Phenol Red CAS 143-74-8

Phenol Red, also known as Phenol Red, is a deep red crystalline powder, molecular weight 354.38, CAS No. 143- 74-8, soluble in water, alcohol, acetone, almost insoluble in ether and chloroform.It is soluble in alkali hydroxide or carbonic acid alkali solution with deep red colour, stable in air, and can be used as identification medium for microbial culture, acid-base indicator, blood carbon dioxide measurement, and indicator for the preparation of disaccharide-iron urea medium for bacterial serological test.

Availability:



Inquire

Model:
143-74-8
Brand:
Futurechemical
Code:
143-74-8

Product Description

Phenol Red Basic information
Product Name:	Phenol Red
CAS:	143-74-8
MF:	C19H14O5S
MW:	354.38
EINECS:	205-609-7
Mol File:	143-74-8.mol
Phenol Red Chemical Properties
Melting point	>300 °C
Boiling point	>300°C
bulk density	200-300kg/m3
density	1.445 Mg m-3
refractive index	1.5300 (estimate)
Fp	>300°C
storage temp.	no restrictions.
solubility	1 M NaOH: soluble1mg/mL
pka	7.9(at 25℃)
form	Solid
color	Red
Odor	Odorless
PH	6.8～8.4
PH Range	6.6(YELLOW)-8.0(RED)
Water Solubility	0.77 g/L
ε(extinction coefficient)	≥10000 at 288-294nm in H2O
	≥55000 at 555-561nm in H2O
	≥7000 at 357-363nm in H2O
λmax	557nm, 558nm, 360nm, 423nm, 433nm
Merck	147,247
BRN	326470
Major Application	Display device, sol-gel matrix, photoreceptors, fuel cells, waveguides, paints, detergents, cosmetics, antiperspirant composition, diapers, screening bacteria, detecting viable cells, diagnosis of urogenital ureaplasmosis, treatment of pathogen infections, amyloid-associated diseases, glaucoma, pulmonary hypertension, asthma, chronic obstructive pulmonary disease, erectile dysfunction, Raynaud’s syndrome, heparin overdose, vulvodynia, wound healing, psychoactive drugs, evaluating dental caries activity
InChIKey	BELBBZDIHDAJOR-UHFFFAOYSA-N
LogP	3.02
CAS DataBase Reference	143-74-8(CAS DataBase Reference)
EPA Substance Registry System	Phenol Red (143-74-8)

Name (content and impurity content %)	index	result
PH color change domain	1.2 (orange)-3.0 (yellow) 6.5 (brown)-8.0 (purple)	1.2 (orange)-3.0 (yellow) 6.5 (brown)-8.0 (purple)
Maximum absorption wavelength (nm)
λ1 (PH1.2)	503-506	503
λ2 (PH3.0)	430-435	435
λ3 (PH6.5)	430-435	430
λ4 (PH8.0)	557-560	558
Mass Absorption Index (L/cm g)
α1 (λ1, PH1.2, dry sample)	110-123	112.5
α2 (λ2, PH3.0, dry sample)	60-68	63.2
α3 (λ3, PH6.5, dry sample)	62-72	65.5
α4 (λ4, PH8.0, dry sample)	115-130	115.0
Alkali dissolution test	qualified	qualified
loss on drying	1.0	0.5
Ignition residue (as sulfate)	0.2	0.2

Phenol Red CAS 143-74-8 C19H14O5S pH indicator Water quality testing agent

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.

Send the water analysis, the system type and the operating conditions. Our sales team replies with the product selection, dosing recommendation and commercial details.

Request a Quote