Читать книгу The Rheology Handbook - Thomas Mezger - Страница 166

After mixing the components for 10 minutes, gelation time is determined as the period required to reach a previously defined upper limiting value of the viscosity (termed η2). The following values are specified for three different consistencies (with η1 as the viscosity directly after mixing):

1 for η1 ≤ 250 mPas,then:η2 =1500 mPas

2 for 250 mPas < η1 ≤ 1000 mPas,then:η2 =7500 mPas

3 for η1 > 1000 mPas,then:η2 =15,000 mPas

Comparsion: In ISO 2535 is stated for testing unsaturated polyester resins using a rotating bar: The gelation time is reached at the upper limiting viscosity value of 50 Pas.