We investigate the tensile strength of filiform crystals of ammoniumand potassium dihydrogen phosphate (ADP and KDP) at room temperature and liquid nitrogen temperature as a function of their diameter for the two directions of growth <100> and <011>. It is observed that the filiform crystals, in contrast to macrocrystals of ADP and KDP, not only fail to break up during the low-temperature phase transition, but actually become stronger as the temperature is further decreased. It is shown that the observed strength of the filiform ADP and KDP crystals reaches 20-30% of the theoretical tensile strength.
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