IS 4588-1986 Specification For Raw Natural Rubber ( Third Division) PHYSICAL & CHEMICAL REQUIREMENT FOR NATURAL RUBBERS
| NO | PARTICULERS | ISNR 3CV | ISNR 3L | ISNR 5 | ISNR 10 | ISNR 20 | ISNR 50 | METOD OF TEST |
|---|---|---|---|---|---|---|---|---|
| 1 | Dirt Content, % (Max) | 0.03 | 0.03 | 0.05 | 0.10 | 0.20 | 0.50 | NR: 1 is 3660 (PART I ) 1972 |
| 1 | Volatile Mattr , % (Max) | 0.80 | 0.80 | 0.80 | 0.80 | 0.80 | 0.80 | NR: 2 of IS 3660 (part I) -1972 |
| 3 | Ash Content, % (Max) | 0.50 | 0.50 | 0.50 | 0.75 | 1.00 | 1.50 | NR: 3 of IS 3660 (part I) - 1972 |
| 4 | Nitrogen content, % (max) |
0.60 | 0.60 | 0.60 | 0.60 | 0.60 | 0.60 | NR: 11 of IS 3660 (part II) - 1968 |
| 5 | Initial Plasticity (po) (minimum) |
40 | 30 | 30 | 30 | 30 | 30 | NR: 12 of IS 3660 (part III) -1971 |
| 6 | Plasticity Retention (Index (PRT) (minimum) |
60 | 60 | 60 | 50 | 40 | 30 | NR: 13 of IS 3660 (part III) -1971 |
| 7 | Color (lovibond scale) (max) |
- | 6.00 | - | - | - | - | NR: 14 of IS 3660 (part IV) - 1979 |