Complete Test Process for Marine Rubber Fender System

Complete test process for marine rubber fender system

RUBBER PROPERTIES

Taidun rubber fender components are manufactured from the highest quality Natural Rubber (NR),optionally Styrene Butadiene SBR based compounds which meet or exceed the performance requirements of European Union specification EAU-E62"Acceptance Requirements for Fender Elastomers".Typical specifications are listed in the table below.

In addition to NR and SBR,other rubber compounds in Butyl,EPDM,and Polyurethane are available on request for specialist applications.Please consult Taidun for further details.

Property	Testing Standard	Condition	Requirement
Tensile Strength	ASTM D412 Die C;AS 1180.2;BS 903.A2; ISO 37;JIS K6301 Item 3,Dumbell3	Original	16MPa(Min)
		Aged for 96 hours at 70℃	12.8MPa(Min)
	DIN 53504	Original	15N/mm²(Min)
		Aged for 168 hours at 70℃	12.75N/mm²(Min)
Elongation at Break	ASTM D412 Die C;AS 1180.2;BS 903.A2; ISO 37;JIS K6301 Item 3,Dumbell 3	Original	400%(Min)
		Aged for 96 hours at 70℃	320%(Min)
	DIN 53504	Original	300%(Min)
		Aged for 168 hours at 70℃	280%(Min)
Hardness	ASTM D2240;AS 1683.15.2;BS 903.A6; ISO 815;JIS K6301 Item 5A Tester	Original	78°(Max)Shore A
		Aged for 96 Hours at 70℃	Original  Value+6° points increase
	DIN 53505	Original	75°(Max)Shore A
		Aged for 168 hours at 70℃	Original  Value+5° points increase
Compression Set	ASTM D395;AS 1683.13B;BS 903.A6; ISO 815;JIS K6301 Item 10	Aged for 22 hours at 70℃	30%(Max)
	DIN 53517	Aged for 24 hours at 70℃	40%(Max)
Tear Resistance	ASTM D624;AS 1683.12;BS 903.A3; ISO 34.1;JIS K6301 Item 9,Test Piece A	Die B	70kN/m(Min)
	DIN 53507		80 N/cm(Min)
Ozone Resistance	ASTM D1149;AS 1683.24; BS 903.A43;DIN 53509;ISO 143/1	1ppm at 20%strain at 40℃ for 100 hours	No cracking visible by eye
Seawater Resistance	DIN 86076,Section 7.7	28 days in artificial seawater at 95℃±2℃	Hardness±10°(Max) Shore A Volume +10/-5%(Max)
Abrasion Resistance	BS 903.A9	Method B,1000 revolutions	0.5cc(Max)
	DIN 53516		100mm³(Max)
Bond Strength Steel to Rubber	BS 903.A21	Method B	7N/mm(Min)

The above values are for tests carried out under strict laboratory conditions using specimens taken from batches of unvulcanised rubber compound.

 

PERFORMANCE TESTING

Moulded and wrapped cylindrical fenders are routinely tested as a part of Taidun commitment to quality.All testing is conducted in-house,with the option of third party witnessing,using full size fenders in accordance with the PIANC³guidelines below.

1)All fender units shall be given a unique serial number which can be traced back to manufacturing and testing records.

2)Fenders shall be tested under direct (vertical)compression.

3)Compression speed shall be 2~8 cm/min.

4)Test temperature shall be 23℃±5°℃4.

5)Reaction force shall be recorded at intervals to at least a deflection at which the permitted minimum energy absorption is achieved.

6)Energy absorption shall be determined as the integral of reaction and deflection,calculated using Simpson's Rule.

7)The result of the first compression cycle shall not be recorded.

8)The average performance from the second and third compression cycles shall be less than the permitted maximum reaction and more than the permitted minimum energy absorption.

9)Sampling shall be 1 in 10 fenders (rounded up to a unit)

10)If any sample does not satisfy the specifications,sampling of the remainder shall be increased to1 in 5 fenders (rounded up to a unit),excluding non-compliant units.

11)If any further sample does not satisfy the specifications,all remaining samples shall be tested.Only units which satisfy the specifications shall be passed for shipment.

12)Non-compliant units shall be clearly marked and isolated.

TOLERANCES

All Taidun fenders are subject to standard manufacturing and performance tolerances.For specific applications,smaller tolerances may be agreed on a case by case basis.

Manufacturing Tolerances
Moulded Fenders	All dimensions Bolt hole pitch	±3%or±2mm¹ ±2mm
Composite Fenders	Cross-section Length	±3%or±2mm¹ ±2%or±25mm¹
	Drilled hole centres Counterbore depth	±4mm(non-cumulative) ±2mm(under head depth)
Block Fenders Cube Fenders M Fenders	Cross-section Length	±2%or±2mm¹ ±2%or±10mm¹
	Fixing hole centres Fixing hole diameter	±3mm ±3mm
Cylindricals Fenders	Outside diameter Inside diameter Length	±4% ±4% -0/+40mm
Extruded Fenders	Cross-section Length	±4% -0/+40mm
	Drilled hole centres Counterbore depth	±4mm(non-cumulative) ±2mm(under head depth)
HD-PE Sliding Fenders²	Cross-section Length	±4% ±2%or±10mm¹
	Drilled hole centres Counterbore depth	±2mm(non-cumulative) ±2mm(under head depth)
UHMW-PE Face Pads²	Length &width &width	±5mm(cut pads) ±20mm(uncut  sheets)
	Thickness:≤30mm (Planed)31~100mm ≥101mm	±0.2mm ±0.3mm ±0.5mm
	Thickness:≥30mm (Unplaned)31~100mm ≥101mm	±2.5mm ±4.0mm ±6.0mm
	Drilled hole centres Counterbore depth	±2mm(non-cumulative) ±2mm(under head depth)