This acetal analog, also known as s-trioxane, presents as a white, characteristic-smelling crystalline powder. It is known to be soluble in ether, alcohols, many organic solvents and water. Store in a cool, dark and well-ventilated place at ambient temperatures. 1,3,5-Trioxane is incompatible with oxidizing agents and should not be stored or handled in their vicinity. This flammable solid may also cause respiratory irritation.