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

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

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