Astlett Rubber Inc.

 
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Rubber Materials
Natural Rubber
Specialty NR Grades
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Carbon Black

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TSR 20
Natural Rubber Comparison Chart

 
Parameter

Unit

SIR
20

SIR
20VK

SMR
20

SMR
20CV

STR
20

STR
20CV

SVR
20

Dirt (max)

% wt

0.20
0.20
0.16
0.16
0.16
0.16
0.16

Ash (max)

% wt

1.00
1.00
1.00
1.00
0.80
0.80
1.00

Nitrogen (max)

% wt

0.60
0.60
0.60
0.60
0.60
0.60
0.60

Volatile Matter (max)

% wt

0.80
0.80
0.80
0.80
0.80
0.80
0.80
Po (min)  
30
30
30
NA
30
NA
30
PRI index (min)  
50
50
40
40
40
40
40
Mooney Viscosity
(ML, 1+4, 100C)
 
NA
60
+/- 5*
NA
65
+7/-5*
NA
65
+7/-5*
NA

*Not specification status, but are controlled at the producer end.

These figures are limits, not typical values. Typical values will vary by producer.

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