SHEET /m/formaldehyde · PubChem CID 712 · CAS 50-00-0 · REV 2026.07
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Formaldehyde from source
CH2O · 30.026 g/mol
formalin · methanal · formol · Formic aldehyde
chemical compound
CategoryEveryday chemistry
Fig. 1 · 2D structure RDKit
C=O
Where you'll find it
Not yet mapped to everyday foods or products.
The dose makes the poison inferred
A reported mouse oral LD50 for Formaldehyde is 42 mg/kg, the dose lethal to half the animals tested. Scaled by body mass alone:
2.9 g
a median lethal dose scaled to 154 lb (2,940 mg)
“The dose makes the poison” is a cross-species estimate shown as neutral science, not a threshold anyone should act on. Real toxicity depends on the person, not body mass alone.
Toxicity & hazards
Toxicity · LD50
42 mg/kg · highly toxic · LD50 mouse oral from source
The dose lens above scales this to a body weight.
6 more reported values
- 100 mg/kgLD50 · oral · rat
- 800 mg/kgLD50 · oral · rat
- 16 mg/kgLD50 · other · mouse
- 87 mg/kgLD50 · iv · rat
- 300 mg/kgLD50 · other · mouse
- 420 mg/kgLD50 · other · rat
DangerFlammableCompressed gasCorrosiveToxicIrritantHealth hazardH220, H227, H280, H301, H302, H311, H314, H315, H317, H318, H319, H330, H331, H334, H341, H350, H351, H370, H372, H401, H402, H412from source