Bromocresol Purple 115-40-2

Slightly yellow rose colored crystalline powder. Insoluble in water, yellow in ethanol, purple red in dilute sodium hydroxide and dilute sodium carbonate solutions, melting point 241-242 ℃. Application: Acid base indicator, color changes from light yellow to purple red, with a pH range of 5.2-6.8.

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Model:
115-40-2
Brand:
futurechemical
Code:
115-40-2

Product Description

Bromocresol Purple Basic information
Product Name:	Bromocresol Purple
CAS:	115-40-2
MF:	C21H16Br2O5S
MW:	540.22
EINECS:	204-087-8
Mol File:	115-40-2.mol
Bromocresol Purple Chemical Properties
Melting point	240 °C (dec.) (lit.)
bulk density	515kg/m3
density	1.6509 (estimate)
Fp	36 °C
storage temp.	Store at +5°C to +30°C.
solubility	ethanol: soluble1mg/mL
pka	6.21, 6.3, 6.4(at 25℃)
form	Solid
Boiling point	590.2±50.0 °C(Predicted)
color	Purplish-brown
PH	pH : 5.2～6.8
PH Range	5.2(yellow)-6.8(purple)
Water Solubility	practically insoluble
ε(extinction coefficient)	≥22000 at 418-424nm in methanol
λmax	419nm, 433nm, 591nm
Merck	141,387
BRN	359618
Stability:	Stable. Incompatible with strong oxidizing agents.
Major Application	Waveguides, fuel cells, sensors, sol-gel technology, display device, falsification-proof security paper, paints, detergents, identifying fresh and stale rice, detecting lactic acid bacteria, dental materials, vaginal infection test method
InChIKey	ABIUHPWEYMSGSR-UHFFFAOYSA-N
CAS DataBase Reference	115-40-2(CAS DataBase Reference)
EPA Substance Registry System	Bromcresol Purple (115-40-2)

Bromocresol Purple C21H16Br2O5S 115-40-2 pH indicator Analytical reagent

Quality Assurance

Full-Process Quality Control: From incoming raw material inspection to in-process monitoring and final outgoing checks, every batch is inspected at each production stage against strict acceptance standards.
Third-Party Certified & Tested: Our quality management system is certified to ISO 9001, and products are regularly tested by accredited laboratories (e.g. SGS, TÜV). Test reports are available on request.
100% Batch Traceability: Each batch carries a unique lot number that links raw material records, production parameters, and test results, enabling complete traceability from factory to final delivery.
Pre-Shipment Inspection: Every order passes a final pre-shipment inspection, with inspection photos and reports shared before dispatch.

FAQ From Customers

Q1: What is the minimum order quantity?

A: There is no quantity limit for the first sample or trial order. Just tell us the actual quantity you need.
Q2: How can I confirm that the quality meets the requirements?

A: Provide your specifications, and our technical team will check them or customize them for you; we can provide TDS, MSDS, and COA, and accept third-party testing.
Q3: How do you ensure stable quality?

A: We manufacture under an ISO 9001 quality system, test every batch before release, and retain samples for 24 months for traceability.
Q4: Do you provide samples?

A: Yes — Free samples are available; freight is at buyer's expense for express delivery.