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Trioxane molecule
IUPAC name
Other names
s-Trioxane; 1,3,5-Trioxacyclohexane; Trioxymethylene; Metaformaldehyde; Trioxin
110-88-3 YesY
ChEBI CHEBI:38043 YesY
ChemSpider 7790 YesY
Jmol interactive 3D Image
RTECS number YK0350000
Molar mass 90.08 g·mol−1
Appearance White crystalline solid
Density 1.17 g/cm3 (65 °C)[1]
Melting point 62 °C (144 °F; 335 K)[1]
Boiling point 115 °C (239 °F; 388 K)[1]
221 g/L[1]
R-phrases R22
S-phrases S24/25
NFPA 704
Flammability code 2: Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur. Flash point between 38 and 93 °C (100 and 200 °F). E.g., diesel fuel Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point 45 °C (113 °F)[1]
Related compounds
Related compounds

1,2,4-Trioxane Polyoxymethylene

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

1,3,5-Trioxane, sometimes also called trioxane or trioxin, is a chemical compound with molecular formula C3H6O3. It is a white solid with a chloroform-like odor. It is a stable cyclic trimer of formaldehyde, and one of the three trioxane isomers; its molecular backbone consists of a six-membered ring with three carbon atoms alternating with three oxygen atoms. Thus, cyclotrimerization of formaldehyde affords 1,3,5-trioxane:

Trioxane Synthesis V.1.svg

The mechanism can be explained in an acidic catalyzed reaction:



In chemistry, 1,3,5-trioxane is used as a stable, easily handled source of anhydrous formaldehyde. In acidic solutions, it decomposes to generate three molecules of formaldehyde. It may also be used in polymerization to form acetal resins, such as polyoxymethylene plastic. It is a feedstock for certain types of plastic, is an ingredient in some solid fuel tablet formulas, and is used in chemical laboratories as a stable source of formaldehyde.

Trioxane is combined with hexamine and compressed into solid bars to make hexamine fuel tablets, used by the military and outdoorsmen as a cooking fuel.

1,3,5-Trioxane is a mortician's restorative chemical that maintains the corpse's contours after postmortem tissue constriction.[citation needed]

See also[edit]


  1. ^ a b c d e Record in the GESTIS Substance Database of the IFA