4% Paraformaldehyde (PFA)


Cat. No.: 66311 Category:


Paraformaldehyde (PFA) is a linear polymer, cross-linking fixative that changes to formaldehyde upon heating and by adding small amount of sodium hydroxide. Paraformaldehyde is the polymerization product of formaldehyde; degree of polymerization of 8–100 units. It must be depolymerized to formaldehyde in solution prior to use since it is not the fixative itself. The formaldehyde fixing procedure for cell samples usually involves using a 4% formaldehyde solution in phosphate buffered saline (PBS) on ice for a few minutes. This vital step maintains the cell morphology and therefore ensures that sample cell structures stay intact, and antigens are immobilized, while still permitting antibody-target antigen access.
We supply 4% Paraformaldehyde as a methanol-free, ready-to-use fixative that functions by forming covalent cross-links between molecules. This strong network stabilizes the cellular framework, thus effectively preserving cell and tissue components. The fixative delivers consistency in maintaining the physical and chemical properties of the cell; no evident changes occur in the chemical and morphological characteristics of the cell/tissue specimens on exposure to the product. It is compatible with several antibody-based detection methods, such as immunohistochemistry, immunocytochemistry, and immunofluorescence.
• for use in the preparation of formalin fixatives for tissues or cells when the samples are to be used in florescence imaging
• for fixing of cell/tissue sections during histology/staining procedures
• for cross-linking cells during chromatin immunoprecipitation (ChIP) assay

Molecular Formula: (CH2O)n
Molecular Weight: 30.026 g/mol
CAS No.: 30525-89-4
Synonyms: Formalin, Formic aldehyde, Formol, Methanal, Methyl aldehyde, Methylene oxide, Oxomethane, Oxymethylene, Paraform, Paraformaldehyde
Solubility: Soluble in water
MDL Number: MFCD00133991
Form: Clear Liquid

Additional information


100 mL, 500 mL, 1L

Certificate of Analysis