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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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