Bromothymol Blue Sodium Salt


Bromothymol blue (also known as bromothymol sulfone phthalein, and BTB) is a pH indicator for weak acids and bases. It is mostly used in applications that require measuring substances that would have a relatively neutral pH (near 7), such as managing the pH of pools and fish tanks.

  • Biological Dye
  • pH Indicator
  • CO2 Indicator

Dye Content: >95%
Molecular Formula: C27H27Br2NaO5S
Molecular Weight: 646.36
Melting Point: 200-202°C

Hazard Phrases: Not considered harmful under normal laboratory conditions

Cas No: 34722-90-2
Einecs No: 252-169-7

HS CODE: 29147000


Following the UK’s departure from the EU on 1 January 2021, all European shipments are sent on a DAP Basis (Delivered at Place).

This means that the buyer will be liable for import VAT at their prevailing national rate and for orders over 150€ (including carriage) import duties will become chargeable at your prevailing national rate.

The Duty is ascertained by your national customs authority based on the HS Code of each product. The HS Code is shown in the “European Shipment” section of each product page.


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Additional information

Weight N/A
Pack Size

5gm, 10gm, 25gm