4,4'-Biphenol (CAS 92-88-6)
4,4'-Biphenol is a polyphenolic compound consisting of two hydroxyphenyl groups linked by a biphenyl bond, classified under HTS 2907.29.15.00 as a specific other polyphenol. It is a white crystalline solid used primarily as a chemical intermediate in organic synthesis. This pure, chemically defined organic compound falls squarely within Chapter 29 heading for polyphenols.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing impurities exceeding typical commercial standards
Products not meeting 'chemically defined' criteria under Chapter 29 note (a) shift to general 'other' polyphenols in the same subheading.
If imported as technical grade mixture with additives
Mixtures not qualifying as chemically defined organic compounds fall under Chapter 38 for chemical preparations.
If chemically modified with additional functional groups
Derivatives like sulfonated or halogenated versions may classify under different phenol subheadings per Chapter 29 notes on compound derivatives.
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Import Tips & Compliance
• Verify purity and CAS number on Certificate of Analysis to confirm classification as chemically defined compound per Chapter 29 note (a); Provide SDS and impurity levels (<1%) to avoid reclassification; Declare exact chemical name and structure to prevent customs disputes on polyphenol identity
Related Products under HTS 2907.29.15.00
High-Purity 4,4'-Biphenol Flakes
High-purity 4,4'-Biphenol in flake form (>99.5% purity) is a key polyphenol for advanced polymer production, specifically named in HTS 2907.29.15.00. It serves as a monomer in polycarbonate resins and flame retardants. Meets Chapter 29 requirements for separate chemically defined organic compounds without disqualifying impurities.
4,4'-Biphenol Technical Grade Powder
Technical grade 4,4'-Biphenol powder (98-99% purity) is classified under HTS 2907.29.15.00 as the named polyphenol, a chemically defined compound per Chapter 29. Used in antioxidant formulations and liquid crystal production. Minor impurities do not alter its classification as a separate organic compound.
4,4'-Dihydroxybiphenyl Crystals
4,4'-Dihydroxybiphenyl (synonym for 4,4'-Biphenol) in crystalline form is specifically enumerated under HTS 2907.29.15.00 within polyphenols. This chemically defined bis-phenol is essential for epoxy resin hardeners and pharmaceutical intermediates. Fits Chapter 29 scope excluding only listed non-applicable goods.
Stabilized 4,4'-Biphenol for Transport
4,4'-Biphenol with added stabilizer for safe transport, explicitly allowed under HTS 2907.29.15.00 and Chapter 29 note (f). Remains classified as the named polyphenol for general chemical use, not specific applications. Used in high-performance plastics manufacturing.