Phenol red
Also known as: Phenolsulfonphthalein, PSP, PR, Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis-, Sulfonaphthal, 3,3-Bis(p-hydroxyphenyl)-3H-2,1-benzoxathiole 1,1-dioxide, α-Hydroxy-α,α-bis(p-hydroxyphenyl)-o-toluenesulfonic acid γ-sultone
Phenol red (CAS 143-74-8) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C19H14O5S and a molecular weight of 354.376 g/mol. Key properties include a melting point of 300 °C, a boiling point of 562.8±50.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 294.2±30.1 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation, H319 — Causes serious eye irritation and H335 — May cause respiratory irritation. It is listed by 1 supplier; request a quote for pricing. Record last updated Aug 21, 2026.
- CAS No.
- 143-74-8
- Jingsj CID
- J-38266-5
- Molecular Formula
- C19H14O5S
- Molecular Weight
- 354.376 g/mol
- Category
- Alcohols
- Last updated
- 8/21/2026
| Supplier | Purity / Pack | Base Price | Unit Price | Origin | |
|---|---|---|---|---|---|
Made to Order | - | - | CN China |
Physicochemical Properties
| Melting Point | 300 °C |
|---|---|
| Boiling Point | 562.8±50.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 294.2±30.1 °C |
| Exact Mass | 354.056183 |
| PSA | 92.21000 |
| LogP | 3.02 |
| Vapor Pressure | 0.0±1.6 mmHg at 25°C |
| Refractive Index | 1.697 |
| Additional Property | 0.77 g/L |
GHS Safety & Compliance
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
Activity & Biological Data
| Additional Information | [1]. Morgan A, et al. Caution for the routine use of phenol red - It is more than just a pH indicator. Chem Biol Interact. 2019;310:108739. [2]. Peltzer D, et al. Rapid and simple colorimetric loop-mediated isothermal amplification (LAMP) assay for the detection of Bovine alphaherpesvirus 1. J Virol Methods. 2021;289:114041. |
|---|
Customs & Trade Information
| HS Code | 2934991000 |
|---|---|
| Summary | 2934991000. sultones and sultams. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0% |
Frequently Asked Questions
What is the CAS number of Phenol red?
The CAS number of Phenol red is 143-74-8.
What are the molecular formula and molecular weight of Phenol red?
Phenol red has molecular formula C19H14O5S and molecular weight 354.376 g/mol.
Which suppliers offer Phenol red?
1 supplier(s) listed; request a quote for pricing.
Is Phenol red hazardous?
Phenol red has GHS signal word Warning and hazard statements H315 — Causes skin irritation; H319 — Causes serious eye irritation; H335 — May cause respiratory irritation.
What are the upstream and downstream products of Phenol red?
For Phenol red, Upstream Products: Saccharin, Phenol, 2-Sulfobenzoic anhydride; Downstream Products: Bromophenol Red, Bromophenol Blue, 4,4'-Dihydroxybenzophenone.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Phenol red (CAS 143-74-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-38266-5 (accessed 2026-11-06).
Data for reference only; verify product details with suppliers before purchase.