Research Article
Properties and Applications of a New Chemical Grouting Material
Table 1
Performance comparison table of materials.
| | Material | Formula weight | Content of –NCO (%) | Viscosity (MPa·s) | Activity | Toxicity |
| | TDI | 174.16 | 48 | 2.44 | High | Strong | | MDI | 250.24 | 33.6 | 6.30 | Moderate | Moderate | | PAPI | 350∼420 | 28 | 100–250 | Mild | Low |
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