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1.04003

Sigma-Aldrich

Formaldehyde solution about 37%

GR for analysis stabilized with about 10% methanol ACS,Reag. Ph Eur

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Synonym(s):
Formaldehyde solution, Formaline solution, Methanal solution, Methylaldehyde solution, Formalin
Linear Formula:
HCHO
CAS Number:
50-00-0
Molecular Weight:
30.03
Beilstein:
1209228
MDL number:
MFCD00003274
UNSPSC Code:
12352114
NACRES:
NA.21

grade

ACS reagent

Quality Level

400

Agency

reag. Ph. Eur.

vapor density

1.03 (vs air)

vapor pressure

52 mmHg ( 37 °C)

form

liquid

autoignition temp.

300 °C (Formaldehyde)
572 °F

expl. lim.

7-73 % (v/v) Formaldehyde)

concentration

36.5-38.0% (iodometric, acidimetric)

pH

2.8-4.0 (20 °C in H2O)

bp

93-96 °C/1013 hPa

mp

<-15 °C

transition temp

flash point 62 °C (Formaldehyde)

density

1.09 g/cm3 at 20 °C
1.09 g/mL at 25 °C (lit.)

application(s)

diagnostic assay manufacturing
hematology
histology

storage temp.

15-25°C

SMILES string

[H]C([H])=O

InChI

1S/CH2O/c1-2/h1H2

InChI key

WSFSSNUMVMOOMR-UHFFFAOYSA-N

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General description

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.

Analysis Note

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 %

Signal Word

Danger

Hazard Classifications

Acute Tox. 2 Inhalation - Acute Tox. 3 Dermal - Acute Tox. 3 Oral - Carc. 1B - Eye Dam. 1 - Muta. 2 - Skin Corr. 1B - Skin Sens. 1 - STOT SE 1 - STOT SE 3

Target Organs

Eyes,Central nervous system, Respiratory system

WGK

WGK 3

Flash Point(F)

closed cup

Flash Point(C)

closed cup

Regulatory Information

危险化学品

Certificates of Analysis (COA)

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Protocols

Analytical Method: Analytical Quality Assurance, Standard for Formaldehyde

Preparation of a standard solution for Formaldehyde

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