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

Test item

Test method

Required value

Outer rubber

Inner rubber

1. Before aging

1.1 Tensile strength

18 MPa or more

10 MPa or more

1.2 Elongation

400 % or more

400 % or more

1.3 Hardness

60 ± 10 (Durometer hardness

Type A)

50 ± 10 (Durometer Hardness Type A)

2. After aging

Air oven aging, 70°C ± 1°C, 96 h

Air oven aging, 70°C ± 1°C, 96 h

2.1 Tensile strength

Not less than 80 % of the original

property

Not less than 80 % of the origi-

nal property

2.2 Elongation

Not less than 80 % of the original

property

Not less than 80 % of the origi-

nal property

2.3 Hardness

Not to exceed the original prop-

erty by more than 8

Not to exceed the original prop-

erty by more than 8

3. Tear

400 N/cm or more

No requirement

4. Compression set

30 %(70 ± 1 °C, 22hours) or less

No requirement

5. Static ozone aging test

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

No requirement

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