reagent grade, crystalline

Linear Formula:
CAS Number:
Molecular Weight:
30.03 (as monomer)
MDL number:
PubChem Substance ID:

Quality Level


reagent grade

vapor density

1.03 (vs air)

vapor pressure

<1.45 mmHg ( 25 °C)



autoignition temp.

572 °F

expl. lim.

73 %


120-170 °C (lit.)


0.88 g/mL at 25 °C (lit.)

storage temp.




InChI key


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General description

Paraformaldehyde is a cross-linking fixative. It is changed to formaldehyde by heating and by adding small amount of sodium hydroxide.


Paraformaldehyde is recommended for use in the preparation of formalin fixatives for tissues or cells when the samples are to be used in florescence studies.
Paraformaldehyde has been used for fixing of cells and tissue sections during staining procedures.


500 g in poly bottle
1 kg in poly bottle
5 kg in poly drum

Signal Word


Target Organs

Respiratory system

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


UN 2213 4.1 / PGIII

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

Certificate of Origin

  1. What is the difference between formaldehyde and paraformaldehyde?

    Paraformaldehyde is the polymeric form of formaldehyde. Paraformaldehyde is a solid, and formaldehyde is a gas. Formaldehyde solutions consist of formaldehyde gas dissolved in a solvent of some kind.

  2. What is the shelf life of Product P6148, Paraformaldehyde?

    The shelf life has not been assigned but guarantee of quality is 1 year from the time of receipt for unopened bottles stored at 2-8 °C.  We expect the product to be of good quality for at least 2 years.

  3. How does Product P6148, Paraformaldehyde, compare to prilled paraformaldehyde, Product 441244?

    Prilled has the appearance of small white beads.  Product P6148 is a powder, not prilled.

  4. How stable are Product P6148, Paraformaldehyde, solutions?

    Buffered solutions of 2-4% can be stored protected from light for 2-3 weeks at 2-8°C.

  5. How to prepare solutions of Product P6148, Paraformaldehyde?

    Paraformaldehyde does not dissolve but rather can be depolymerized in solution. Depolymerized solutions can be prepared in water with heating to 55-60°C. If necessary, further addition of 1-2 drops of a sodium hydroxide solution may be required. Some protocols suggest that paraformaldehyde should be prepared in buffered solutions such as phosphate buffer or PBS at approximately pH 7.

  6. 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.

  7. 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.

  8. What is the difference between formaldehyde and paraformaldehyde?

    Paraformaldehyde is the polymeric form of formaldehyde. It is a solid. Formaldehyde is a gas which when dissolved in water gives a formaldehyde solution. Commercially available formaldehyde solutions usually contain 10-15% methanol, which prevents the formaldehyde from forming the polymeric paraformaldehyde.

  9. How do I find price and availability?

    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 or view local office numbers.

  10. 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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