>>
position: Home > About us > R & D > Materials

Materials

Material Selection

For our selected products, the most critical factor is material selection which is based on operational parameters including lifting requirements, operating depth and environments, and other factors in order to deliver cost effective products fit for purpose. .

 

Based on our comprehensive experience, you and your project will benefit from the most suitable and cost effective solutions available.

 

We are using a variety of industry standard and innovative material including:

 

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 and inflatable air-bags. (ISO 17357:2002)

 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

 

D. Material’s Specification for air-bags

 

Synthetic-tyre-cord layer is the framewok material. It controls the quality, endurance life, and pressure-holding performance. Based on selecting the perfect material & equipments, and adopting innovative processing techniques (whole enlacing technology), we made the super airbags with excellent performance as per CB/T3795-1996 standard.  

Item

Unit

1260 dtex/2

1870 dtex/2

Break Strength

N/ strand

≥ 215.6

≥ 284.2

Diameter

mm

0.65 ± 0.05

0.74 ± 0,05

Adhesion strength

N/cm

≤ 137.2

≤ 156.8

  

3.      High Tenacity Polyester Fabric – Polyurethane PVC blend coated fabric

 All the material of our PVC coasted fabric is imported from Korean.

 

The main properties is as follow:

   l         13.00 oz. fabric coated to total weight 48 oz/yd2 (1622 g/m2). Tensile Strength 924 lbs/in (8090 N/5cm)

   l         18.13 oz. fabric coated to total weight 56 oz/yd2 (1884 g/m2). Tensile Strength 1260 lbs/in (11034 N/5cm)

   l         28.30 oz. fabric coated to total weight 67 oz/yd2 (2278 g/m2). Tensile Strength 1484 lbs/in (13000 N/5cm)

   l         38.30 oz. fabric coated to total weight 89 oz/yd2 (3024 g/m2). Tensile Strength 2057 lbs/in (18000 N/5cm)

 

4.      Materials used for buoyancy include the following groups:

      l         EVA foam

l         Polyethylene Foam

l         Polyurethane Foam

l         Co-polymer Foam

l         Syntactic Foam

l         Polyurethane Elastomer

l         External coatings

         (Please contact us to get more detailed information.)

External coatings

Spray applied polyurethane elastomer
Tough, fatigue resistant elastomeric coating that provides optimised impact and abrasion resistance.
 
Moulded polyurethane elastomer
Provides the ultimate finish complemented by standard PU elastomer characteristics.
 
Spray applied GRP
Used on products where maximum structural integrity or mechanical protection is required.

Technology Standard (Pls contact us to get)
>> CB/T 3837-1998 Technological Requirements for ship Upgrading or Launching Relying on Air-bags 
      (Shipbuilding Industry Standard, PRC)
>> CB/T 3795-1996 / CB/T 3795-2009 Air bag for ship up to or down to launching way
      (Shipbuilding Industry Standard, PRC)
>> ISO 17357:2002 Ships and marine technology - High-pressure floating pneumatic rubber fenders
>> CB/T 3837-2001 / GB/T 21482-2008 Marine Pneumatic Rubber Fenders 
       (Ships Technology, PRC)
>> ISSA Code 43.027.00 PNEUMATIC FENDERS
>> ISSA Code 43.026.00 FOAM FENDERS


 

 

©2012 Qingdao Evergreen Maritime Co.,Ltd All right reserved.   鲁ICP备09008309号(www.miitbeian.gov.cn)