
Chemical Composition (Typical Industrial Solution – 37–40% Formalin):
Formaldehyde (CH₂O): 37–40%
Methanol (CH₃OH, Stabilizer): 10–15%
Water: Balance (~50–53%)
Purity & Quality Parameters:
| Parameter | Typical Value | Test Method |
|---|---|---|
| Formaldehyde Content | 37–40% | Titration / HPLC |
| Methanol Content | 10–15% | GC / HPLC |
| Free Acidity (as HCOOH) | ≤ 0.05% | Titration |
| pH (as Is) | 6–8 | pH Meter |
| Color (Pt-Co) | ≤ 10 | Spectrophotometry |
| Non-volatile Matter | ≤ 0.1% | Gravimetric |