Hi Thomas - by 3 tests I think they mean a sample set ie 3 of the same test piece. This is for statistical coverage. So ask them do they mean 3 identical samples or 3 different materials.... Statistically material tests typically use 5 samples and for some of the work I do they require 6 samples so the reliability is greater. Follow up the other sources before you jump. Peter

Here's some numbers from a laminate test. I get 6 because it costs the same as 5 at the lab I use then the results are more useful with a particular design code...