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Q
What is the basic construction of pneumatic rubber fenders ?
A

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.

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.


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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