What term describes the interval from urethane extrusion to final glass placement in the pinch weld?

• A. Curing time
• B. Open time
• C. Working time
• D. Set time

Answer: (C)

Working time is the period after you extrude the urethane during which the adhesive remains workable and you can still spread, adjust, and seat the glass in the pinch weld. This window lets you place the windshield and press it into the proper position before the adhesive begins to set and lose its mobility. Temperature, humidity, and the adhesive formulation all influence how long this window lasts. After this time, the bead starts to skin and cure, making repositioning difficult or impossible.

Curing time refers to the overall hardening process to full strength, set time is when the adhesive becomes firm enough to handle, and open time is the period you can bond before the adhesive begins to skin—these describe different stages from application to full cure, whereas the interval from extrusion to final placement specifically matches the working time.