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.
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Outer and inner rubber material requirements | |||
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Test item |
Test method |
Required valuve | |
|
Out rubber |
Inner rubber | ||
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1. Before ageing |
--- |
--- |
--- |
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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 |
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4. Compression set |
ISO 815:1991 |
30% (70℃±1℃ for 22h) or less |
No requirement |
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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 |
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NOTE: If the color of the other cover is not black, the material requirements will differ from those in this table | |||
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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)
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.
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.
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Table 1 Synthetic tyre cord |
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Table 2 Canvas fabric | ||||||
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Item |
Unit |
Warp |
Weft |
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Item |
Unit |
Warp |
Weft |
|
Density |
Ends/inch |
24 |
2 |
|
Density |
Ends/inch |
16 |
16 |
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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
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
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.
>> CB/T 3837-1998 Technological Requirements for ship Upgrading or Launching Relying on Air-bags
>> 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