{"id":1997,"count":4,"description":"\r\n\r\n\r\n\r\n\u041f\u041e\u041b\u0423\u0427\u0418\u0422\u042c \u0426\u0415\u041d\u0423 \u0421\u0415\u0414\u041b\u0410 \u041a\u041b\u0410\u041f\u0410\u041d\u0410 PCTFE<\/strong><\/a>\r\n\r\n\r\n\r\n\r\n

\u0427\u0442\u043e \u0442\u0430\u043a\u043e\u0435 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u041f\u0425\u0422\u0424\u042d?<\/h2>\r\n\r\n\r\n\r\n\r\n\u041f\u0425\u0422\u0424\u042d (\u043f\u043e\u043b\u0438\u0445\u043b\u043e\u0440\u0442\u0440\u0438\u0444\u0442\u043e\u0440\u044d\u0442\u0438\u043b\u0435\u043d) \u041f\u0425\u0422\u0424\u042d (\u043f\u043e\u043b\u0438\u0445\u043b\u043e\u0440\u0442\u0440\u0438\u0444\u0442\u043e\u0440\u044d\u0442\u0438\u043b\u0435\u043d) \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0441\u043e\u0431\u043e\u0439 \u0433\u043e\u043c\u043e\u043f\u043e\u043b\u0438\u043c\u0435\u0440 \u0445\u043b\u043e\u0440\u0442\u0440\u0438\u0444\u0442\u043e\u0440\u044d\u0442\u0438\u043b\u0435\u043d\u0430. PCTFE \u2014 \u0443\u043d\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 \u0444\u0442\u043e\u0440\u043f\u043e\u043b\u0438\u043c\u0435\u0440, \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u044b\u0439 \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u0442\u044c \u0441\u0432\u043e\u0438 \u0444\u0438\u0437\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u0430 \u043f\u0440\u0438 \u0438\u0441\u043a\u043b\u044e\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043d\u0438\u0437\u043a\u0438\u0445 \u0440\u0430\u0431\u043e\u0447\u0438\u0445 \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u0430\u0445.\r\n\r\n\r\n\r\n\r\n\r\nPCTFE \u043e\u0431\u043b\u0430\u0434\u0430\u0435\u0442 \u043f\u0440\u0435\u0432\u043e\u0441\u0445\u043e\u0434\u043d\u043e\u0439 \u0445\u0438\u043c\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u0441\u0442\u043e\u0439\u043a\u043e\u0441\u0442\u044c\u044e, \u0440\u0430\u0434\u0438\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0442\u043e\u0439\u043a\u043e\u0441\u0442\u044c\u044e \u0438 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0430\u043c\u0438 \u0432\u043e\u0441\u043f\u043b\u0430\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0441\u0442\u0438. \u041c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0438\u043c\u0435\u0435\u0442 \u043f\u043e\u043b\u0435\u0437\u043d\u044b\u0439 \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u043d\u044b\u0439 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u043e\u0442 -400\u00b0F \u0434\u043e 380\u00b0F. \u041f\u0425\u0422\u0424\u042d \u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432 \u043a \u0445\u043b\u0430\u0434\u043e\u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 \u0438 \u0438\u043c\u0435\u0435\u0442 \u0441\u0430\u043c\u044b\u0439 \u043d\u0438\u0437\u043a\u0438\u0439 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u0442\u0435\u043f\u043b\u043e\u0432\u043e\u0433\u043e \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u044f \u0441\u0440\u0435\u0434\u0438 \u0432\u0441\u0435\u0445 \u043d\u0435\u043d\u0430\u043f\u043e\u043b\u043d\u0435\u043d\u043d\u044b\u0445 \u0444\u0442\u043e\u0440\u043f\u043e\u043b\u0438\u043c\u0435\u0440\u043e\u0432. \u042d\u0442\u0438 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a\u0438 \u0434\u0435\u043b\u0430\u044e\u0442 \u0435\u0433\u043e \u043e\u0442\u043b\u0438\u0447\u043d\u044b\u043c \u0432\u044b\u0431\u043e\u0440\u043e\u043c, \u043a\u043e\u0433\u0434\u0430 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u0432 \u0438\u043c\u0435\u0435\u0442 \u0440\u0435\u0448\u0430\u044e\u0449\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435.\r\n\r\n\r\n\r\n\r\n\r\nPCTFE \u0447\u0430\u0441\u0442\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0432 \u0430\u044d\u0440\u043e\u043a\u043e\u0441\u043c\u0438\u0447\u0435\u0441\u043a\u043e\u0439 \u043f\u0440\u043e\u043c\u044b\u0448\u043b\u0435\u043d\u043d\u043e\u0441\u0442\u0438, \u043a\u043e\u0433\u0434\u0430 \u0442\u0440\u0435\u0431\u0443\u0435\u0442\u0441\u044f \u0445\u0438\u043c\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0441\u0442\u043e\u0439\u043a\u043e\u0441\u0442\u044c, \u0448\u0438\u0440\u043e\u043a\u0438\u0439 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0440\u0430\u0431\u043e\u0447\u0438\u0445 \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440 \u0438 \u043d\u0438\u0437\u043a\u0430\u044f \u0432\u043e\u0441\u043f\u043b\u0430\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0441\u0442\u044c. \u041e\u043d \u0442\u0430\u043a\u0436\u0435 \u0448\u0438\u0440\u043e\u043a\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0432 \u043a\u0440\u0438\u043e\u0433\u0435\u043d\u043d\u044b\u0445 \u043a\u043b\u0430\u043f\u0430\u043d\u0430\u0445.\r\n\r\n\r\n\r\n\r\n

\u041a\u043b\u044e\u0447\u0435\u0432\u044b\u0435 \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u0430 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u0430 PCTFE<\/h2>\r\n\r\n\r\n\r\n
    \r\n \t
  • \u0421\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0440\u0430\u0437\u043c\u0435\u0440\u043e\u0432, \u0436\u0435\u0441\u0442\u043a\u043e\u0441\u0442\u044c \u0438 \u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0441\u0442\u044c \u043a \u0445\u043b\u0430\u0434\u043e\u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438<\/li>\r\n \t
  • \u041e\u0447\u0435\u043d\u044c \u043d\u0438\u0437\u043a\u0430\u044f \u0433\u0430\u0437\u043e\u043f\u0440\u043e\u043d\u0438\u0446\u0430\u0435\u043c\u043e\u0441\u0442\u044c \u0438 \u0433\u0430\u0437\u043e\u0432\u044b\u0434\u0435\u043b\u0435\u043d\u0438\u0435<\/li>\r\n \t
  • \u041f\u043e\u0447\u0442\u0438 \u043d\u0443\u043b\u0435\u0432\u043e\u0435 \u043f\u043e\u0433\u043b\u043e\u0449\u0435\u043d\u0438\u0435 \u0432\u043b\u0430\u0433\u0438<\/li>\r\n \t
  • \u041e\u0442\u043b\u0438\u0447\u043d\u0430\u044f \u0445\u0438\u043c\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0441\u0442\u043e\u0439\u043a\u043e\u0441\u0442\u044c<\/li>\r\n \t
  • \u0412\u044b\u0441\u043e\u043a\u0430\u044f \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0441\u0436\u0430\u0442\u0438\u0435<\/li>\r\n \t
  • \u041d\u0438\u0437\u043a\u0430\u044f \u0434\u0435\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044f \u043f\u043e\u0434 \u043d\u0430\u0433\u0440\u0443\u0437\u043a\u043e\u0439<\/li>\r\n \t
  • \u041d\u0435 \u0432\u043e\u0441\u043f\u043b\u0430\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f<\/li>\r\n \t
  • \u0414\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440: \u043e\u0442 -400\u00b0 \u0434\u043e 380\u00b0F<\/li>\r\n \t
  • \u0420\u0430\u0434\u0438\u0430\u0446\u0438\u043e\u043d\u043d\u0430\u044f \u0441\u0442\u043e\u0439\u043a\u043e\u0441\u0442\u044c<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
    \r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
    \u0421\u0432\u043e\u0439\u0441\u0442\u0432\u043e<\/td>\r\n\u0426\u0435\u043d\u0438\u0442\u044c<\/td>\r\n\u0415\u0434\u0438\u043d\u0438\u0446\u044b<\/td>\r\n\u041c\u0435\u0442\u043e\u0434<\/td>\r\n<\/tr>\r\n
    \u041f\u0440\u0435\u0434\u0435\u043b \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u0438<\/td>\r\n4860 - 5710\r\n34 - 39<\/td>\r\npsi\r\nMPa<\/td>\r\n\u0414 638<\/td>\r\n<\/tr>\r\n
    \u0423\u0434\u043b\u0438\u043d\u0435\u043d\u0438\u0435<\/td>\r\n100 - 250<\/td>\r\n%<\/td>\r\n\u0414 638<\/td>\r\n<\/tr>\r\n
    \u041f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0438\u0437\u0433\u0438\u0431, 73\u00b0F<\/td>\r\n9570 - 10300\r\n66 - 71<\/td>\r\npsi\r\nMPa<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    \u041c\u043e\u0434\u0443\u043b\u044c \u0433\u0438\u0431\u043a\u043e\u0441\u0442\u0438<\/td>\r\n200 \u2013 243 x 103\r\n1.4 \u2013 1.7<\/td>\r\npsi\r\nMPa<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    \u0423\u0434\u0430\u0440\u043d\u0430\u044f \u0432\u044f\u0437\u043a\u043e\u0441\u0442\u044c, \u0418\u0437\u043e\u0434, 23 \u0433\u0440\u0430\u0434.\u0421<\/td>\r\n2,5 \u2013 3,5<\/td>\r\n\u0444\u0443\u0442-\u0444\u0443\u043d\u0442\/\u0434\u044e\u0439\u043c<\/td>\r\n\u0414 256<\/td>\r\n<\/tr>\r\n
    \u0421\u0436\u0438\u043c\u0430\u044e\u0449\u0435\u0435 \u043d\u0430\u043f\u0440\u044f\u0436\u0435\u043d\u0438\u0435 \u043f\u0440\u0438 \u0434\u0435\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 11\u0422\u041f3\u0422,<\/td>\r\n1570 \u2013 1860\r\n11 - 13<\/td>\r\npsi\r\nMPa<\/td>\r\n\u0414 695<\/td>\r\n<\/tr>\r\n
    \u041f\u043b\u043e\u0442\u043d\u043e\u0441\u0442\u044c<\/td>\r\n2,10\u20132,17<\/td>\r\n\u0433\/\u043a\u0443\u0431.\u0441\u043c<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    \u041a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u043b\u0438\u043d\u0435\u0439\u043d\u043e\u0433\u043e \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u044f<\/td>\r\n7 \u0445 10-5<\/td>\r\n\u041a-1<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    \u0422\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u0430 \u043f\u043b\u0430\u0432\u043b\u0435\u043d\u0438\u044f<\/td>\r\n410 -414\r\n210 - 212<\/td>\r\ndeg F\r\ndeg C<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    \u0422\u0435\u043f\u043b\u043e\u043f\u0440\u043e\u0432\u043e\u0434\u043d\u043e\u0441\u0442\u044c<\/td>\r\n1.45\r\n0.84<\/td>\r\nBtu\u00b7in\/h\u00b7ft2\u00b7\u00b0F\r\nW\/m\u00b7K<\/td>\r\n\u0410\u0421\u0422\u041c \u0421 177<\/td>\r\n<\/tr>\r\n
    \u0423\u0434\u0435\u043b\u044c\u043d\u0430\u044f \u0442\u0435\u043f\u043b\u043e\u0435\u043c\u043a\u043e\u0441\u0442\u044c<\/td>\r\n0.22\r\n0.92<\/td>\r\nBtu\/lb\/deg F\r\nkJ\/Kg\/deg K<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    \u0422\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u0430 \u0442\u0435\u043f\u043b\u043e\u0432\u043e\u0439 \u0434\u0435\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438, 66 \u0444\u0443\u043d\u0442\u043e\u0432\/\u043a\u0432.\u0434\u044e\u0439\u043c (0,455 \u041c\u041f\u0430)<\/td>\r\n259\r\n126<\/td>\r\ndeg F\r\ndeg C<\/td>\r\n\u0414 648<\/td>\r\n<\/tr>\r\n
    \u0422\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u0430 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438<\/td>\r\n620\r\n327<\/td>\r\ndeg F\r\ndeg C<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    \u0414\u0438\u044d\u043b\u0435\u043a\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c, \u043a\u0440\u0430\u0442\u043a\u043e\u0432\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f, 0,004 \u0434\u044e\u0439\u043c\u0430.<\/td>\r\n3000<\/td>\r\n\u0412\u043e\u043b\u044c\u0442\/\u043c\u0438\u043b<\/td>\r\n\u0414 149<\/td>\r\n<\/tr>\r\n
    \u0421\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u0434\u0443\u0433\u0438<\/td>\r\n360<\/td>\r\n\u0441\u0435\u043a<\/td>\r\n\u0414 495<\/td>\r\n<\/tr>\r\n
    \u041e\u0431\u044a\u0435\u043c\u043d\u043e\u0435 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, @ 50% RH<\/td>\r\n2 \u0445 1017<\/td>\r\n\u041e\u043c-\u0441\u043c<\/td>\r\n\u0414 257<\/td>\r\n<\/tr>\r\n
    \u041f\u043e\u0432\u0435\u0440\u0445\u043d\u043e\u0441\u0442\u043d\u043e\u0435 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, @ 100% RH<\/td>\r\n1 \u0445 1015<\/td>\r\n\u041e\u043c \u043a\u0432-1<\/td>\r\n\u0414 257<\/td>\r\n<\/tr>\r\n
    \u0414\u0438\u044d\u043b\u0435\u043a\u0442\u0440\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u043f\u0440\u043e\u043d\u0438\u0446\u0430\u0435\u043c\u043e\u0441\u0442\u044c, 1 \u043a\u0413\u0446<\/td>\r\n2.6<\/td>\r\n\u03b5<\/td>\r\n\u0414150-81<\/td>\r\n<\/tr>\r\n
    \u041a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u0440\u0430\u0441\u0441\u0435\u044f\u043d\u0438\u044f, @ 1 \u043a\u0413\u0446<\/td>\r\n0.02<\/td>\r\n<\/td>\r\n\u0414150-81<\/td>\r\n<\/tr>\r\n
    \u0412\u043f\u0438\u0442\u044b\u0432\u0430\u043d\u0438\u0435 \u0432\u043e\u0434\u044b<\/td>\r\n0.00<\/td>\r\n1\u0422\u041f3\u0422 \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u0435 \u0432\u0435\u0441\u0430<\/td>\r\n\u0414570-81<\/td>\r\n<\/tr>\r\n
    \u0420\u0435\u0439\u0442\u0438\u043d\u0433 \u043f\u043b\u0430\u043c\u0435\u043d\u0438+<\/td>\r\n\u041d\u0435 \u0432\u043e\u0441\u043f\u043b\u0430\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f<\/td>\r\n<\/td>\r\n\u0414 635<\/td>\r\n<\/tr>\r\n
    \u041a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u0442\u0440\u0435\u043d\u0438\u044f<\/td>\r\n<\/td>\r\n<\/td>\r\n\u0414 1894 \u0433.<\/td>\r\n<\/tr>\r\n
    \u0423\u0434\u0435\u043b\u044c\u043d\u044b\u0439 \u0432\u0435\u0441<\/td>\r\n2,10\u20132,17<\/td>\r\n<\/td>\r\n\u0414792<\/td>\r\n<\/tr>\r\n
    \u041a\u043e\u043d\u0441\u0442\u0430\u043d\u0442\u0430 \u0432\u043b\u0430\u0433\u043e\u043f\u0440\u043e\u043d\u0438\u0446\u0430\u0435\u043c\u043e\u0441\u0442\u0438<\/td>\r\n0.2<\/td>\r\n\u0433\/\u043c, 24 \u0447\u0430\u0441\u0430<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    O2 \u043f\u0440\u043e\u043d\u0438\u0446\u0430\u0435\u043c\u043e\u0441\u0442\u044c<\/td>\r\n1,5 \u0445 10-10<\/td>\r\nCc, \u0441\u043c\/\u043a\u0432.\u0441\u043c, \u0441\u0435\u043a, \u0430\u0442\u043c<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    N2 \u041f\u0440\u043e\u043d\u0438\u0446\u0430\u0435\u043c\u043e\u0441\u0442\u044c<\/td>\r\n0,18 \u0445 10-10<\/td>\r\nCc, \u0441\u043c\/\u043a\u0432.\u0441\u043c, \u0441\u0435\u043a, \u0430\u0442\u043c<\/td>\r\n<\/td>\r\n<\/tr>\r\n
    CO2 \u043f\u0440\u043e\u043d\u0438\u0446\u0430\u0435\u043c\u043e\u0441\u0442\u044c<\/td>\r\n2,9 \u0445 10-10<\/td>\r\nCc, \u0441\u043c\/\u043a\u0432.\u0441\u043c, \u0441\u0435\u043a, \u0430\u0442\u043c<\/td>\r\n<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n\r\n\r\n\r\n

    \u0421\u0435\u0434\u043b\u043e \u043a\u043b\u0430\u043f\u0430\u043d\u0430 PCTFE<\/h2>\r\n\r\n\r\n\r\n\r\n\u0421\u0435\u0434\u043b\u0430 \u0448\u0430\u0440\u043e\u0432\u044b\u0445 \u043a\u0440\u0430\u043d\u043e\u0432, \u043d\u0430 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u043d\u0430\u0431\u043b\u044e\u0434\u0430\u044e\u0442\u0441\u044f \u043f\u0440\u0438\u0437\u043d\u0430\u043a\u0438 \u043d\u0430\u0431\u0443\u0445\u0430\u043d\u0438\u044f, \u0432\u0437\u0434\u0443\u0442\u0438\u044f \u0438\u043b\u0438 \u00ab\u043f\u043e\u043f\u043a\u043e\u0440\u043d\u0430\u00bb, \u043f\u0440\u043e\u043d\u0438\u043a\u043b\u0438 \u043d\u0430 \u043c\u043e\u043b\u0435\u043a\u0443\u043b\u044f\u0440\u043d\u044b\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c. \u0418\u0437\u043b\u0438\u0448\u043d\u0435 \u0433\u043e\u0432\u043e\u0440\u0438\u0442\u044c, \u0447\u0442\u043e \u044d\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0432\u044b\u0437\u0432\u0430\u0442\u044c \u0441\u0435\u0440\u044c\u0435\u0437\u043d\u044b\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u0442\u0430\u043a\u0438\u0435 \u043a\u0430\u043a \u0443\u0442\u0435\u0447\u043a\u0438 \u0438 \u043a\u0430\u0442\u0430\u0441\u0442\u0440\u043e\u0444\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u043e\u0442\u043a\u0430\u0437. \u0420\u0435\u0448\u0435\u043d\u0438\u0435 \u0441\u043e\u0441\u0442\u043e\u0438\u0442 \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e\u0431\u044b \u043d\u0430\u0439\u0442\u0438 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b \u0441\u0435\u0434\u043b\u0430 \u0448\u0430\u0440\u043e\u0432\u043e\u0433\u043e \u043a\u043b\u0430\u043f\u0430\u043d\u0430, \u043e\u0431\u043b\u0430\u0434\u0430\u044e\u0449\u0438\u0439 \u0432\u044b\u0441\u043e\u043a\u043e\u0439 \u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432\u043e\u0441\u0442\u044c\u044e \u043a \u043f\u0440\u043e\u043d\u0438\u043a\u043d\u043e\u0432\u0435\u043d\u0438\u044e, \u0438 \u043e\u0442\u043b\u0438\u0447\u043d\u044b\u043c \u0432\u044b\u0431\u043e\u0440\u043e\u043c \u0431\u0443\u0434\u0435\u0442 PCTFE. \u0412 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0438 \u0431\u043b\u043e\u0433\u0430 \u043d\u0430 \u044d\u0442\u043e\u0439 \u043d\u0435\u0434\u0435\u043b\u0435 \u043c\u044b \u043f\u043e\u0433\u043e\u0432\u043e\u0440\u0438\u043c \u043e \u0441\u0435\u0434\u043b\u0430\u0445 \u0448\u0430\u0440\u043e\u0432\u044b\u0445 \u043a\u043b\u0430\u043f\u0430\u043d\u043e\u0432 PCTFE \u0438 \u043e \u0442\u043e\u043c, \u043a\u0430\u043a \u043e\u043d\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u0432 \u0443\u0441\u043b\u043e\u0432\u0438\u044f\u0445 \u043d\u0438\u0437\u043a\u043e\u0439 \u043f\u0440\u043e\u043d\u0438\u0446\u0430\u0435\u043c\u043e\u0441\u0442\u0438.\r\n\r\n\r\n\r\n\r\n\r\n\u041e\u0434\u043d\u0438\u043c \u0438\u0437 \u043b\u0443\u0447\u0448\u0438\u0445 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u043e\u0432 \u0434\u043b\u044f \u0441\u0435\u0434\u043b\u0430 \u0448\u0430\u0440\u043e\u0432\u043e\u0433\u043e \u043a\u043b\u0430\u043f\u0430\u043d\u0430, \u0433\u0434\u0435 \u043f\u0440\u043e\u043d\u0438\u0446\u0430\u0435\u043c\u043e\u0441\u0442\u044c \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u043e\u0439, \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f PCTFE (\u043f\u043e\u043b\u0438\u0445\u043b\u043e\u0440\u0442\u0440\u0438\u0444\u0442\u043e\u0440\u044d\u0442\u0438\u043b\u0435\u043d), \u0442\u0435\u0440\u043c\u043e\u043f\u043b\u0430\u0441\u0442\u0438\u0447\u043d\u044b\u0439 \u0445\u043b\u043e\u0440\u0444\u0442\u043e\u0440\u043f\u043e\u043b\u0438\u043c\u0435\u0440. PCTFE \u0438\u043d\u043e\u0433\u0434\u0430 \u043d\u0430\u0437\u044b\u0432\u0430\u044e\u0442 \u043c\u043e\u0434\u0438\u0444\u0438\u0446\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u043c PTFE \u0438\u043b\u0438 PCTFE, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0442\u043e\u0440\u0433\u043e\u0432\u044b\u043c\u0438 \u043d\u0430\u0437\u0432\u0430\u043d\u0438\u044f\u043c\u0438 Kel-F, Voltalef \u0438 Neoflon. \u041f\u041a\u0422\u0424\u042d \u0447\u0430\u0441\u0442\u043e \u043d\u0430\u0437\u044b\u0432\u0430\u044e\u0442 \u041f\u0422\u0424\u042d-\u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u043e\u043c \u0432\u0442\u043e\u0440\u043e\u0433\u043e \u043f\u043e\u043a\u043e\u043b\u0435\u043d\u0438\u044f, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0441\u043e\u0445\u0440\u0430\u043d\u044f\u0435\u0442 \u0445\u0438\u043c\u0438\u0447\u0435\u0441\u043a\u0443\u044e \u0438 \u0442\u0435\u0440\u043c\u0438\u0447\u0435\u0441\u043a\u0443\u044e \u0441\u0442\u043e\u0439\u043a\u043e\u0441\u0442\u044c \u041f\u0422\u0424\u042d, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043d\u0438\u0437\u043a\u0438\u0439 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u0442\u0440\u0435\u043d\u0438\u044f. \u041e\u043d \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0445\u043e\u0436 \u043d\u0430 \u0434\u0440\u0443\u0433\u0438\u0435 \u0444\u0442\u043e\u0440\u043f\u043e\u043b\u0438\u043c\u0435\u0440\u044b, \u0442\u0430\u043a\u0438\u0435 \u043a\u0430\u043a PFA \u0438\u043b\u0438 FEP.\r\n\r\n\r\n\r\n\r\n\r\n\u041e\u0434\u043d\u043e\u0439 \u0438\u0437 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u044e\u0449\u0438\u0445 \u0445\u0430\u0440\u0430\u043a\u0442\u0435\u0440\u0438\u0441\u0442\u0438\u043a PCTFE \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0442\u043e, \u0447\u0442\u043e \u043e\u043d \u0438\u043c\u0435\u0435\u0442 \u0433\u043e\u0440\u0430\u0437\u0434\u043e \u0431\u043e\u043b\u0435\u0435 \u043f\u043b\u043e\u0442\u043d\u0443\u044e \u043c\u043e\u043b\u0435\u043a\u0443\u043b\u044f\u0440\u043d\u0443\u044e \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0443 \u0438 \u043d\u0438\u0437\u043a\u043e\u0435 \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 \u043f\u0443\u0441\u0442\u043e\u0442 \u0438 \u043c\u0438\u043a\u0440\u043e\u043f\u043e\u0440\u0438\u0441\u0442\u043e\u0441\u0442\u0438 \u043f\u043e \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044e \u0441 \u0430\u043d\u0430\u043b\u043e\u0433\u0438\u0447\u043d\u044b\u043c\u0438 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u0430\u043c\u0438 \u0441\u0435\u0434\u043b\u0430 \u0448\u0430\u0440\u043e\u0432\u043e\u0433\u043e \u043a\u043b\u0430\u043f\u0430\u043d\u0430. \u042d\u0442\u043e \u0434\u0430\u0435\u0442 \u0435\u043c\u0443 \u043e\u0447\u0435\u043d\u044c \u043d\u0438\u0437\u043a\u0438\u0439 \u043a\u043e\u044d\u0444\u0444\u0438\u0446\u0438\u0435\u043d\u0442 \u043f\u0440\u043e\u043d\u0438\u0446\u0430\u0435\u043c\u043e\u0441\u0442\u0438, \u0430 \u044d\u0442\u043e \u043e\u0437\u043d\u0430\u0447\u0430\u0435\u0442, \u0447\u0442\u043e \u0432\u0435\u0440\u043e\u044f\u0442\u043d\u043e\u0441\u0442\u044c \u0435\u0433\u043e \u043d\u0430\u0431\u0443\u0445\u0430\u043d\u0438\u044f \u0438\u043b\u0438 \u043e\u0431\u0440\u0430\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u043f\u0443\u0437\u044b\u0440\u044c\u043a\u043e\u0432 \u043d\u0430\u043c\u043d\u043e\u0433\u043e \u043d\u0438\u0436\u0435, \u0447\u0435\u043c \u0443 \u0434\u0440\u0443\u0433\u0438\u0445 \u043c\u0430\u0442\u0435\u0440\u0438\u0430\u043b\u043e\u0432. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u0435\u0433\u043e \u043f\u0440\u043e\u043d\u0438\u0446\u0430\u0435\u043c\u043e\u0441\u0442\u044c \u0434\u043b\u044f O2, N2, CO2 \u0438 H2 \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 1,5 \u0445 10-10, 0,18 \u0445 10-10, 2,9 \u0445 10-10 \u0438 56,4 \u0445 10-10 \u0434\u0430\u0440\u0441\u0438 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e.\r\n\r\n\r\n\r\n\r\n\r\nPCTFE \u0442\u0430\u043a\u0436\u0435 \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u0435\u0442 \u0443\u043b\u0443\u0447\u0448\u0435\u043d\u043d\u0443\u044e \u0443\u0434\u0430\u0440\u043d\u0443\u044e \u0432\u044f\u0437\u043a\u043e\u0441\u0442\u044c \u0438 \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0445\u043e\u0440\u043e\u0448\u0435\u0435 \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u0441\u043b\u0435 \u0434\u0435\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u0438 \u043f\u0440\u0435\u0432\u043e\u0441\u0445\u043e\u0434\u043d\u043e\u0435 \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 \u043f\u043e\u043b\u0437\u0443\u0447\u0435\u0441\u0442\u0438 \u0438 \u0445\u043b\u0430\u0434\u043e\u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438. \u041a\u0440\u043e\u043c\u0435 \u0442\u043e\u0433\u043e, \u043e\u043d \u0438\u043c\u0435\u0435\u0442 \u0448\u0438\u0440\u043e\u043a\u0438\u0439 \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043d \u0440\u0430\u0431\u043e\u0447\u0438\u0445 \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440 \u043e\u0442 -100\u00b0F \u0434\u043e 500\u00b0F. \u0424\u0430\u043a\u0442\u0438\u0447\u0435\u0441\u043a\u0438, \u043e\u043d \u043e\u0447\u0435\u043d\u044c \u0445\u043e\u0440\u043e\u0448\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u043f\u0440\u0438 \u043a\u0440\u0438\u043e\u0433\u0435\u043d\u043d\u044b\u0445 \u0442\u0435\u043c\u043f\u0435\u0440\u0430\u0442\u0443\u0440\u0430\u0445. \u0418\u0437-\u0437\u0430 \u043d\u0438\u0437\u043a\u043e\u0433\u043e \u0442\u0440\u0435\u043d\u0438\u044f \u044d\u0442\u043e \u0442\u0430\u043a\u0436\u0435 \u043f\u0440\u0438\u0432\u043e\u0434\u0438\u0442 \u043a \u043e\u0447\u0435\u043d\u044c \u043d\u0438\u0437\u043a\u043e\u043c\u0443 \u0440\u0430\u0431\u043e\u0447\u0435\u043c\u0443 \u043a\u0440\u0443\u0442\u044f\u0449\u0435\u043c\u0443 \u043c\u043e\u043c\u0435\u043d\u0442\u0443 \u0448\u0430\u0440\u043e\u0432\u043e\u0433\u043e \u043a\u0440\u0430\u043d\u0430. PCTFE \u0442\u0430\u043a\u0436\u0435 \u043d\u0435 \u043f\u043e\u0433\u043b\u043e\u0449\u0430\u0435\u0442 \u0432\u043b\u0430\u0433\u0443 \u0438 \u043d\u0435 \u0441\u043c\u0430\u0447\u0438\u0432\u0430\u0435\u0442\u0441\u044f.\r\n\r\n\r\n\r\n\r\n\r\nPCTFE \u0445\u043e\u0440\u043e\u0448\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u0432 \u0443\u0441\u043b\u043e\u0432\u0438\u044f\u0445 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438, \u0433\u0434\u0435 \u0434\u0440\u0443\u0433\u0438\u0435 \u043f\u043e\u043b\u0438\u043c\u0435\u0440\u044b \u043c\u043e\u0433\u0443\u0442 \u0432\u044b\u0439\u0442\u0438 \u0438\u0437 \u0441\u0442\u0440\u043e\u044f. \u041d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043e\u043d \u0445\u043e\u0440\u043e\u0448\u043e \u043f\u0440\u0438\u0441\u043f\u043e\u0441\u043e\u0431\u043b\u0435\u043d \u0434\u043b\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u044f\u0434\u0435\u0440\u043d\u043e\u0439 \u0441\u0444\u0435\u0440\u0435, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u043c\u043e\u0436\u0435\u0442 \u0432\u043a\u043b\u044e\u0447\u0430\u0442\u044c \u0432\u044b\u0441\u043e\u043a\u043e\u0435 \u0440\u0430\u0434\u0438\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0435 \u0432\u043e\u0437\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0435, \u043d\u0435\u0433\u043e\u0440\u044e\u0447 (D 635) \u0438 \u0443\u0441\u0442\u043e\u0439\u0447\u0438\u0432 \u043a \u0432\u043e\u0437\u0434\u0435\u0439\u0441\u0442\u0432\u0438\u044e \u043f\u043e\u0434\u0430\u0432\u043b\u044f\u044e\u0449\u0435\u0433\u043e \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0430 \u0445\u0438\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0432\u0435\u0449\u0435\u0441\u0442\u0432 \u0438 \u043e\u043a\u0438\u0441\u043b\u0438\u0442\u0435\u043b\u0435\u0439. \u0415\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u043c\u0438 \u0445\u0438\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u043c\u0438 \u0432\u0435\u0449\u0435\u0441\u0442\u0432\u0430\u043c\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043c\u043e\u0433\u0443\u0442 \u043f\u0440\u0438\u0432\u0435\u0441\u0442\u0438 \u043a \u043d\u0435\u0431\u043e\u043b\u044c\u0448\u043e\u043c\u0443 \u043d\u0430\u0431\u0443\u0445\u0430\u043d\u0438\u044e, \u044f\u0432\u043b\u044f\u044e\u0442\u0441\u044f \u043f\u0440\u043e\u0441\u0442\u044b\u0435 \u0438 \u0441\u043b\u043e\u0436\u043d\u044b\u0435 \u044d\u0444\u0438\u0440\u044b, \u0430\u0440\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0440\u0430\u0441\u0442\u0432\u043e\u0440\u0438\u0442\u0435\u043b\u0438 \u0438 \u0433\u0430\u043b\u043e\u0433\u0435\u043d\u0443\u0433\u043b\u0435\u0440\u043e\u0434\u043d\u044b\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f.\r\n\r\n","link":"https:\/\/zecovalve.com\/ru\/tag\/pctfe-valve-seat","name":"\u0421\u0435\u0434\u043b\u043e \u043a\u043b\u0430\u043f\u0430\u043d\u0430 PCTFE","slug":"pctfe-valve-seat","taxonomy":"post_tag","meta":[],"yoast_head":"\nPCTFE Valve Seat - PCTFE Material | ZECO Valve<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/zecovalve.com\/ru\/tag\/pctfe-valve-seat\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"PCTFE Valve Seat - PCTFE Material | ZECO Valve\" \/>\n<meta property=\"og:description\" content=\"GET PCTFE VALVE SEAT PRICE What is PCTFE Material? PCTFE (Polychlorotrifluoroethylene) PCTFE (Polychlorotrifluoroethylene) is a homopolymer of Chlorotrifluoroethylene. PCTFE is a unique fluoropolymer that is capable of maintaining its physical properties at exceptionally low operating temperatures. PCTFE has excellent chemical resistance, radiation resistance, and flammability characteristics. The material has a useful temperature range of -400\u00b0F to 380\u00b0F. PCTFE is resistant to cold flow and it has the lowest coefficient of thermal expansion of any unfilled fluoropolymer. These characteristics make it an excellent choice when dimensional stability is critical. PCTFE is often used for aerospace applications when chemical resistance, a broad operating temperature range, and low flammability are required. It is also extensively used for cryogenic valve applications. Key Properties of PCTFE Material Dimensionally stable, rigid, and resistant to cold flow Very low gas permeation and outgassing Near zero moisture absorption Excellent chemical resistance High compression strength Low deformation under load Non-flammable Temperature range: -400\u00b0 to 380\u00b0F Radiation Resistance Property Value Units Method Tensile Strength 4860 – 5710 34 – 39 psi MPa D 638 Elongation 100 – 250 % D 638 Flexural Strength, 73\u00b0F 9570 – 10300 66 – 71 psi MPa Flex Modulus 200 \u2013 243 x 103 1.4 \u2013 1.7 psi MPa Impact Strength, Izod, 23 deg C 2.5 \u2013 3.5 ft-lb\/in D 256 Compressive Stress at 1% deformation, 1570 \u2013 1860 11 – 13 psi MPa D 695 Density 2.10 to 2.17 gm\/cu.cm Coefficient of Linear Expansion 7 x 10-5 K-1 Melting Point 410 -414 210 – 212 deg F deg C Thermal Conductivity 1.45 0.84 Btu\u00b7in\/h\u00b7ft2\u00b7\u00b0F W\/m\u00b7K ASTM C 177 Specific Heat 0.22 0.92 Btu\/lb\/deg F kJ\/Kg\/deg K Heat Distortion Temperature, 66 lb\/sq.in (0.455 MPa) 259 126 deg F deg C D 648 Processing Temperature 620 327 deg F deg C Dielectric Strength, short time, 0.004\u201d 3000 Volt\/mil D 149 Arc-Resistance 360 sec D 495 Volume Resistivity, @ 50% RH 2 x 1017 ohm-cm D 257 Surface Resistivity, @ 100% RH 1 x 1015 Ohm sq-1 D 257 Dielectric Constant, 1 kHz 2.6 \u03b5 D150-81 Dissipation Factor, @ 1 kHz 0.02 D150-81 Water Absorption 0.00 % increase in weight D570-81 Flame Rating+ Non-flammable D 635 Coefficient of friction D 1894 Specific Gravity 2.10 to 2.17 D792 Moisture Permeability Constant 0.2 g\/m, 24 hours O2\u00a0Permeability 1.5 x 10-10 Cc, cm\/sq.cm, sec, atm N2\u00a0Permeability 0.18 x 10-10 Cc, cm\/sq.cm, sec, atm CO2\u00a0Permeability 2.9 x 10-10 Cc, cm\/sq.cm, sec, atm PCTFE Valve Seat Ball valve seats that show signs of swelling, blistering, or \u201cpopcorning\u201d have been permeated at a molecular level. Needless to say, this can cause some serious issues such as leaks and catastrophic failure. The solution is to find a ball valve seat material that is highly resistant to permeation and an excellent choice would be PCTFE. In this week\u2019s blog post, we will talk about PCTFE Ball Valve Seats and how they are used in Low Permeation Applications. One of the best materials for a ball valve seat application where permeability is a problem would be PCTFE (Polychlorotrifluoroethylene), a thermoplastic chlorofluoropolymer. PCTFE is sometimes referred to as Modified PTFE or PCTFE, as well as by trade names Kel-F, Voltalef, and Neoflon. PCTFE is often thought of as a second-generation PTFE material that maintains the chemical and thermal resistance of PTFE along with its low friction. It is also similar to other fluoropolymers such as PFA or FEP. One of the defining characteristics of PCTFE is that it has a much more dense molecular structure and a low void and micro-porosity content when compared to similar ball valve seat materials. This gives it a very low permeability coefficient, which means that the likelihood of it swelling or popcorning is far lower than other materials. For example, its permeability for O2, N2, CO2, and H2 are 1.5 x 10-10, 0.18 x 10-10, 2.9 x 10-10, and 56.4 x 10-10 darcy, respectively. PCTFE also provides improved toughness and strength along with good deformation recovery and excellent creep and cold-flow resistance. In addition, it has a wide operating temperature range of -100\u00b0F to 500\u00b0F. In fact, it performs extremely well at cryogenic temperatures. Because of its low friction, it also results in a very low ball valve operating torque. PCTFE also exhibits zero moisture absorption and is non-wetting. PCTFE works well in operating environments where other polymers may fail. For example, it is well adapted to nuclear service that may involve high radiation exposure, is non-flammable (D 635), and is resistant to attack by the vast majority of chemicals and oxidizing agents. 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