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240141 Sigma-Aldrich

4-Hydroxybenzoic acid

ReagentPlus®, ≥99%

  • CAS Number 99-96-7

  • Linear Formula HOC6H4CO2H

  • Molecular Weight 138.12

  •  Beilstein/REAXYS Number 970950

  •  EC Number 202-804-9

  •  MDL number MFCD00002547

  •  PubChem Substance ID 24854406

  •  NACRES NA.22



Related Categories Allium cepa (Onion), Allium sativum (Garlic), Armoracia rusticana (Horseradish), Aspalathus linearis (Rooibos tea), Building Blocks,
grade   ReagentPlus®
assay   ≥99%
mp   213-217 °C (lit.)
solubility   water: soluble 125 part(lit.)
  acetone: soluble(lit.)
  alcohol: freely soluble(lit.)
  carbon disulfide: insoluble(lit.)
  chloroform: slightly soluble(lit.)
  diethyl ether: soluble(lit.)



4-Hydroxybenzoic acid was used in the synthesis of 4-hydroxybenzaldoxime, via one-pot chemoenzymatic method.


50 g in poly bottle

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Signal word 
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NONH for all modes of transport
WGK Germany 


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Frequently Asked Questions

Which document(s) contains shelf-life or expiration date information for a given product?
If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.
How do I get lot-specific information or a Certificate of Analysis?
The lot specific COA document can be found by entering the lot number above under the "Documents" section.
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There are several ways to find pricing and availability for our products.Once you log onto our website, you will find the price and availability displayed on the product detail page.You can contact any of our Customer Sales and Service offices to receive a quote. USA customers: 1-800-325-3010 orview local office numbers.
How can Product 240141, 4-Hydroxybenzoic acid, be dissolved?
According to the Merck Index, 4-Hydroxybenzoic acid is freely soluble in alcohol, and soluble in about 125 parts water.
What is the shelf life of Product 240141, 4-Hydroxybenzoic acid?
This information can be found on the product specification sheet for a related product (H20059).
I see that Product 240141, 4-Hydroxybenzoic acid, is deleted. Which product do you offer in its place?
Our best offer item is Product No. H20059.
What is the Department of Transportation shipping information for this product?
Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product.
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