First issued: April 1, 2014
Rev.1: July 7, 2016
Rev.2: July 17, 2020

Issued by the SCOPE of Japan

Standard Procedure to Durability Test forRubber Fender Units- Implementation Details -For the items not specified in the Standard Procedures for Durability Test for Rubber Fender Units stipulatedby the SCOPE, the following particulars specified in this Implementation Details shall be applied:
1．Test Specimens
Test Specimens shall be selected as stipulated in “Clause 2. Test Specimens” of the Standard Procedures forDurability Test for Rubber Fender Units. Sizes of the test specimen specified in clause 2.2, shall be within therange of cross hatched area in Fig.1.

Fig. 1 Conceptual diagram for selecting specimens

2．Performance tests(1) Residual deflection
For the post repetitive compression performance, the residual strain of the specimens caused by the repetitivecompression, shall be included in the amount of compression and the repetitive compression starts from thesame point as the compression started. Total deflection applied for this test shall be the same before and after
the repetitive test as shown in Fig. 2.

Fig. 2 Conceptual diagram of performance test protocol

The reaction force and absorbed energy are explained in Fig. 3.

Fig. 3 Example figure of reaction force curves before and after repetitive test
*Energy absorption (Fig. 3)
The absorbed energy E1 before the repetitive compression test is obtained from the area of the portion
surrounded by ABC. The reaction force is R1. Note that the absorbed energy E2’ after repetitive compressionis the area surrounded by A' B' C and not A' B "C’. Therefore, the reaction force of Post repetitive
compression is R2’

The Appendix Table-A (1) Durability, in "Rubber Fender Durability Certification Examination Criteria"
requests to check whether "energy absorption" and "reaction force" significantly reduced after the repetitivecompression. In carrying out the above test method, the durability should be confirmed through the following
steps Ⅰ to Ⅳ. If all of them can be confirmed as having no problem, it is judged to be acceptable.
Ⅰ. Visually confirm that no defects such as cracks etc. have occurred.
Ⅱ. Confirm the degradation in “energy absorption” before/ after the repetitive compression.
*For a guideline for buckling type fenders, the degradation of energy absorption should be less than 20%
Ⅲ. Confirm that there is no significant degradation in the reaction force curve before/ after the repetitivecompression.
*For a guideline for buckling type fenders, the degradation of reaction force should be less than 20% andkeep the buckling curve with a peak.
Ⅳ. Confirm that the residual strain is not large.
*For a guideline for buckling type fenders, residual strain should be less than 5%.
(2) Performance test after the repetitive compression test
The post cyclic compression performance test shall be completed within 24 hours after the final compression
test.
(3) Check items
Table 1. Items to be checked in the static compression tests
Timing of measurement
Pre (Before)
repetitive compression

repetitive compression

Criteria etc.

Date and time of the test
Before the test

Specimen temperature
Height of specimen

Before the test
Post (After)

Measurement items

On completionof the test

At the size inspection

Date and time of the test
Height of specimen

Measuring residual strain

Date and time of the test

Within 24 hours after thecompletion of repetitive
compression test.

3．Repetitive Compression Test
Check items
Table 2 Items to be checked in the repetitive compression test
Timing of measurement

Measurement items

Test run without

Compression cycle

Within 150s per one cycle

specimen * 1

Deflection (stroke)

To the design deflection

When specimens are put

Compression angle

At the angle (90°) to the surfaces of specimens to bein place

Criteria etc.

subjected to pressure (rubber fender units) * 2

Repetitive Compression Test

Date and time when
Before starting

tests begin

test

Temperature ofspecimen

During the test * 3

Compression cycle

Within 150s per one cycleDeflection (stroke)

To the design deflection

Number of cycle

3,000 times or more

Ambient
temperature
On testcompletion
Visual inspection

23℃±5℃

Within 3m from specimen in same space without partition.

Date and time
Temperature ofspecimen
Examination ofcracks

There are no defects such as cracks etc. to the naked eyes.

* 1 Check if the measured cycle and stroke of the tester are consistent with the measured values.
* 2 Check visually.
* 3 For items measured during the test, it shall be possible to confirm that they have complied with their respective
standard values.

4．Test results
Test results shall be recorded in accordance with the form attached separately.

5．Photographic records(1) Common items
A blackboard or other similar item shall be used to describe the recorded items, when photographs are taken.
The items to be recorded shall refer to “Examples of recorded items “as below.
Examples of recorded items- Test item
- Date of test
- Dates and times of tests (at commencing and completion of the repetitive compression test, as well as the dateand time of static compression test)

- Specimen numbers and types, hardness of the rubber, and sizes (L × H)
- Inspection company name (for witnessing, refer to Table 3 Items to be included in photographic records)(2) Items for individual inspection and test
Table 3. Items to be included in photographic records
Test and inspection

Timing of photographing

Items to be included in photographs

During appearance inspection (forActual inspection operations, witnessing

Appearance and size

each specimen)

inspector(s), and blackboard

inspection

During size inspection (for each

Actual inspection operations, witnessingspecimen)

inspector(s), and blackboard

Static compression

During compression test (for eachActual test operations, witnessing inspector(s),test (before and afterspecimen)

and blackboard

repetitive

During temperature measuring on

Actual test operations, witnessing inspector(s),compression test)

specimen

and blackboard

During measurement of residual

Actual measurement operations, witnessing

deflection (for each specimen)

inspector(s), and blackboard

During check of operation (for each

Actual checking operations, (witnessingspecimen)

inspector(s)), and blackboard

During measurement of thetemperature on the specimens (forActual measurement operations, (witnessingeach specimen) before and after theinspector(s)), and blackboardtest
Repetitive

During repetitive compression test

Actual test operations, (witnessing

compression test(for each specimen)*1

inspector(s)), and blackboard*2

Installation of thermometer formeasuring the ambient temperature(for each specimen)

Actual measurement of the distance between
the surfaces of the specimens and thethermometer, (witnessing inspector(s)), andblackboard

During visual inspection ofActual checking operations, witnessing

appearance (for each specimen)

inspector(s), and blackboard

During checking of the specimens (for Actual checking operations, witnessing
each specimen)

inspector(s), and blackboard

During tensile, elongation, andhardness tests (before and after heat

Actual test operations and blackboardaging) (for each specimen)
Rubber physical test

During heat aging test (for eachspecimen)
During ozone resistance test (for eachspecimen)

Actual heat aging operations and blackboard
Ozone exposure tester and blackboard

During checking of crack (for each

Actual checking operations, witnessingspecimen)

inspector(s), and blackboard

*1 Take photographs at the start and completion of the repetitive compression test.
*2 The witnessing inspector is not required to stay throughout the repetitive compression test. However, it isnecessary to take photograph(s) that show an inspector is actually witnessing the test.
*3 Items marked in parentheses by the attending inspector in the above table do not necessarily require theattending of the inspector.
Note Above is a translation of the Japanese original standard. The text in Japanese shall prevail in the interpretationof the standard.