Apparent and physical character

A.    Apparent character

·          Tolerance in diameter is –0/+1.0 mm for each ball.

·           The sizes of all the bubble in each ball are similar. The bubbles are grown equally in a whole ball.

·          The diameter of the hole is less than 2mm. And the number of the holes in a ball is less than 2.


 

B.     Physical character

1

Rubber content

=>70% 

2

Specific density in dry state

=<0.5

3

Specific density in wet state

1.0~1.2

4

Ball diameter increase, in water of 60 ºC for 24 hours

5%

5

Rubber tensile strength

  =>16 Mpa/cm2

6

Elongation at break

 =>500%

7

Rubber hardness

50~65 sh

8

Rubber elongation strength

 =>6 Mpa/cm2

9

Aging coefficient

 =>0.8

10

Relative compression ratio

30~50%

11

Permanent deformation

 =<10%
 
 
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