The numbers that follow the letters relate to either the durometer (solid) or the density (sponge). The letters that follow KSil™:
| AFS | Ministry of Defence spec AFS 1682A |
| BF | |
| BMS | Boeing spec BMS 1-60 |
| FDA | Food grade accreditation |
| FR | Flame Retardant |
| GP | General Purpose |
| HT | High Tear |
| IN | Industrial grade |
| LCH | Low Combustion Hazard |
| PL | Platinum Cure |
| QR | Quick Recovery (comp set) |
| TH | |
| THT | Thermal High Temperature |
| US | US specs (AA59588 for solid and AMS 3195, 3196 for sponge) |
| V-0 | Relates to UL94V0 |
| VA |