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4-Hydroxybenzoic acid

ReagentPlus®, ≥99%

Linear Formula:
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level

product line





213-217 °C (lit.)


water: soluble 125 part(lit.)
acetone: soluble(lit.)
alcohol: freely soluble(lit.)
carbon disulfide: insoluble(lit.)
chloroform: slightly soluble(lit.)
diethyl ether: soluble(lit.)

SMILES string




InChI key


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


50 g in poly bottle

Legal Information

ReagentPlus is a registered trademark of Sigma-Aldrich Co. LLC


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Signal Word


Hazard Statements

Precautionary Statements

Hazard Classifications

Eye Dam. 1 - STOT SE 3

Target Organs

Respiratory system

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

  1. 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.

  2. 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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  4. How can Product 240141, 4-Hydroxybenzoic acid, be dissolved?

    According to the chemicals encyclopedia published by the Royal Society of Chemistry, 4-Hydroxybenzoic acid is freely soluble in alcohol, and soluble in about 125 parts water.

  5. 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).

  6. 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.

  7. 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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