5.4.4 Technology-Specific Characteristics

5.4.4 Technology-Specific Characteristics

Each technology, chemistry or product may differ regarding some of the other characteristics that need to be considered while conducting a selection process. Each technology will be covered in depth in Section 6, but many of the general adhesive characteristics are listed below.

Moisture sensitivity: Some adhesives are sensitive to moisture and may need to be stored under special conditions or used within a certain time frame once removed from the protective packaging.

Temperature sensitivity: Particularly with 1C epoxies (heat curing technology), adhesives may need to be frozen to maintain performance and prevent curing. Other technologies may need to be refrigerated to extend shelf life and performance.

Temperature-sensitive viscosity: Many adhesives will become difficult to dispense at lower temperatures due to increased viscosity. Likewise at higher temperatures, the viscosity may decrease enough to cause issues with dispensing and bead placement.

Cure time: Cure time will be affected if the adhesive is a 1C or 2C product. As a general rule, 2C adhesives have shorter cure times than 1C adhesives (with exceptions).

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