Formaldehyde ≥37% in aqueous solution stabilised, GR ACS, Reag. Ph. Eur. analytical reagent, Sigma-Aldrich®

Supplier: Merck
Danger

Synonyms: Paraformaldehyde aqueous solution, Methanal solution, Methylaldehyde solution, Formol, Formaline solution, Formalin, Methylaldehyde

Stabilisation: Stabilised with methanol 10 %
M-Clarity™ quality level = MQ400

1.04003.1000 1.04003.2500 1.04003.9025 1.04003.5000
1.04003.1000EA 45.9 GBP
1.04003.1000 1.04003.2500 1.04003.9025 1.04003.5000
Formaldehyde ≥37% in aqueous solution stabilised, GR ACS, Reag. Ph. Eur. analytical reagent, Sigma-Aldrich®
Formaldehyde

—Formaldehyde (HCOH) is one of the most familiar and effective fixatives. The fixation of the histological specimen material of human or animal origin is commonly performed in a 4% or 10% Formaldehyde solution. Chemically, the 4 % Formaldehyde solution equals a 10 % Formalin solution. The Formaldehyde solution min. 37% is a stock solution that is used for histology and can be diluted with e.g. PBS to 4% ready-to-use fixation solution.

Formula: CH₂O
MW: 30,03 g/mol
Storage Temperature: Ambient
MDL Number: MFCD00003274
CAS Number: 50-00-0
EINECS: 200-001-8
UN: 2209
ADR: 8,III

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Specification Test Results

Assay (acidimetric) 36.5 - 38.0 %
Assay (iodometric) 36.5 - 38.0 %
Identity passes test
Color ≤ 10 Hazen
Appearance of solution passes test
Free acid (as HCOOH) ≤ 0.025 %
Density (20 °C) 1.080 - 1.090 g/ml
Chloride (Cl) ≤ 0.0001 %
Sulfate (SO₄) ≤ 0.002 %
Heavy metals (as Pb) ≤ 0.0002 %
Fe (Iron) ≤ 0.0001 %
Methanol (GC) 9.0 - 11.0 %
Sulfated ash ≤ 0.002 %

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