... occurs at much lower temperatures together with the release of hydrogen, a viscosity increase and gelation, especially with thin films.In ... presence of suitable catalysts (acids, amines, metals,metallic salts) with hydrogen being released.Particularly strong reactions can take place if only ... (5 g substance, 1 hour at 150 °C, cylindrical crucible, 30 mm diameter, 40 mm high) less than 1.5% residue ...