Rubber vs Polyurethane vs Silicone Rollers: How to Choose
Short answer: pick rubber for grip and general nipping up to 100–120 °C, polyurethane for load, abrasion and cut resistance up to 80–90 °C, and silicone for heat and release up to 250 °C. When a roller fails early, changing the cover material nearly always fixes it — changing the hardness rarely does.
The Four Covers Compared on the Properties That Decide Failure
Every roller failure traces back to one of four things: heat, chemical attack, abrasion, or the wrong amount of grip. This is how the covers we build line up against them.
| Cover | Grip | Abrasion | Heat | Oils / solvents | Typical use |
|---|---|---|---|---|---|
| Rubber (NBR / EPDM) | High | Moderate | to 100–120 °C | Good (NBR) / poor (EPDM) | Nip, feed and pressure positions |
| Polyurethane (PU) | High | Very high | to 80–90 °C | Good, not for strong solvents | High load, cut-resistant, long life |
| Silicone | Low–moderate | Low | to 250 °C | Poor | Heat, release, non-stick contact |
| Steel / chrome | None | Excellent | Unlimited | Excellent | Coating, drying, idler positions |
If the roller you are replacing failed early through heat, chemical attack or abrasion, changing material usually solves it — changing hardness rarely does. Read the hardness guide →
When Rubber Is the Right Answer
Rubber is the default for a reason: it grips, it conforms, and it forgives imperfect alignment. The question is never “rubber or not” — it is which compound.
| Compound | Hardness | Heat resistance | Resists | Avoid when |
|---|---|---|---|---|
| NBR (nitrile) | 30–90 Shore A | to 100 °C / 212 °F | Oils, greases, hydraulic fluid | Strong ozone, sunlight, ketones |
| EPDM | 40–90 Shore A | to 120 °C / 248 °F | Ozone, water, steam, weather | Mineral oils and solvents |
| SBR | 40–90 Shore A | to 80 °C / 176 °F | Abrasion, general wear | Oil contact, high heat |
| Neoprene (CR) | 40–85 Shore A | to 110 °C / 230 °F | Moderate oil, weather, flame | Strong solvents, high heat |
| Silicone | 30–80 Shore A | to 250 °C / 482 °F | Heat, release, sticking | Abrasion, oil, high load |
NBR is the safe choice wherever oil or grease is in the picture. EPDM takes over when the enemy is steam, weather or ozone rather than oil — and fails quickly if you put it in mineral oil. SBR is the low-cost general wear compound. Neoprene covers moderate oil plus weather and flame resistance in one compound.
Food contact, static dissipation, low-temperature service and solvent-heavy duty each need their own compound rather than a compromise. Flag it in the enquiry and we quote the right one.
When Polyurethane Outlasts Rubber
Polyurethane carries more load than rubber at the same hardness, resists abrasion and cutting, and holds its shape under pressure. Where the nip is aggressive, it routinely outlasts rubber several times over.
We cast PU from 60 Shore A to 70 Shore D, which is a far wider window than rubber covers. That range is what lets one material serve both a soft conforming feed roller and a hard, high-load drive roller.
Where PU is the wrong choice: heat above 80 °C, contact with strong solvents, and very soft conforming nips below 40 Shore A. Polyurethane also generates internal heat under high-frequency cyclic loading, and some grades degrade in hot humid conditions — worth knowing if the roller runs fast in a humid plant.
If your current rubber roller is being cut, chunked or worn flat rather than hardened, PU is usually the first thing to try. See the PU roller range →
When Only Silicone Survives
At drying and baking temperatures a rubber cover hardens, glazes and starts to mark the web. Silicone keeps its release properties where rubber has already given up.
Silicone runs to 250 °C / 482 °F continuous as standard, with peak temperatures quoted per compound. Above that the cover ages faster regardless of grade, so quote against the real surface temperature rather than the oven setpoint — the two are rarely the same number.
Silicone is not a general-purpose cover. It has low abrasion resistance, poor oil and solvent resistance, and low grip. It is the answer for heat, release, and non-stick contact — not for a loaded nip.
If the position is both hot and loaded, tell us the duty cycle. The answer is not always silicone; sometimes it is a different compound with a heat-rated core design.
Four Questions That Settle It
In practice, buyers narrow the cover down in about two minutes by answering these in order.
| Question | If the answer is… | Go to |
|---|---|---|
| 1. What temperature does the cover actually see? | Above 120 °C | Silicone |
| 2. Is there oil, solvent or steam at the nip? | Oil or grease → NBR; steam or weather → EPDM | Rubber |
| 3. How did the last roller fail? | Cut, chunked or worn flat | Polyurethane |
| 4. Does the position need grip or release? | Release, non-stick, hot web | Silicone or chrome |
If you cannot measure the surface temperature, measure the roller you are replacing instead: a glazed, cracked or hardened cover points at heat, and a swollen or softened one points at chemical attack.
Roller Cover Questions
Can I switch from rubber to polyurethane on the same machine?
Usually yes, and it is the most common upgrade we quote. Check two things first: surface temperature stays under 80 °C, and the position does not need a very soft nip below 40 Shore A. If the drive torque or nip loading was marginal with rubber, tell us — a harder PU cover can increase the load on the drive.
Is silicone always the right answer for high heat?
No. Silicone is the answer for heat combined with release and low load. A hot position that is also loaded and abrasive can fail faster in silicone than in a heat-rated rubber compound. Send the temperature, the load and the duty cycle and we will tell you which one we would build.
Which hardness should I pair with each cover?
Hardness and cover are independent decisions: pick the cover for the environment, then the hardness for the nip. Start from the hardness of the roller you are replacing — the hardness guide gives the ranges by position.
Do you build all three covers on customer-supplied cores?
Yes. Send the cores and we inspect, machine if needed, cover, grind and balance. If the journals are out of tolerance we will tell you before starting rather than after.
What if two of my positions need different covers?
That is normal, especially on printing and coating lines where a hot position sits next to a loaded one. Order per position rather than as a set — see how we handle it on printing rollers, where hardness is specified per position across a unit.
Not Sure Which Cover? Send the Failure, Not Just the Drawing
Photos of the worn roller, the running temperature and what contacts the cover are usually enough for a recommendation. You get a material proposal, a hardness proposal, a firm price and a delivery date — usually within one business day.