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What are Outer and inner rubber material requirements for Yokohama type floating fenders

What are Outer and inner rubber material requirements for Yokohama type floating fenders
Update Time:2019-07-20

Test item

Test method

Required value

Outer rubber

Inner rubber

1. Before aging

1.1 Tensile strength

ISO 37:2011

18 MPa or more

10 MPa or more

1.2 Elongation

ISO 37:2011

400 % or more

400 % or more

1.3 Hardness

ISO 7619-1:2010

60 ± 10 (Durometer hardness

Type A)

50 ± 10 (Durometer Hardness Type A)

2. After aging

ISO 188:2011

Air oven aging, 70°C ± 1°C, 96 h

Air oven aging, 70°C ± 1°C, 96 h

2.1 Tensile strength

ISO 37:2011

Not less than 80 % of the original

property

Not less than 80 % of the origi-

nal property

2.2 Elongation

ISO 37:2011

Not less than 80 % of the original

property

Not less than 80 % of the origi-

nal property

2.3 Hardness

ISO 7619-1:2010

Not to exceed the original prop-

erty by more than 8

Not to exceed the original prop-

erty by more than 8

3. Tear

ISO 34-1:2010

400 N/cm or more

No requirement

4. Compression set

ISO 815-1:2008

30 %(70 ± 1 °C, 22hours) or less

No requirement

5. Static ozone aging test

ISO 1431-1:2012

No cracks after elongation by 20 % and exposure to 50 pphma at 40 °C for 96 h

No requirement