The 11 and 12-year-olds showed how they mixed glue
, food colouring and borax to create the brightly coloured goo.
A second was mixed glue
and wood failure at the joint line, which produced a mean stress of 2,275 psi.
This value is close to the maximum perpendicular strength typically available with PF mixed glue resulting in the IB wood failure value of 27 percent.
167-inch veneer thickness 2-ply test lap joint samples bonded with isocyanate adhesive increased at a greater initial rate than attained with the PF mixed glue (Figs.
The mixed glue
was then spread on one surface of the bamboo strips with a hand roller.