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  (Webster)
(Webster)
: 49 500 .

(Webster) - ASTM B647. ( ).
ʠ (100%) () , .

- .

ASTM B647 0,5HW. : , .

  (Barcol)
(Barcol)
: 71 500 .

(Barcol) , - . ASTM 648-00, ASTM HD2583-07 GB/T 38542005. : , .



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