| RPUF | rigid polyurethane foam |
| REF | reference sample |
| MEL | melamine |
| EG | expanded graphite |
| APP | ammonium polyphosphate |
| TGA | thermogravimetric analysis |
| UL-94 | Underwriters Laboratories 94 |
| LOI | limiting oxygen index |
| FR | flame retardant |
| HRR | heat release rate |
| pHRR | peak heat release rate |
| EHC | effective heat of combustion |
| THR | total heat release |
| TTF | time to flameout |
| TTI | time to ignition |
| PLM | percentage mass loss |
| MLR | mass loss rate |
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