Marine Dock Fenders Specification

Physical Properties of Rubber Compound

Test Item

Properties

Test Method

Similiar Standards

Before ageing

Tensile strength

160kg/cm2

JIS K6301 - 1975 dumbel#3

ISO37
ASTM D412
BS903 A2

Elongation

350% min.

Hardness

72° max.

JIS K6301 - 1975
Spring type hardness (Type A)

ISO2783
ASTM D2240
BS903 A26

After ageing

Tensile strenght

Not less than 80% of original valve.

JIS K6301 - 1975
Ageing test through air heating
70 ± 1° C X 96 hours

ISO 188
ASTM D573
BS903 A19

Elongation

Hardness

Original valve +8° max.

Compression set

30% max.

JIS K6301 - 1975
Heat treatment
70 ± 1° C X 22 hours

ASTM D395
BS903 A6

Ozone Resistance

No Crack

JIS K6251 - 1993
50pphm X 40° C X 48 hours
(Elongation = 20%)

ASTM D1149
BS903 A43

Test Result by ASTM

Test Item

Test Result

Test Method

Before ageing

Tensile strength

188kg/cm2

ASTM D412

Elongation

420%

Hardness

70°

ASTM D2240

Compression set

14%

ASTM D395
70 ± 1° C X 22 hours 25% compression

Tear resistance

94 kg/cm

ASTM D624 (DIE B)

After ageing

Change in tensile strength

103.7%

ASTM D573
gear type
70 ± 1° C X 96 hours

Change in elongation

83.8%

Hardness

+5°