Belt conveyors utilize a friction drive and accordingly, when power is applied to the drive system, one run of the belt will experience a higher tension than the other. The amount of slack side tension required to prevent slippage at the drive is a function of several constant factors amongst others is the coefficient of friction between the drive system. Below is a list of standard drive pulley friction factors from various design catalogues and standards.
| Friction Factor (Min) | Friction Factor (Max) | Description | Reference | |
|---|---|---|---|---|
| 0.25 | 0.25 | Rubber surfaced belt driving bare steel pulley | CEMA | |
| 0.35 | 0.35 | Rubber surfced belt driving rubeer lagged pulley surface | CEMA | |
| 0.2 | 0.2 | Bare pulley running in water | CMA | |
| 0.35 | 0.35 | dry lagged pulleys | CMA | |
| 0.8 | 0.8 | pulleys lagged with ceramics | CMA | |
| 0.25 | 0.25 | Bare Pulley | CEMA | |
| 0.35 | 0.35 | Lagged | CEMA | |
| 0.35 | 0.35 | Dry Lagged | CEMA | |
| 0.35 | 0.35 | Wet Lagged | CEMA | |
| 0.35 | 0.35 | Wet and Dirty Lagged | CEMA | |
| 0.35 | 0.35 | Bare Pulley | STEVENS ADAMSON | |
| 0.35 | 0.35 | Lagged | STEVENS ADAMSON | |
| 0.35 | 0.35 | Dry Lagged | STEVENS ADAMSON | |
| 0.35 | 0.35 | Wet Lagged | STEVENS ADAMSON | |
| 0.35 | 0.35 | Wet and Dirty Lagged | STEVENS ADAMSON | |
| 0.1 | 0.3 | Bare Pulley | BRIDGESTONE | |
| 0.35 | 0.35 | Dry Lagged | BRIDGESTONE | |
| 0.2 | 0.3 | Wet Lagged | BRIDGESTONE | |
| 0.2 | 0.2 | Wet and Dirty Lagged | BRIDGESTONE | |
| 0.6 | 0.6 | Dry Lagged | LINATEX | |
| 0.8 | 0.8 | Wet Lagged | LINATEX | |
| 0.4 | 0.4 | Wet and Dirty Lagged | LINATEX | |
| 0.4 | 0.45 | Dry Lagged | REMA TIP TOP | |
| 0.35 | 0.35 | Wet Lagged | REMA TIP TOP | |
| 0.25 | 0.3 | Wet and Dirty Lagged | REMA TIP TOP | |
| 0.5 | 0.5 | Dimpled Ceramic or equivalent hard material | CEMA |
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