>>

Pneumatic Fenders Properties

 

Material Properties of Pneumatic Fenders

 

1. Rubber  

The selection of our rubber is strictly accordance with the requirement of ISO 17357:2002.

Outer and inner rubber material requirements

Test item

Test method

Required valuve

Out rubber

Inner rubber

1. Before ageing

---

---

---

1.1 Tensile strength

ISO 37:1994

18 MPa or more

10MPa or more

1.2 Elongation

ISO 37:1994

400% or more

400% or more

1.3 Hardness

ISO 7619:1997

60 ±10

(Durometer hardness Type A)

50 ±10

(Durometer hardness Type A)

2. After ageing

ISO 188:1998

Air oven ageing, 70±1 96h

Air oven ageing, 70±1 96h

2.1 Tensile strength

ISO 37:1994

Not less than 80% of the original property

Not less than 80% of the original property

2.2 Elongation

ISO 37:1994

Not less than 80% of the original property

Not less than 80% of the original property

2.3 Hardness

ISO 7619:1997

Not to exceed that original property by more than 8

Not to exceed the original property by more than 8

3. Tear

ISO 34-1:1994

400 N/cm or more

No requirement

4. Compression set

ISO 815:1991

30% (70±1 for 22h) or less

No requirement

5. Static ozone ageing test

ISO 1431-1:1989

No cracks after elongation by 20% and exposure to 50 pphma at 40 for 96 h

No requirement

NOTE: If the color of the other cover is not black, the material requirements will differ from those in this table

apphm: Parts of ozen per hundred million of air by volume.

Other type’s rubber, such as NR, EPDM, SBR, BR, are employed as per the special ingredient.

  

2. Synthetic-tyre-cord layer for Pneumatic Fenders (ISO17357:2002)

 

A. General

Synthetic-tyre-cord layers, commonly used in tyres, have been proven to provide strong efficient reinforcement layers in fenders, Each single layer is coated with rubber compound on both sides as well as in between synthetic-tyre-cord threads, hence isolating all cords from each other.

 

As contact between synthetic-tyre-cord threads does not occur, synthetic tyre cord has the advantage over other reinforcement materials such as canvas fabric of reducing friction and wears between cord threads during compression, bending and stretching, and also greatly improves fatigue resistance, endurance life, and pressure-holding performance.

 

B. Difference in arrangement of synthetic-tyre-cord and canvas-fabric reinforcement layers.

   

C. Example of difference in the physical property of synthetic tyre cord and canvas fabric

 
The synthetic-tyre-cord arrangement has strength in one direction only (warp) and the canvas-fabric arrangement strength in both direction (weft and warp). Table 1 and Table 2 provide an example of the difference in physical properties between the two. 
 

Table 1 Synthetic tyre cord

 

Table 2 Canvas fabric

Item

Unit

Warp

Weft

 

Item

Unit

Warp

Weft

Density

Ends/inch

24

2

 

Density

Ends/inch

16

16

Tensile strength

N/mm2

20

0.02

 

Tensile strength

N/mm2

11.6

11.7

 

Home  |   About Us  |   Products & Solutions  |   Fender Design & Test  |   New & Media  |   Contact Us
©2008 Qingdao Evergreen Shipping Supplies Co.,Ltd All rights reserved.   鲁ICP备09008309号(www.miitbeian.gov.cn)