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Natural rubber grades with their impurities content [109].
| Impurities | SMR-L | SMR-5 | SMR-10 | SMR-20 |
|---|---|---|---|---|
| Dirt (max) wt.% | 0.02 | 0.05–0.08 | 0.08 | 0.16 |
| Ash (max) wt.% | 0.50 | 0.60–0.75 | 0.75 | 1.00 |
| Nitrogen (max) wt.% | 0.60 | 0.60 | 0.60 | 0.60 |
| Volatile matter (max) wt.% | 0.50 | 0.80 | 0.80 | 0.80 |
