甲醇

vapor density

1.11 (vs air)

vapor pressure

410 mmHg ( 50 °C), 97.68 mmHg ( 20 °C)

assay

≥99.9% (GC)

autoignition temp.

725 °F

shelf life

limited shelf life, expiry date on the label

technique(s)

HPLC: suitable

impurities

≤0.001% free acid (as HCOOH), ≤0.03% water, ≤1 ppb quinine fluor., 254 nm, ≤1 ppb quinine fluor., 365 nm

evapn. residue

≤0.0005%

transmittance

210 nm, ≥30%, 220 nm, ≥50%, 235 nm, ≥80%, 260 nm, ≥98%

mp

−98 °C (lit.)

solvent strength ε (Al₂O₃)

0.95 (Lit.)

λ

1 cm path, H₂O reference

UV absorption

λ: 210 nm A_max: 0.53, λ: 220 nm A_max: 0.31, λ: 235 nm A_max: 0.10, λ: 260 nm A_max: 0.01