Appendices 1-18 to: Report on the Health Effects of Selected Pesticide Coformulants

Appendix 4: Hexamethylenetetramine
24 General description

Molecular formula: C₆H₁₂N₄

Structural formula:

Molecular weight: 140.19

CAS-no.: 100-97-0

Synonyms: Ammonioformaldehyde

Formamine

Hexamethyleneamine

Hexamine

Hexilmethylenamine

HMT

HMTA

Methenamine

1,3,5,7-Tetraazaadamantane

1,3,5,7-Tetraazatricyclo(3.3.1.1(3,7))decane

Description: Hexamethylenetetramine occurs as hygroscopic and colourless crystals or as a white crystalline powder with no or mild ammonia odour.

Melting point: Sublimates at about 263°C without melting and with partial decomposition to mainly formaldehyde and ammonia.

Boiling point: Sublimates.

Density: 1.27 g/ml (at 25°C).

Vapour pressure: 0.004 mmHg (0.53 Pa) (at 25°C).

Concentration of
saturated vapours: 5.3 ppm (calculated) at 25°C and 760 mmHg.

Conversion factor: 1 ppm = 5.83 mg/m³ 20°C

1 mg/m³ = 0.17 ppm 1 atm

Solubility: Water: 449 g/l (at 12°C).

References: ChemFinder (2001), CIR (1992), Dreyfors et al. (1989), HSDB (2000), ICSC (1993), Loeper & Berzins (1995), Merck Index (1996).