A Natural Rubber Testing and Certification Laboratory Authorised By MRB

SMR SPECIFICATION SCHEME
SMR SPECIFICATION SCHEME
Mandatory From 01 Oct 1991
.
 Parameter
 Dirt (max) % wt
 Ash (max)% wt
 N2 (max) % wt
 VM (max) % wt
 P0 (min)
 PRI (min) %
 WASHT (max)
 VR  
 Colour (max)
 Rheometric Cure
SMR GRADE
SMR
10
SMR
20
SMR
10CV
SMR
20CV
SMR
CV50
SMR
CV60
SMR
L
SMR
5
SMR
GP
0.08 0.16 0.08 0.16
0.75 1.00 0.75 1.00
0.60 0.60 0.60 0.60
0.80 0.80 0.80 0.80
30 30 NA NA
50 40 50 40
NA NA 8 8
NA NA 55-67* 60-72*
NA NA NA NA
N N Y Y
0.02 0.02 0.02
0.50 0.50 0.50
0.60 0.60 0.60
0.80 0.80 0.80
NA NA 35
60 60 60
8 8 NA
50+/-5 60+/-5 NA
NA NA 6.0
Y Y N
0.05
0.60
0.60
0.80
30
60
NA
NA
NA
N
0.08
0.75
0.60
0.80
NA
50
8
60-72
NA
Y


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



MATERIAL COMPOSITION OF SMR GRADES

GRADE
MATERIAL
SMR 10, SMR20, SMR 10CV, SMR 20CV
SMR CV50, SMR CV60, SMR L
.
SMR 5
.
SMR 5RSS
SMR 5ADS
SMRGP
Field grade material
Whole field latex bulked and acid coagulated under controlled conditions.
Sheet material (RSS, ADS, Uss or mixture) subjected to further crumb processing.
Direct baling of RSS.
Direct baling of ADS
60% latex/sheet material; 40% cup lump.

Cup lump or field coagulum is rubber naturally coagulated in the tapping cup or other suitable vessel.
Field grade material consists of cup lump or field coagulum with a minor proportion of latex/sheet material.



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