HTPB is a liquid synthetic rubber of Hydroxyl Terminated Poly Butadiene, which is the major binding component of the solid composite fuel
| Specification | Grade 1 | Grade 2 |
| Appearance | |
|
| Hydroxyl(mmol/g) | 0.65 ± 0.05 | 0.75 ± 0.05 |
| Viscosity@40˚C(Pa.s) | ≤ 5.0 | ≤ 3.5 |
| Water content(m/m) | ≤ 0.10 | ≤ 0.10 |
| Peroxide (ppm) | ≤ 500 | ≤ 500 |
| Molecular Weight | 3100 | 3100 |