Formaldehyde ≥37% in aqueous solution stabilised, GR ACS, Reag. Ph. Eur. analytical reagent, Sigma-Aldrich®
Supplier: Merck
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Danger
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Synonyms:
Paraformaldehyde aqueous solution, Methanal solution, Methylaldehyde solution, Formol, Formaline solution, Formalin, Methylaldehyde
Stabilisation:
Stabilised with methanol 10 %
M-Clarity™ quality level = MQ400
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 |
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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