Phosphate-Buffered 4% Paraformaldehyde

This filtered and ready-to-use tissue fixative is freshly made from high purity paraformaldehyde powder. This solution may be stored at room temperature for at least one year without change of the original quality. The standard solution contains 4% paraformaldehyde in 0.1 M phosphate buffer (pH 7.4). Other concentrations can also be provided upon request.