Rubber ProductsThe Plantation Corporation of Kerala Ltd.
TSR Factory
Producing the Indian Standard Natural Rubber (ISNR) which is the technical name for Block Rubber (TSR) in India. Natural rubber processed as per the technical specifications notified by the International Standards Organization (ISO). In India, block rubber is marketed with ISI specification, IS 4588 and therefore termed as 'Indian Standard Natural Rubber' (ISNR).
This marketable form of natural rubber, is produced from Latex, Cup Lumps or Field Coagulum. The bales are marketed in bales wrapped in compact polyethylene (LDPE), the contamination of rubber on storage, holding and transportation are fully eliminated. The standard size of the bales and its compact packaging enables mechanized handling and containerization, thereby making the transportation economical and trouble free.
Bureau of Indian Standards (BIS) formulated specifications for ISNR in 1969 (IS 4588). IS 4588 prescribes 6 grades viz., ISNR 3 CV, ISNR 3 L, ISNR 5, ISNR 10, ISNR 20 and ISNR 50.
Our Products
Our product range includes;
- ISNR 5 (from Latex Coagulum, Un dried Sheets)
- ISNR 10 (from Latex Coagulum, Cup lumps)
- ISNR 20 (Field Coagulum)
Our Quality Descriptions
ISNR -10 and ISNR -20 Produced in TSR factory is obtained by blending the rubber scraps received from Kalady group, Kodumon Estates, Perambra Estates and Nilambur Estate in appropriate proportion by initially testing the plasticity and other parameters of unprocessed rubber (blanket rubber).
Blending of rubber scraps from different estates is alone in accordance with the values (Quality parameters) obtained by testing unprocessed rubber each month.
Quality parameters of ISNR-20 are as follows
| PARAMETERS |
RANGE OF ISNR-20 |
BIS SPECIFICATION FOR ISNR -20 |
| Dirt content |
0.11-0.16 |
Max 0.20 |
| Volatile matter |
0.38-0.63 |
Max 0.80 |
| Ash content |
0.26-0.58 |
Max 1.00 |
| Nitrogen content |
0.28-0.33 |
Max 0.60 |
| Po |
31-43 |
Min 30 |
| PRI |
41-60 |
Min 40 |
Quality parameters of ISNR-10 are as follows
| PARAMETERS |
RANGE OF ISNR-20 |
BIS SPECIFICATION FOR ISNR -10 |
| Dirt content |
0.065-0.091 |
Max 0.1 |
| Volatile matter |
0.32-0.58 |
Max 0.80 |
| Ash content |
0.12-0.45 |
Max 0.75 |
| Nitrogen content |
0.28-0.33 |
Max 0.60 |
| Po |
35-45 |
Min 30 |
| PRI |
55-74 |
Min 50 |
Quality parameters of ISNR-5 are as follows
| PARAMETERS |
BIS SPECIFICATION FOR ISNR -5 |
| Dirt content |
0.05 |
| Volatile matter |
0.80 |
| Ash content |
0.60 |
| Nitrogen content |
0.60 |
| Po |
30 |
| PRI |
60 |
