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 ItemInspection MethodsOuter RubberInner Rubber
Before AgingTensile strengthISO 37 : 201118 Mpa or more10 Mpa or more
ElongationISO 37 : 2011400% or more.400% or more.
HardnessISO 7619-1: 201060 ±10 (Durometer hardness Type A)50 ±10 (Durometer hardness Type A)
After Aging Test method ISO188:1998 70±1C°× 96 hrsTensile strengthISO 37 : 2011Not less than 80% of the original propertyNot less than 80% of the original property
ElongationISO 37 : 2011Not less than 80% of the original propertyNot less than 80% of the original property
HardnessISO 7619-1: 2010Not to exceed the original property by more than 8Not to exceed the original property by more than 8
Tear resistanceISO 34-1 : 2010400 N/cm or moreNo requirement
Compression testISO 815-1 : 200830% (70±1C°for 22 hrs) or lessNo requirement
Static ozone aging testISO 1431-1 : 2012No cracks after elongation by 20% and exposure to 50 pphm at 40C°for 96 hrsNo 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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