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      Rubber compound for hoses of turbine boosters

      No.

      Test item

      Performance indexes        (inner layer)

      Performance indexes      (external layer)

      1

      Hardness (Shores A)                  Degree

      55±5or drawing

      55±5or drawing

      2

      Tensile strength                     MPa

      ≥10.0

      ≥10.0

      3

      Elongation at break                   %

      200~600

      200~600

      4

      Tear strength DIN ISO34-1 method A          kN/m

      ≥5.0

      ≥5.0

      5

      Heat resistance 125℃×94h    

      Tensile strength    Degree

      0~+6

      0~+6

      Elongation at break    MPa

      ≥9.0

      ≥9.0

      Tear strength           %

      180~550

      180~550

      Tear strength         kN/m

      ≥4.0

      ≥4.0

      6

      Heat resistance 110℃×504h    

      Change in hardness Degree

      0~+8

      0~+8

      Tensile strength     MPa

      ≥9.0

      ≥9.0

      Elongation atbreak     %

      180~550

      180~550

      7

      Oil resistance 125℃×94h     

      Change in hardness Degree

      -8~+8

      /

      Elongation at break   MPa

      ≥9.0

      /

      Tear strength            %

      ≥150

      /

      Mass change ratio       %

      -4~+8

      /

      Tear strength         N/m

      ≥2.5

      /

      8

      Oil resistance 110℃×504h    

      Change in hardness Degree

      -8~+10

      /

      Tensile strength      MPa

      ≥9.0

      /

      Elongation at break     %

      ≥140

      /

      Mass change ratio       %

      -4~+10

      /

      9

      Diesel resistance23℃×46h     

      Change in hardness Degree

      /

      -20~0

      Tensile strength      MPa

      /

      6

      Elongation at break     %

      /

      ≥180

      Mass change ratio       %

      /

      0~+25

      10

      Low-temperature performance   (-35℃/22h)

      -30℃ No breaking

      -30℃No breaking

      11

      Compression permanent set PV3307  125℃X22h  %

      ≤85

      ≤85

      12

      Compression permanent set PV3307   23℃X94h  %

      ≤60

      ≤60

      13

      Copper corrosion V.W.2.8.1

      Slight oxidation trace allowable

      Slight oxidation trace allowable

      14

      Ozone aging (test piece not tested) 200pphm/46h/25℃/60/20%

      No cracking 

      No cracking 

      15

      Ozone aging  (after 125℃×94h) 200pphm/46h/25℃/60/20%  VW2.8.1

      No cracking 

      No cracking 

      16

      Ozone aging (after 125℃×94hmchine oil aging ) 200pphm/46h/25℃/60/20%      

      No cracking 

      No cracking 

      17

      Peel strength of external layer     N/mm

      ≥3.0

      ≥3.0


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