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Royalene 539 is used in automotive, hoses, mechanical goods, wire and cable applications.
Royalene 539 is formulated as an extrusion-oriented EPDM with high ethylene content, medium molecular weight distribution and high Mooney viscosity, providing excellent green strength and processability for extrusion and certain molded applications.
CAS number: 25038-36-2 — this is the common registry CAS used for ethylene/propylene/diene terpolymers (EPDM) corresponding to trade grades like Royalene 539.
EC / EINECS number: Commercial EPDM trade grades are typically handled as polymers in inventories; a discrete EC number is not always listed for a specific trade grade.
Chemical name / descriptor: Poly(ethylene-co-propylene-co-5-ethylidene-2-norbornene) or Bicyclo[2.2.1]hept-2-ene,5-ethylidene-, polymer with ethene and 1-propene (the polymer descriptor associated with CAS 25038-36-2).
Molecular formula / weight: As a polymer, Royalene 539 has no single small-molecule formula or single molecular weight; catalog/regulatory entries list repeat-unit based descriptors (e.g., monomer equivalents such as C₁₄H₂₂ per repeat unit and an approximate formula weight for a repeat unit ~190.3 g·mol⁻¹), but a polymer’s Mn/Mw vary by batch and are not quoted as a single number in typical product data sheets.
SYNONYMS:
Ethylene propylene diene terpolymer, EPDM, Ethylene-Propylene-Diene Monomer rubber, Ethylene/Propylene/Diene terpolymer, Poly(ethylene-co-propylene-co-5-ethylidene-2-norbornene), Bicyclo[2.2.1]hept-2-ene,5-ethylidene-, polymer with ethene and 1-propene, EPM rubber
Another noteworthy aspect is the low extractables profile of Royalene 539 materials.
Royalene 539 contains minimal low-molecular-weight fractions, which reduces blooming, improves contact cleanliness, and minimizes concerns in sensitive environments where leachables could affect performance.
This cleanliness is also beneficial in dense compounds where physical uniformity is required.
From a safety perspective, Royalene 539 behaves similarly to other solid EPDM elastomers.
Royalene 539 is chemically stable, non-reactive under normal use, and not classified as hazardous.
Royalene 539 is a highly extendable, ethylene propylene diene (EPDM) rubber with high ethylene content.
Royalene 539 contains a non-staining stabilizer.
Royalene 539 exhibits medium molecular weight distribution, excellent green strength and high mooney viscosity.
Royalene 539 is designed for processing by extrusion.
Royalene 539 is an EPDM grade designed for compounders who need strong performance in both processing and final cured properties.
USES and APPLICATIONS of ROYALENE 539:
Applications of Royalene 539: Automotive, Wire and Cable, Extruded Products, Impact Modifier, TPO Compounds, and Hose.
Royalene 539 is used in automotive, hoses, mechanical goods, wire and cable applications.
Royalene 539 complies with FDA 21 CFR 177.2600 regulation.
Royalene 539 is a commercial grade of EPDM (ethylene–propylene–diene monomer) terpolymer manufactured under the Royalene brand (Lion Elastomers).
Royalene 539 is formulated as an extrusion-oriented EPDM with high ethylene content, medium molecular weight distribution and high Mooney viscosity, providing excellent green strength and processability for extrusion and certain molded applications.
Royalene 539 is supplied as friable bales for ease of handling and mixing in industrial compounding
Typical uses & applications: Royalene 539 is suited to extrusion and applications requiring good green strength and high ethylene content — common uses include automotive components (hoses, window channels, weatherseals), wire & cable jacketing/insulation, molded goods, and other industrial sealing and hose applications.
Royalene 539 is used a High Ethylene, High Mooney Polymer for TPO Products and Extruded Mechanical Goods.
Applications of Royalene 539: Automotive, Wire and Cable, Extruded Products, Impact Modifiers, TPO Compounds
One of the defining aspects of Royalene 539 is its high ethylene content, which contributes to excellent tensile strength and improved stiffness in the uncured and cured states.
This higher ethylene level also promotes crystalline regions within Royalene 539, enhancing dimensional stability during extrusion and helping the compound maintain its profile shape before vulcanization.
Because of its balanced molecular weight distribution, Royalene 539 responds very well to internal mixing at moderate rotor speeds, breaking down cleanly and dispersing fillers efficiently.
Royalene 539's friable bale form greatly assists dispersion, meaning the polymer "opens up" inside the mixer with minimal energy compared to dense, non-friable elastomers.
In terms of compounding flexibility, Royalene 539 is known for its compatibility with a wide range of fillers, such as carbon black, silica, clay, and mineral reinforcements.
Carbon blacks of medium to high structure typically develop excellent reinforcement with this Royalene 539 due to the polymer’s ability to wet the filler surface and accommodate high loading levels.
This allows compounders to design rubber formulations optimized for durability, hardness, or cost reduction depending on the application.
When compounded with silica systems, Royalene 539 can achieve improved heat aging and compression set properties, making it useful in sealing environments requiring long-term resilience.
One of the important characteristics of this Royalene 539 is its resistance to oxidation, ozone, and UV radiation, which stems from the saturated backbone chemistry typical of EPDM.
This makes Royalene 539 ideal for applications exposed to outdoor climates or fluctuating temperatures.
Unlike many unsaturated rubbers, which crack or degrade under prolonged ozone exposure, Royalene 539 can remain stable for years with minimal surface change.
This long-term weathering stability is one of the biggest reasons EPDM—including Royalene 539—dominates in the automotive and construction industries.
Processing engineers appreciate that Royalene 539 offers predictable cure behavior, especially in sulfur systems.
Royalene 539's ENB-based diene component allows for fast and controllable crosslink formation without generating excessive reversion at typical cure temperatures.
This predictable vulcanization makes Royalene 539 easier to achieve consistent hardness, elongation, and tensile strength across production batches.
When peroxide curing systems are used instead of sulfur, Royalene 539 provides excellent heat stability and retains mechanical strength after prolonged thermal exposure, which is valuable for high-temperature sealing applications.
From a performance standpoint, Royalene 539 contributes to low compression set, meaning seals made from well-formulated compounds bounce back better after long-term compression.
This is critical in gaskets, door seals, and automotive weatherstrips, where failure can lead to air leaks, water intrusion, or poor insulation.
Royalene 539’s low glass transition temperature ensures flexibility at cold temperatures, helping prevent brittleness and ensuring the material retains its sealing function even in winter environments.
In electrical applications, Royalene 539 offers inherent dielectric insulation, making it useful in cable jacketing or insulation systems where moisture, UV, and outdoor aging must be considered.
Royalene 539-based compounds also resist polar fluids like water, steam, and certain cleaning agents, making them useful in industrial hoses and low-pressure systems requiring longevity under wet conditions.
Although Royalene 539 is not suitable for hydrocarbon oils, its resistance to polar fluids makes it valuable in HVAC components, water-handling seals, and outdoor equipment.
PERFORMANCE CHARACTERISTICS & BENEFITS of ROYALENE 539:
*High green strength and high Mooney viscosity — good for extrusion and sections requiring dimensional stability before cure.
*Excellent resistance to heat, ozone and weathering typical of EPDM family — suited to outdoor and automotive exposures.
*Good low-temperature flexibility (due to low Tg).
*Good processability as a friable bale — material breaks down readily during mixing, aiding dispersion.
*Designable cure behavior — diene content allows efficient sulfur vulcanization to achieve useful crosslink density for seals and gaskets.
UNIQUE FEATURES of ROYALENE 539:
*Excellent Green Strength
*Highly extendable
HANDLING of ROYALENE 539:
Handling precautions of Royalene 539 mainly involve avoiding dust generation when cutting bales and ensuring proper ventilation during compounding where fumes or decomposition vapors may be present at elevated temperatures.
Its combustion behavior is typical of hydrocarbon polymers, producing smoke and thermal decomposition gases if involved in a fire, but Royalene 539 does not present unusual reactive hazards.
STORAGE of ROYALENE 539:
Storage is straightforward:
keep Royalene 539 clean, dry, and protected from direct sunlight and high heat to preserve its processability.
Overall, Royalene 539 is a highly versatile EPDM suited for demanding extrusion applications, environments requiring long-term weather resistance, and industrial formulations where durability and predictable cure behavior are essential.
Royalene 539's combination of processability, resilience, and long-term environmental stability makes it a dependable base elastomer for a wide range of specialized rubber products.
UNIQUE FEATURES of ROYALENE 539:
- Excellent Green Strength
- Highly extendable Applications
- Automotive
- Wire and Cable
- Extruded Products
- Impact Modifier, TPO Compounds
- Hose
CHEMICAL/THERMAL BEHAVIOUR of ROYALENE 539:
*Thermal stability & Tg:
EPDMs have low glass transition temperatures (often well below 0 °C; typical EPDM Tg around −50 to −40 °C), which gives good low-temperature flexibility.
Service temperature windows and thermal decomposition onset depend on compound formulation; cured Royalene 539 compounds can be used at moderately high temperatures (EPDM vulcanizates commonly service up to ~125–150 °C depending on formulation).
*Flammability / decomposition:
As an organic polymer, Royalene 539 will burn and produce combustion products (CO, CO₂ and other organics); fires require standard polymer firefighting precautions (self-contained breathing apparatus for responders).
PHYSICAL and CHEMICAL PROPERTIES of ROYALENE 539:
CAS number: 25038-36-2 — this is the common registry CAS used for ethylene/propylene/diene terpolymers (EPDM) corresponding to trade grades like Royalene 539.
EC / EINECS number: Commercial EPDM trade grades are typically handled as polymers in inventories; a discrete EC number is not always listed for a specific trade grade.
Chemical registry entries for the polymer class map to polymer descriptors rather than a single EC entry for every trade name.
For general EPDM polymer listings the related registry information can be found in public inventories (ECHA / eChemPortal).
Chemical name / descriptor: Poly(ethylene-co-propylene-co-5-ethylidene-2-norbornene) or Bicyclo[2.2.1]hept-2-ene,5-ethylidene-, polymer with ethene and 1-propene (the polymer descriptor associated with CAS 25038-36-2).
Molecular formula / weight: As a polymer, Royalene 539 has no single small-molecule formula or single molecular weight; catalog/regulatory entries list repeat-unit based descriptors (e.g., monomer equivalents such as C₁₄H₂₂ per repeat unit and an approximate formula weight for a repeat unit ~190.3 g·mol⁻¹), but a polymer’s Mn/Mw vary by batch and are not quoted as a single number in typical product data sheets.
Physical form / color: Off-white / amber solid, supplied in friable bales (~25 kg / 55.1 lb bale).
Density / Specific gravity: ≈ 0.86 g·cm⁻³ (typical EPDM density).
Mooney viscosity (processability indicator): High Mooney (manufacturer lists values indicative of grades for extrusion; Royalene 539 is reported as high Mooney and high green strength in product literature). Specific Mooney numbers may be given in the TDS for that grade.
Ethylene / Propylene ratio: High ethylene content (manufacturer lists Royalene 539 among higher-ethylene EPDMs; typical family ratios vary by grade).
Diene type & content: EPDM grades use a non-conjugated diene — commonly ENB (ethylidene norbornene) — at level controlled by grade. Royalene family papers and TDS show the diene content is sufficient to provide efficient sulfur vulcanization (exact wt% for 539 is provided on the technical sheet).
Volatile matter / residuals: Low volatile matter (spec sheets commonly specify ≤ 0.7 wt% for Royalene grades).
Solubility: Insoluble in water; typical EPDM will swell in certain organic solvents and dissolve only under strong conditions used for polymer analysis.
FIRST AID MEASURES of ROYALENE 539:
-Description of first-aid measures
*General advice:
Show this material safety data sheet to the doctor in attendance.
*If inhaled:
After inhalation:
Fresh air.
*In case of skin contact:
Take off immediately all contaminated clothing.
Rinse skin with
water/ shower.
*In case of eye contact:
After eye contact:
Rinse out with plenty of water.
Call in ophthalmologist.
Remove contact lenses.
*If swallowed:
After swallowing:
Immediately make victim drink water (two glasses at most).
Consult a physician.
-Indication of any immediate medical attention and special treatment needed.
No data available
ACCIDENTAL RELEASE MEASURES of ROYALENE 539:
-Environmental precautions:
Do not let product enter drains.
-Methods and materials for containment and cleaning up:
Cover drains.
Collect, bind, and pump off spills.
Observe possible material restrictions.
Take up dry.
Dispose of properly.
Clean up affected area.
FIRE FIGHTING MEASURES of ROYALENE 539:
-Extinguishing media:
*Suitable extinguishing media:
Carbon dioxide (CO2)
Foam
Dry powder
*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.
-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.
EXPOSURE CONTROLS/PERSONAL PROTECTION of ROYALENE 539:
-Control parameters:
--Ingredients with workplace control parameters:
-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use equipment for eye protection.
Safety glasses
*Body Protection:
protective clothing
*Respiratory protection:
Recommended Filter type: Filter A
-Control of environmental exposure:
Do not let product enter drains.
HANDLING and STORAGE of ROYALENE 539:
-Conditions for safe storage, including any incompatibilities:
*Storage conditions:
Tightly closed.
Dry.
STABILITY and REACTIVITY of ROYALENE 539:
-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature).
-Possibility of hazardous reactions:
No data available
