Chelik yong’inga chidamli eshik zarbaga chidamli bo’lib, struktura yong’inning oldini olish samaradorligini kamaytirmasdan uzoq muddatli ta’sirga bardosh bera oladi va yong’inga qarshi hidrantlarning ta’siriga dosh bera oladi. Chelik yong’inga chidamli eshik isitish vaqtida past deformatsiya tezligiga va isitishdan keyin kam egrilikka ega.

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