2,5-Diphenyloxazole (PPO)
2,5-Diphenyloxazole is a fluorescent organic compound classified under HTS 2934.99.08.00 as an aromatic heterocyclic compound containing an oxazole ring with phenyl substituents. It is primarily used as a primary scintillator in liquid scintillation cocktails for detecting beta radiation in radiochemical analysis.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported primarily as fluorescent brightening agent for commercial textile applications
Synthetic organic products used as fluorescent brightening agents fall under Chapter 32 rather than Chapter 29 heterocyclic compounds.
If when pre-dissolved in scintillation solvent as ready-to-use cocktail
Mixtures for laboratory use containing the compound as minor component classified as diagnostic reagents, not pure compounds.
If sold in aromatic ether formulations exceeding 50% concentration
Aromatic ethers with different functional priority may take precedence over heterocyclic classification per chapter notes.
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Import Tips & Compliance
• Provide Safety Data Sheet (SDS) and Certificate of Analysis confirming 99%+ purity as required for research chemicals
• Include end-use statement specifying scintillation/radiochemical applications to avoid misclassification as general dye
• Ensure proper UN-approved packaging for flammable solids (UN3345) with hazard class 4.1 labeling
Related Products under HTS 2934.99.08.00
2,5-Diphenyloxazole Scintillation Grade
High-purity 2,5-Diphenyloxazole (PPO) specifically refined for nuclear spectroscopy applications, classified under HTS 2934.99.08.00. This aromatic oxazole derivative exhibits optimal fluorescence quantum yield when dissolved in toluene or pseudocumene scintillators. Used in environmental monitoring and medical isotope research.
PPO (2,5-Diphenyloxazole) Research Chemical
Laboratory-grade 2,5-Diphenyloxazole imported for organic synthesis and fluorescence studies under HTS 2934.99.08.00. This compound serves as wavelength shifter in multi-component scintillator systems and precursor for custom fluorophores. Packaged in amber glass for light-sensitive applications.
2,5-Diphenyloxazole NMR Standard
Certified reference material of 2,5-Diphenyloxazole at 98% purity with NIST-traceable NMR spectrum, classified HTS 2934.99.08.00. Used for calibrating 1H and 13C NMR spectrometers in pharmaceutical QC labs. Provides characteristic aromatic proton signals at 7.9-8.1 ppm.
High-Purity PPO for Plastic Scintillators
Ultra-pure 2,5-Diphenyloxazole (PPO) dissolved at 2% in polystyrene for extruded plastic scintillator sheets, under HTS 2934.99.08.00 when imported as pure active ingredient. Essential for high-energy physics detectors and security screening systems. Provides 360nm emission peak matching PMT sensitivity.