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The model hydrogenated nitrile butadiene rubber (HNBR) grades and their CB contents.
| Grade | Content 1 | Content 2 |
|---|---|---|
| HNBR1 | large size (10 phr) | middle size (75 phr) |
| HNBR2 | large size (75 phr) | middle size (10 phr) |
| HNBR3 | large size (40 phr) | middle size (45 phr) |
| HNBR4 | large size (10 phr) | small size (75 phr) |
