Answer by David Carlisle for strange warning when using newtxmath and siunitx...
If you use fix-cm (or the older type1cm) package latex will know that cm fonts are scalable these days and scale to the requested size.
View Articlestrange warning when using newtxmath and siunitx packages together
I've just noticed that I'm compiling my documents I get something similar to the following warning:LaTeX Font Warning: Font shape `OT1/cmr/m/n' in size <5.5> not available(Font) size <5>...
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