Standard Practice for Polyurethane Raw Materials: Polyurethane Foam Cup Test

Importancia y uso:

5.1 General Utility: 

5.1.1 It is useful to verify catalyst levels in a resin blend or a polyurethane system.

5.1.2 This practice is suitable for research, quality control, specification testing, and process control.

5.2 Limitations: 

5.2.1 Several of the measured parameters are subjective. Therefore, operator-to-operator variability and lab-to-lab variability can be much higher than that of a single operator.

5.2.2 The variability of this practice is dependent on the consistency of mixing of the reactants.

5.2.3 The estimation of precision in this practice is based on typical formulations for rigid and flexible foams. Formulations with faster reaction times will likely have greater variability, particularly cream time (initiation time). Formulations with slower reaction times will likely have greater variability in the measurement of free rise time.

5.2.4 It is possible that low-level (ppm, ppb) ingredient contamination will not be detectable using this practice. Confirmation of such contamination will potentially require large-scale (~20 L) tests and is out of the scope of this practice.

Subcomité:

D20.22

Volúmen:

08.03

Número ICS:

83.080.10 (Thermosetting materials)

Palabras clave:

cream time; cup test; foam testing; formulated polyol; free rise density; free rise height; free rise time; initiation time; isocyanate; polyurethane; pull time; raw material; resin blend; settle back; sigh back; sink back; string gel time; tack free time; top of cup time;