Most belt specifications say “PVC” because the last line used PVC. That is a reasonable default for light assembly, but it is the wrong answer for oily parts, hot parts, food contact or static-sensitive electronics. The five conditions below decide the material before price does.
Key takeaways
- PVC is the general-purpose choice; PU is better for oil, abrasion and cut resistance.
- Food-grade belting is a certification and a construction, not a colour.
- ESD belting needs a continuous conductive path, not just a dark surface.
- Temperature limits are continuous, not peak; a hot part can exceed the belt rating locally.
1. Temperature
Standard PVC belting is comfortable from about −10 °C to +70 °C. PU handles roughly −20 °C to +80 °C, with special grades higher. Above 80 °C, rubber or silicone belts are usually required, and the conveyor frame and bearings must be specified for the same temperature.
The important distinction is continuous versus peak. A belt that sees a 120 °C part for five seconds may survive if the belt is thick and the contact is brief, but the surface will harden over time and the splice will fail first. If the process is hot, say so at the specification stage.
2. Oil and chemicals
PVC swells and softens when exposed to many oils and solvents. PU resists oils and greases much better and is the usual choice for machined parts, automotive components and anything with cutting fluid. For aggressive chemicals, check the manufacturer's resistance table for the specific fluid and concentration; “oil resistant” is not a specification.
3. Abrasion and cut resistance
PU has higher tear and cut resistance than PVC. On a line handling sharp-edged stampings, castings or glass, a PU belt with a fabric backing will last longer than a standard PVC belt. The extra cost is usually recovered in belt changes. For very abrasive bulk materials, a rubber belt with a fabric carcass is more appropriate than either.
| Condition | PVC | PU | Food grade | ESD |
|---|---|---|---|---|
| Continuous temperature | −10 to 70 °C | −20 to 80 °C | −10 to 70 °C | −10 to 60 °C |
| Oil resistance | Poor | Good | Depends on grade | Fair |
| Abrasion resistance | Fair | Good | Fair | Fair |
| Cleanability | Good | Good | Excellent | Good |
| Static control | No | No | No | Yes, with grounding |
| Relative cost | Low | Medium | High | High |
4. Cleaning and food contact
Food-grade belting must meet the relevant contact standard and be constructed so that it can be cleaned. A white belt is not automatically food grade. Look for the certification, the material declaration and a splice that does not trap residue.
In wet or washdown areas, the belt edge and the splice are the critical details. An open fabric edge absorbs water and bacteria. A sealed edge or a moulded splice is easier to clean. The frame should drain, and the belt should be supported so that water does not pool on the carry side.
5. Static control
Electronics assembly needs a belt that dissipates static, not one that insulates. ESD belting is made conductive or dissipative and must be grounded through the frame at both ends. A conductive belt on an insulated frame does nothing. Check surface resistance with a meter after installation, and include the belt in the periodic ESD audit.
Belt construction matters as much as the compound
Two belts with the same top cover can behave differently because of the carcass. A belt with a polyester fabric carcass stretches less and tracks better than a belt with a weak carcass. A belt with a high-friction bottom cover grips the pulleys better but uses more power. A belt with a low-friction bottom cover slides more easily but may slip under load.
For a conveyor with a small pulley diameter, choose a thin belt with a flexible carcass. For a conveyor with a long centre distance, choose a low-stretch carcass and a proper take-up. The compound is only one part of the specification.
How to decide quickly
If the product is dry, light and at room temperature, PVC is usually fine. If there is oil, sharp edges or a need for better abrasion resistance, move to PU. If the product touches food or pharmaceutical packaging, use a certified food-grade belt and design for cleaning. If the product is electronic, use ESD belting and ground the frame. If the temperature is above 80 °C, stop and reconsider the conveyor type before choosing a belt.
Frequently asked questions
Can I use a food-grade belt on a non-food line?
Yes, but it is usually more expensive than necessary. Food-grade belting is chosen for compliance and cleanability, not for mechanical performance.
How often should conveyor belts be replaced?
Inspect monthly for cracks, edge wear and splice condition. Replace when the belt is stretched beyond the take-up range, the splice is failing repeatedly, or the surface is damaged enough to affect product handling.
Is a PU belt suitable for a wet area?
PU handles water better than PVC in some grades, but the splice and edge construction matter more than the compound. Use a sealed-edge belt and a frame that drains.
Send the product, temperature and cleaning method to our team through the contact page, and we will specify the belt, splice and frame finish together. Our belt conveyor page lists the frame options.
