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Hurrah! :)
I found the solution.
There are probably some internal parameters which control inter-word spacing, its minimum and maximum values, and I didn't found them.
But in my case the solution was to use \sloppypar{} environment. None of hbox overfull through the whole section! Perfect ...

Thanks for fast replies and suggestions. I'm writing in English so there are default settings for hyphenation. In the normal text everything is OK, but I have one section in my work which consists entirely of chemical procedures, full of chemical names, formulas, numbers with units etc.
Here is an ...

Hello!
I found latex to be very strict about spaces between words.
I have part of the text in my thesis with technical information and hbox overfulls occurs all the time (the text is really problematic to hyphenate correctly even manually).
I tried to solve the problem by inserting \libenreak[x ...