What is the basic construction of pneumatic rubber fenders ?

The Floating-type Yokohama Pneumatic Rubber Fenders are kind of a cylindrical air bag with hemispherical heads at both ends. Basic body construction of this fender consists of an outer rubber layer, cord layers and an inner rubber layer. All of these are vulcanized together, and then proven by hydraulic pressure test.

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Outer Rubber

The outer rubber layer protects the cord layers and inner rubber layer from abrasion and other external forces. This compound has sufficient tensile and tear strength to withstand any weather condition and hard usage. Standard color is black, but other colors such as grey and creamy white are available on request.

Test Item Inspection Methods Outer Rubber Inner Rubber
Before Aging Tensile strength ISO 37 : 2011 18 Mpa or more 10 Mpa or more
Elongation ISO 37 : 2011 400% or more. 400% or more.
Hardness ISO 7619-1: 2010 60 ±10 (Durometer hardness Type A) 50 ±10 (Durometer hardness Type A)
After Aging Test method ISO188:1998 70±1C°× 96 hrs Tensile strength ISO 37 : 2011 Not less than 80% of the original property Not less than 80% of the original property
Elongation ISO 37 : 2011 Not less than 80% of the original property Not less than 80% of the original property
Hardness ISO 7619-1: 2010 Not to exceed the original property by more than 8 Not to exceed the original property by more than 8
Tear resistance ISO 34-1 : 2010 400 N/cm or more No requirement
Compression test ISO 815-1 : 2008 30% (70±1C°for 22 hrs) or less No requirement
Static ozone aging test ISO 1431-1 : 2012 No cracks after elongation by 20% and exposure to 50 pphm at 40C°for 96 hrs No requirement

Synthetic-tire-cord Layer

The reinforcement cord layers, which are made of Synthetic-tire-cord, are arranged at ideal angles to hold the internal pressure and to distribute the stress evenly. As the main fibers of the synthetic-tire-cord are not braided like synthetic canvas fabric or synthetic belt fabric, there are advantages for its fatigue-resistance performance and pressure-holding performance.

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Inner Rubber

The inner rubber layer seals the air inside, utilizing a compound equivalent to that of the liner or tube of an automobile tire. 

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