HSD viscosity index improver
Time：
2025-11-08
HSD viscosity index improver
Hydrogenated styrene-diene copolymer viscosity index improver (HSD) generally refers to hydrogenated styrene-isoprene/butadiene copolymer, the structure of which is shown below:
During the production of HSD, random, block, and star copolymers can be obtained by using different processes. The relative molecular mass of HSD viscosity index improvers is between 5,000 and 100,000. They have good thickening ability and shear stability, similar to ethylene-propylene copolymers, but their low-temperature performance and thermal stability are poor.
| ITEM | OCP(product page) | HSD(product page) |
| Thickening ability | Good | Medium |
| Shear stability | Medium | Good |
| Thermal oxidation stability | Medium | Medium |
| Low-temperature viscosity | Poor | Good |
| Low-temperature pumpability | Poor | Medium |
| High-temperature shear viscosity | Good | Poor |
| VI Improvement Capability | Medium | Medium |
| Economy | Good | Medium |
| Use | Engine oil | Wide usage |
CheMost manufactures and supplies HSD viscosity index improvers. Contact us.
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