BTW, these values are measured with tensile-testing machines, which
are lab equipment. Instron is the best-known brand. They clamp each
end of a test sample and pull on the ends. 'Sounds simple, but they
cost a bundle.

Hmm, I was the startup engineer on Post-IT notepads 30 years ago. We
used and instron to measure the adhesive strength at a target of 80
grams peeling a one inch wide polyester strip off. Instron must have
a WIDE range of load cells.

Karl