By Tom Pawlak — GBI Technical Advisor
I recently broke the leg off an old workshop table. The tabletop was made of particleboard covered with Formica®. The screws holding the leg in place had pulled out and taken chunks of particleboard with them (The problem).
Upon further investigation
I was so encouraged by the results of the repair that we decided to do an experiment to compare the pullout strength of screws in particleboard prior to and after being repaired with G/5. Here are the particulars of the test:
The first pullout — I installed #7 sheet metal screws (0.191″ diameter) in a dry 3/32″ diameter hole in particle board with 11/16″ of thread embedded. Pullout strength averaged 313 lbs. (2 samples)
The holes in the particle board were then repaired with G/5 as described above. Reusing the control’s pulled-out sheet metal screws, I cleaned out loose debris, filled the cavity with G/5, allowed it to cure for 10 minutes, drilled pilot holes into epoxy, and re-installed the screws.
The second pullout — We allowed all this to cure overnight before pulling the screws. Pullout strength averaged 667 lb, more than double the original pullout strength.
We normally recommend WEST SYSTEM® epoxy for fastener installation because it is so strong. But, for many household repairs, G/5 appears to be more than up to the task.