| BF | Blast furnace |
| CDA | Cow dung ash |
| COF | Coefficient of friction |
| FA | Fly ash |
| HDPE | High-density polyethylene |
| LD | Linz–Donawitz |
| PA | Polyamide |
| PE | Polyethylene |
| PEEK | Polyether ether ketone |
| PP | Polypropylene |
| PTFE | Polytetrafluoroethylene |
| RM | Red mud |
| RHA | Rice husk ash |
| WTD | Waste tire dust |
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