6o 
Table II . — Tests on Vulcanised Plantation Rubbers. 
Vulcanisa- 
tion 
reference 
number. 
48 
49 
62 
74 
77 
79 
80 
83 
85 
87 
99 
104 
92 
94 
*43 
144 
101 
45 
139 
no 
Q 
R 
1)2 
K 
Sulphur, 
per cent 
X 
5 
8 
Mean of all tests 
Mean of L, Q, 
R, T, and D2 
Table III.- 
Tensile 
strength, 
in grms. 
Elongation 
at rupture 
when original 
= I ’ O . 
3*29 
) 
— 
) 
- 
3574 
3278 
* 3*4 
X3‘° 
87 
3*33 
) 
127 
J 
8 -o ) 
2882 
| 
* 3*9 
— 
30 x 5 
2910 
2927 
[2933 
) 
* 3*3 
13*2 
I 3' I J 
X 3-4 
9*4 1 
9*4 [ 
10 * 2 / 
3*64 
1 
i 2 * 4 l 
! 
8-2 
3263 
^3264 
i 2 ' 4 ; 
► 12*5 
8 *o 
3366 . 
1 
127I 
1 
9 * 5 ; 
3320 
) 
i 3 ' 3 l 
8 * 5 ) 
3168 
1-3349 
12*5 | 
12*9 
8*2 
34991 
* 3 ’i I 
7*9 [ 
34 *oJ 
1 
I2*9J 
1 
8’2 J 
3260 
2981 ; 
3120 
i 3‘4 
* 3 * 4 J 
-13*4 
10 * 2 ) 
io*6J 
3x38' 
*37 
10*4 
3428 
3245 
i 4*3 
14*0 
9*5 
31691 
i 3 * 9 J 
I0 * 4 , 
3324 
3324 
12*0 
12*0 
77 
3203 
I3'I 
9-0 
3187 
13*0 
8-9 
Tests on 
Vulcanised hard cure Para. 
Elongation 
under a strain 
of 1,500 grms 
when original 
= 10. 
8-3 
97 
8-9 
8*2 
• 10*4 
10*1 
77 
Vulcanisa- 
tion Sulphur, 
reference per cent, 
number 
Tensile 
strength, 
in grms 
Elongation 
at rupture 
when original 
= 10. 
Elongation 
under a strain 
of 1,500 grms. 
when original 
= x.o. 
95 
97 
U 
6 
2788' 
354 IJ 
[3164 
12*2 
12*8 
•12*5 
9 * 2 ) 
8*3 J 
n 4 
Y 
2646] 
2808 
13*3 
12*8 
10*1 
IT 5 
6 
2970 j 
12*4 
9*8 J 
124 
S 
6 
3118 3118 
12*9 
12*9 
9*3 
Mean of all tests 
3013 
12*7 
9*3 
given above). After washing and drying, the mixing and vulcanisation 
of the samples was carried out in exactly the same manner as with the 
plantation rubber. The results of the tests are given in Table III. 
It will be seen that the average tensile strength of five vulcanisa- 
tions, comprising three mixings, in all of which 6 per cent, sulphur was 
used, averages 30*3 S rms * an< 3 the elongation 12*7* Roth figures are 
somewhat lower than those obtained with the plantation rubber. The 
figures, too, are more irregular. It is far from our intention to draw 
