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 hardnessType 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

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