Which term is used to describe the overall duration from extrusion to final placement in bonding processes?

• A. Curing period
• B. Drying time
• C. Initial set
• D. Working time

Answer: (D)

The main idea is how long you can work with the adhesive after it’s extruded before it starts to set. This window is the working time—the period during which you can spread, position, and adjust the bonded parts and still make changes. In auto glass bonding, you must place the glass and achieve the final position within this time, before the adhesive loses its workability and starts to harden. After that, curing begins and the adhesive continues to harden toward full strength.

The other terms describe different stages: curing period is the complete hardening phase after placement; drying time refers to solvent evaporation; initial set is the moment the adhesive begins to gel but isn’t fully cured yet. So the term that best fits the duration from extrusion to final placement is working time.