhydride. Confirm the anhydride form; it is not tetrachlorophthalic acid.
Reference appearance and physical data: White to off-white crystalline material; reported melting range is around 254–258 °C. Confirm the offered grade and test method rather than treating this reference range as a lot specification.
Application: An intermediate for selected pigments, dyes and resins. State the intended process and impurity requirements in the RFQ.
Buyer specification: Agree anhydride assay, moisture or hydrolysis level, acid value, colour, insoluble matter and relevant chlorinated impurities. Include free chlorine, iron or HCB limits only where the application requires them; verify numerical limits against the actual sourced grade.
Packaging: Request the available drum or other packaging, liner, net weight and moisture protection for the current offer.
Documents: State the required COA/TDS/SDS, quantity and destination. Check the quoted product and lot documents before ordering.
FAQ - Technical & Supply Chain
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Q:
Are Tetrachlorophthalic Anhydride and Tetrachloro Phthalic Anhydride the same substance?
A: Yes. Both spellings refer to CAS 117-08-8, formula C8Cl4O3. It is a chlorinated phthalic anhydride and is not phthalic anhydride or tetrachlorophthalic acid. State the CAS number and anhydride form in the purchase specification. -
Q:
What is Tetrachlorophthalic Anhydride used for?
A: Tetrachlorophthalic anhydride is used as an intermediate for selected pigments and dyes and in certain flame-retardant resin systems. In an RFQ, state the target process and limits for colour-affecting impurities, because requirements differ by application. -
Q:
Which specifications matter when purchasing Tetrachlorophthalic Anhydride?
A: Confirm anhydride assay or content, water or hydrolysis level, acid value, melting-point range and test method, colour, insoluble matter and relevant chlorinated impurities. Set limits for free chlorine, iron, alkali-insoluble matter or HCB only where the application requires them, and verify the limits against the offered grade. -
Q:
What packaging and moisture controls are required?
A: The packaging should protect this anhydride from moisture. Confirm the actual offered container, liner, net weight, seal condition and destination requirements; do not assume a fixed drum size before a source is quoted. Use the current SDS and supplier storage instructions because water contact can hydrolyze the anhydride. -
Q:
What appearance, melting point and solubility should be expected for TCPA?
A: TCPA CAS 117-08-8 is normally a white to almost-white crystalline powder or needles, with a melting range commonly around 254-258 C and a boiling point near 371 C. It is soluble in dioxane, has very low water solubility around 0.8 mg/L at 21 C, and can hydrolyze to tetrachlorophthalic acid in hot water.
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