Open time is confused with pot life
A fictional adhesive product has separate manufacturer-defined pot life and open time under stated conditions. A worker mixes a batch within its pot life, spreads a large area and later places tiles after the spread adhesive has developed a surface skin beyond its specified open time. The worker argues that the batch is still young, so every tile must bond correctly. Another distinguishes the mixed container’s usable period from the adhesive’s exposed working interval. This written exercise mixes no material and supplies no universal duration. It asks which condition was confused, why a fresh-looking ridge is not complete contact evidence and how actual product instructions and suitable checks govern the proposed corrective action.
1. Which intervals were confused?
Read the worked answer
Pot life concerns the mixed material under its specified conditions; open time concerns the exposed spread adhesive before placement. One does not automatically establish the other.
2. What should the assessment use?
Read the worked answer
Use the actual product conditions, evidence of skinning/contact and approved correction requirements rather than assume every tile is acceptable from batch age alone.