Introduction: What Is Rulon?
Rulon is a family of proprietary PTFE-based composite bearing materials engineered and manufactured by Saint-Gobain Performance Plastics. Widely recognized as the gold standard in self-lubricating bearing solutions, Rulon combines the inherent low-friction properties of polytetrafluoroethylene (PTFE) with carefully engineered fillers — such as glass fibers, bronze, carbon, and proprietary blends — to create materials that outperform plain PTFE in virtually every mechanical application.
The result is a bearing material that operates without external lubrication, tolerates extreme temperatures, resists aggressive chemicals, and dramatically extends service intervals. At Emco Industrial Plastics, we stock a comprehensive range of Rulon grades in rod, sheet, and tube form — and machine custom parts to your exact specifications.
"Rulon's self-lubricating composite structure eliminates the need for grease or oil entirely — making it the go-to choice wherever contamination, maintenance access, or cleanliness are concerns."
The Material Science Behind Rulon
Pure PTFE has an exceptionally low coefficient of friction (~0.05–0.10), but it suffers from poor creep resistance, low compressive strength, and high wear rates under load. Rulon solves these limitations by blending PTFE with reinforcing fillers that dramatically improve load-bearing capacity and dimensional stability without sacrificing the natural lubricity that makes PTFE so valuable.
The filler composition varies by grade and is precisely controlled to achieve specific property targets — whether that's extreme chemical resistance (Rulon J), FDA compliance for food contact (Rulon LR), or high-speed low-wear performance (Rulon 641). This engineered tailoring is what separates Rulon from commodity filled-PTFE materials.
When Rulon slides against a mating surface, it deposits an ultra-thin transfer film of PTFE onto the counterface. This self-generated film maintains lubrication throughout the bearing's life — even in the absence of any external lubricant supply.
Key Benefits of Rulon Composite Bearings
- Self-lubricating — no grease or oil required
- Wide temperature range (cryogenic to 260°C+)
- Excellent chemical resistance
- FDA-compliant grades available
- Low coefficient of friction (0.05–0.20)
- Electrically insulating options
- Reduces noise, vibration & wear
- Dimensionally stable under load
- Lightweight vs. metal bearings
- Machinable to tight tolerances
Rulon Grade Comparison Guide
Saint-Gobain produces dozens of Rulon grades. Below are the most commonly specified in industrial, food processing, medical, and precision equipment applications. Emco Industrial Plastics stocks the full range and can advise on the right selection for your operating conditions.
| Grade | Key Filler | Temp. Range | Best For | Certifications |
|---|---|---|---|---|
| Rulon J | Proprietary blend | -200°C to 260°C | Chemical resistance, general purpose; gentle on soft mating surfaces | FDA, USP Class VI |
| Rulon LR | Low-friction blend | -200°C to 260°C | Food & beverage, pharmaceutical, cleanroom | FDA 21 CFR, NSF |
| Rulon 641 | Fiberglass | -200°C to 260°C | High load, high speed, hydraulic cylinders, aerospace | — |
| Rulon 142 | Carbon/graphite | -200°C to 260°C | Electrically conductive applications, anti-static | — |
| Rulon AR | Aromatic filler | -200°C to 260°C | Corrosive environments, chemical processing | — |
| Rulon XT | Advanced composite | -200°C to 260°C | Extreme wear resistance, semiconductor equipment | — |
Common Applications by Industry
Rulon bearings appear across an impressive range of industries wherever lubrication-free, long-life, and contamination-free operation is required:
Food & Beverage Processing: Rulon LR and Rulon J are the natural choice for conveyor guides, packaging machinery, and filling equipment where FDA compliance and washdown resistance are mandatory. Eliminating grease prevents contamination risks and reduces cleaning downtime.
Medical & Pharmaceutical: With USP Class VI and FDA certifications, Rulon grades are used in surgical instruments, MRI equipment, infusion pumps, and cleanroom automation — anywhere that particle generation, sterilizability, and biocompatibility are critical.
Aerospace & Defense: Rulon 641's superior load capacity and wide operating temperature range make it a proven material for aircraft control surface bearings, landing gear components, and actuator rod seals.
Hydraulic & Pneumatic Cylinders: As a piston and rod seal/bearing material, Rulon reduces stick-slip, extends seal life, and eliminates the risk of oil contamination in hydraulic systems.
Semiconductor & Electronics: Rulon XT and select grades meet the ultra-clean, particle-minimizing, and chemical-resistant demands of wafer handling, vacuum environments, and lithography equipment.
Rulon vs. Alternative Bearing Materials
Engineers often evaluate Rulon against bronze bushings, Igus iglide® polymers, Turcite® (Slydring), and plain PTFE. Here's the key differentiator: Rulon's proprietary compounding process consistently delivers lower, more stable coefficients of friction and superior wear rates compared to commodity filled-PTFE or generic engineered polymer bearings — particularly under combined load and oscillating motion.
Bronze offers higher load capacity but requires lubrication, is susceptible to corrosion, and is significantly heavier. Igus materials are cost-competitive but generally offer higher friction and may not meet FDA or medical-grade requirements. Plain PTFE creeps under load and wears rapidly without fillers.
For demanding applications where the cost of downtime, contamination, or premature bearing failure is high, Rulon is the technically superior and often the lower total-cost solution.
Not Sure Which Rulon Grade Is Right for Your Application?
Emco Industrial Plastics' technical team can help you select the correct grade based on your load, speed, temperature, chemical exposure, and regulatory requirements. We stock Rulon in sheet, rod, and tube — and offer precision machining to finished dimensions.
Talk to a Materials Expert →Working with Rulon: Machining & Design Tips
Rulon machines readily on conventional equipment with carbide tooling. Sharp tools and light finishing cuts minimize surface roughness and optimise the transfer film formation. Avoid excessive heat buildup — PTFE composites have high thermal expansion coefficients compared to metals, and running dimensions should account for thermal growth in service.
For bearing bores, a light press-fit or adhesive retention is generally preferred over relying on the bearing's own friction, as PTFE composites have low surface energy. Emco can machine Rulon parts to print tolerances and advise on housing fits for your specific application.
Conclusion
Rulon material represents decades of engineered refinement in PTFE composite technology. Its combination of self-lubrication, chemical resistance, broad temperature tolerance, and regulatory compliance makes it one of the most versatile and reliable bearing materials available to design engineers today.
Whether you're specifying bearings for a food processing line, a hydraulic actuator, a medical device, or an aerospace assembly, there's almost certainly a Rulon grade optimized for your conditions. Emco Industrial Plastics is your Canadian source for Rulon stock shapes and precision-machined components — with the technical expertise to help you get it right the first time.