Urotropine

Urotropine ;
Names:	urotropine; hexamine; methenamine; hexamethylenetetramine; formin; aminoform; HMTA; 1,3,5,7-tetraazaadamantane; food additive Е239;
Formula:	(CH2)6N4;
Molar mass:	140.189 g/mol;
Density:	1.27 g/cm3;
Crystal system:	cubic; a=0.702 Å, b=0.702 Å, c=0.702 Åα=90°, β=90°, γ=90°;
Shapes:	https://en.crystalls.info/w/uploads/media/a/a8/Rhombic_dodecahedron.json Rhombic dodecahedron ;
Color:	colorless;
Melting point:	263 °C536.15 K <br />505.4 °F <br />965.07 °R <br />;
Decomposition point:	280 °C553.15 K <br />536 °F <br />995.67 °R <br />;
Stability:	stable

Description

Organic compound, polycyclic amine Doesn't form water hydrates.

Where to buy

Can be bought in hiking and travel shops (as "heat tab") and pharmacy (as "Hexamethylenetetramine" antiseptic).

Influence of impurities

In water solutions may form adducts with other compounds. Adduct crystals have different shapes and don't dehydrate as much.

Notes

Large solubility in water makes crystal growing quite hard, especially using slow evaporation method - a thick crust is rapidly formed, blocking the evaporation process.

Solubility

TableGraph

Temperature	g/`100,00` g water	g/`100,00` g ethanol 90%	g/`100,00` g ethanol	g/`100,00` g methanol	g/`100,00` g acetone	g/`100,00` g diethyl ether	g/`100,00` g glycerol	g/`100,00` g xylol	g/`100,00` g benzene	g/`100,00` g carbon disulfide	g/`100,00` g ammonia	g/`100,00` g amyl alcohol	g/`100,00` g trichloromethane	g/`100,00` g chloroform
12°C285.15 K <br />53.6 °F <br />513.27 °R <br />	`81.32`													`8.09`
20°C293.15 K <br />68 °F <br />527.67 °R <br />	`167`	`5.58`	`2.89`	`9.18`	`0.82`	`0.08`	`20.5`	`0.14`	`0.23`	`0.13`	`1.3`	`2.26`	`0.53`	`13.4`

Insoluble in petroleum ether.

Gallery

UrotropinDmitry Shintyakov, VKontakteDmitry ShintyakovVKontakte

Sources

Amines
Urotropine (C₆H₁₂N₄)

Urotropine
Names:	urotropine hexamine methenamine hexamethylenetetramine formin aminoform HMTA 1,3,5,7-tetraazaadamantane food additive Е239
Formula:	(CH₂)₆N₄
Molar mass:	140.189 g/mol
Density:	1.27 g/cm³
Crystal system:	cubic a=0.702 Å, b=0.702 Å, c=0.702 Åα=90°, β=90°, γ=90°
Shapes:	Rhombic dodecahedron
Color:	colorless
Melting point:	263 °C536.15 K <br />505.4 °F <br />965.07 °R <br />
Decomposition point:	280 °C553.15 K <br />536 °F <br />995.67 °R <br />
Stability:	stable