If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf
1.07241
Phenol red
pH indicator, ACS
Synonym(s):
Phenol red
Select a Size
| Size/SKU | Availability | Price |
|---|---|---|
5 g | Check Cart for Availability | $139.00 |
25 g | Check Cart for Availability | $350.00 |
100 g | Check Cart for Availability | $1,230.00 |
1 kg | Check Cart for Availability | $8,710.00 |
About This Item
Product Name
Phenol red, indicator ACS
grade
ACS reagent
Quality Segment
form
solid
loss
≤1% loss on drying, 110°C
visual transition interval
1.2-3.0, brown-orange to yellow(1st transition range), 6.5-8.0, brownish-yellow to red-violet(2nd transition range)
mp
>300 °C
bulk density
200‑300 kg/m3
storage temp.
2-30°C
SMILES string
[S]1(=O)(=O)OC(c4c1cccc4)(c3ccc(cc3)O)c2ccc(cc2)O
InChI
1S/C19H14O5S/c20-15-9-5-13(6-10-15)19(14-7-11-16(21)12-8-14)17-3-1-2-4-18(17)25(22,23)24-19/h1-12,20-21H
InChI key
BELBBZDIHDAJOR-UHFFFAOYSA-N
General description
Application
- Dye in the preparation of phenol red/n-Si photodiode [phenol red/n-type silicon wafer] by spin coating technique. The device is appropriate for photo-detection applications.
- Color-changing dye in the design of fiber optic pH sensor because as the acidity increases, the dye′s absorption properties shift from the green to the blue section of the spectrum.
- Indicator in the determination of freshwater pH.
Features and Benefits
- pH is 6.4 or below yellow color
- pH is 8.2 or above red color.
Analysis Note
1st transition range: pH 1.2 - pH 3.0brownish orange - yellow
2nd transition range: pH 6.5 - pH 8.0brownish yellow - red violet
Loss on drying (110 °C): ≤ 1
Transition range (according to ACS): passes test
ACS conforms
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Flash Point (°F)
Not applicable
Flash Point (°C)
Not applicable
Signal Word
Danger
Hazard Codes
Precautionary Statements
Hazard Classifications
Acute Tox. 1 Oral - Eye Irrit. 2
Storage Class
6.1A - Combustible acute toxic Cat. 1 and 2 / very toxic hazardous materials
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How can I determine the shelf life / expiration / retest date of this product?
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How is shipping temperature determined? And how is it related to the product storage temperature?
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Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf
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