6.1.1 Adhesive Terminology

6.1.1 Adhesive Terminology

Open time: The maximum allowable time between when the adhesive has been mixed (2Cs), activated or applied (hotmelt) and when the parts can be assembled without compromising the ultimate strength.

Nozzle life or dispense time: The maximum allowable time between the subsequent dispenses of 2C adhesive from the same nozzle or static mixer without causing clogging due to cured or partially-cured adhesive being present.

Static mixer: A precision-engineered dispensing device without internal moving components used for the continuous mixing of 2C adhesives. As the streams move through a static mixer, the series of baffles continuously blend the materials, as can be seen in Figures 147 and 148.

Figure 147 Two components (red and yellow) mixed through a static mixer
Figure 147 Two components (red and yellow) mixed through a static mixer

Static mixers, or ‘static mix nozzles’, are engineered devices that are designed to mix the 2C adhesives correctly; as such, they should not be altered in any way without first validating the performance of the mixed and cured adhesive.

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