Polyurethane Skirtboard
The highest abrasion resistance of any skirtboard material — 3-5x longer service life than rubber in heavy-duty conveyor applications.
What Is Polyurethane Skirtboard?
Polyurethane skirtboard is a high-performance sealing material used along the edges of conveyor belt loading zones and transfer points. Manufactured from cast or extruded polyurethane (PU) elastomer, it is engineered specifically for environments where standard rubber skirtboard wears out too quickly to be cost-effective.
The material is typically rated between 85 and 95 Shore A hardness — significantly firmer than natural rubber skirtboard, which falls in the 40-65A range. This increased hardness gives polyurethane its defining characteristic: exceptional resistance to abrasive wear. Fine particulates, crushed rock, sand, gravel, and mineral ores that rapidly erode rubber will wear through polyurethane at a fraction of the rate.
Polyurethane skirtboard is usually amber or clear in color, making it easy to distinguish from black rubber or orange skirtboard materials. It is available in the same standard widths and thicknesses as rubber skirtboard, allowing direct replacement in existing retaining clamp systems without modification.
Key properties of polyurethane skirtboard include:
- Abrasion resistance — Outperforms rubber, UHMW, and most other elastomers in sliding abrasion tests
- Elastic memory — Returns to original shape after deflection, maintaining belt seal over time
- Cut and gouge resistance — Resists damage from sharp-edged material like crushed rock and slag
- Chemical resistance — Tolerates oils, greases, solvents, and many industrial chemicals better than natural rubber
- Low compression set — Maintains consistent sealing pressure across longer service intervals
Polyurethane vs Rubber Skirtboard
Choosing between polyurethane and rubber skirtboard comes down to your specific application. Rubber remains the right choice for many general-purpose conveyors. But in abrasive, high-volume operations, polyurethane delivers a dramatically lower total cost of ownership. Here is how the two materials compare across the properties that matter most.
| Property | Polyurethane Skirtboard | Rubber Skirtboard |
|---|---|---|
| Abrasion Resistance | Excellent — best-in-class for sliding abrasion | Good — adequate for moderate abrasion |
| Cut & Tear Resistance | Very high — resists gouging from sharp material | Moderate — vulnerable to cuts from sharp edges |
| Material Cost | 2-3x higher per linear foot | Lower initial cost |
| Service Life | 3-5x longer in abrasive applications | Standard baseline |
| Cost-Per-Ton Conveyed | Lowest in heavy-duty operations | Higher when frequent replacement is needed |
| Temperature Range | -20°F to 180°F | -40°F to 250°F (wider range) |
| Chemical Resistance | Excellent — resists oils, solvents, hydrocarbons | Good — varies by rubber compound |
| Hardness (Shore A) | 85-95A | 40-65A |
| Belt Wear | Slightly higher due to firmness — monitor belt cover | Gentle on belt covers |
| Best For | Mining, hard rock, high-tonnage, abrasive material | General-purpose, lower-abrasion applications |
If you are replacing rubber skirtboard every few weeks in a mining or aggregate application, switching to polyurethane will almost certainly reduce your total operating cost — even at 2-3x the material price. For lower-volume or less abrasive applications, standard rubber skirtboard remains the most cost-effective choice.
Applications for Polyurethane Skirtboard
Polyurethane skirtboard is purpose-built for the most demanding conveyor environments. If your operation involves abrasive material and high throughput, polyurethane is the material that will keep your conveyors sealed and your maintenance schedule manageable.
Mining Operations
Underground and surface mining conveyors handling ore, overburden, and processed material. Polyurethane resists the constant sliding abrasion that destroys rubber skirtboard in weeks.
Hard Rock & Aggregate
Crushing and screening circuits, quarry conveyors, and aggregate processing lines. Sharp-edged crushed stone and gravel are among the toughest materials on skirtboard — PU handles them.
High-Tonnage Transfer Points
Primary and secondary transfer stations moving 2,000+ TPH. Higher volume means faster wear, and polyurethane extends replacement intervals proportionally.
Replacing Rubber on Short Cycles
Any conveyor where you are swapping rubber skirtboard every 2-4 weeks. The math almost always favors polyurethane — less downtime, fewer changeouts, lower labor costs.
Polyurethane skirtboard is also used in cement plants, steel mills, coal handling facilities, and port terminals. Any conveyor where abrasive wear is the dominant failure mode is a candidate for a polyurethane upgrade. For conveyors handling lighter or non-abrasive materials, orange skirtboard or standard rubber may be more appropriate.
Polyurethane Skirtboard Specifications
Texas Belting stocks polyurethane skirtboard in the sizes most commonly used in mining, aggregate, and heavy industrial applications. Custom widths and thicknesses are available on request. All material ships from our Texas warehouse.
| Specification | Details |
|---|---|
| Material | Cast or extruded polyurethane elastomer |
| Shore A Hardness | 85A - 95A |
| Thickness | 1/4", 3/8", 1/2", 3/4", 1" |
| Standard Widths | 4", 6", 8", 10", 12" |
| Temperature Range | -20°F to 180°F (-29°C to 82°C) |
| Color | Amber / Clear (standard) |
| Abrasion Resistance | ASTM D4060 Taber: <25 mg loss (1000 cycles, H-18 wheel) |
| Tensile Strength | 4,000 - 7,000 PSI |
| Elongation at Break | 400 - 600% |
| Tear Strength (Die C) | 400 - 800 PLI |
| Compression Set | <25% (70 hrs @ 158°F) |
| Mounting | Standard skirtboard retaining clamp systems |
Need a specific durometer, width, or length? Contact Texas Belting — we can source or fabricate polyurethane skirtboard to your exact requirements. We also carry urethane belting and conveyor belt fasteners for complete conveyor maintenance support.
Frequently Asked Questions
How long does polyurethane skirtboard last compared to rubber?
Polyurethane skirtboard typically lasts 3 to 5 times longer than standard rubber skirtboard in abrasive applications. In mining operations handling hard rock and high-tonnage loads, rubber skirtboard may wear through in 2-4 weeks while polyurethane can last 3-6 months or longer under the same conditions. Actual service life depends on material type, belt speed, tonnage, and how well the skirtboard is adjusted.
What temperature range can polyurethane skirtboard handle?
Standard polyurethane skirtboard operates effectively from -20°F to 180°F (-29°C to 82°C). This covers the vast majority of conveyor environments. It is not recommended for applications involving sustained heat above 180°F — in those cases, rubber skirtboard rated to 250°F or higher may be a better option. For extreme temperature applications, contact Texas Belting for material recommendations.
Is polyurethane skirtboard worth the higher cost?
Yes, in abrasive and high-tonnage applications. While polyurethane costs 2-3x more per linear foot than rubber, its 3-5x longer service life delivers a significantly lower cost-per-ton of material conveyed. You also reduce downtime for changeouts, maintenance labor costs, and the safety risks associated with frequent skirtboard replacement in active mining and processing zones. For general-purpose conveyors with low abrasion, rubber remains more cost-effective.
Can polyurethane skirtboard be cut and installed the same way as rubber?
Polyurethane skirtboard can be cut with standard utility knives, band saws, or table saws, though it is firmer than rubber and may require slightly more effort. It installs into the same standard skirtboard retaining clamp systems — no special tools or mounting hardware are needed. If you are replacing rubber with polyurethane, the swap is straightforward with no modifications to your existing setup.