Custom Molded Rubber Parts

Lasting Protection Against Abrasion, Impact and Corrosion

Élastomont designs and manufactures a wide range of molded rubber parts, from simple seals to high-performance components intended for extreme environments, such as underwater applications, pressurized equipment, or aggressive chemical settings. For over 35 years, our Quebec-based company has stood out for its expertise in designing, molding, and assembling custom parts that meet the most demanding mechanical, chemical, and thermal requirements.

Molded high-performance rubber parts including Nitrile (NBR), Natural Rubber (NR), EPDM, Viton (FKM), Hypalon (CSM), and HNBR. The collection features O-rings, bellows, bushings, mounts, and complex shapes, predominantly black, accompanied by distinct colored elements in red, blue, orange, yellow, and grey.

We master all rubber molding processes: compression molding for short, robust series; transfer molding for technical parts with tight tolerances; and injection molding for medium to high volumes requiring repeatability and speed. Our teams also handle overmolding of metal inserts (steel, stainless steel, aluminum) with controlled adhesion using precise primer and curing systems.

Each project benefits from a DFM (Design for Manufacturability) approach, precise control of pressure, temperature, and cycle time, and full traceability. Our formulations cover NR, SBR, NBR/HNBR/XNBR, EPDM, CR (Neoprene), VMQ/FVMQ (Silicone), FKM/Viton®, PU, SMP 800C, with certifications available including FDA, NSF, RoHS, UL, USP Class VI, ASTM, and MIL-Specs. The result: durable, dimensionally stable parts tailored to the strictest mechanical, chemical, and thermal demands.

Élastomont serves an industrial clientele across Quebec, Canada, and North America, offering custom molding solutions that combine performance, durability, and precision.

Why choose Elastomont?

Overview of technical molded rubber parts by Élastomont, featuring a cross-section view of a rubber-to-metal bonded insert, surrounded by precision O-rings and protective bellows.
Exceptional Quality and Consistency

Every custom molded part is produced under strict control of pressure, temperature, and cycle time. This rigorous process guarantees geometry perfectly faithful to the design, tight tolerances, and a flawless finish, even for the most complex shapes.

Precision inspection of a molded rubber part on engineering blueprint.
Optimized Engineering & Design (DFM)

"Our engineers optimize every custom part to maximize service life, enhancing resistance to abrasion, impact, chemicals, and extreme temperatures. By strictly applying Design for Manufacturing (DFM) principles, we ensure production efficiency and significantly reduce your total cost of ownership (TCO)."

Gloved hands comparing a white 3D-printed prototype and a final black molded part at an industrial workbench. A computer screen in the background shows the part's CAD model, and a large, open metal injection mold sits on the table, surrounded by tools and other components.
Rapid Prototyping and Reproduction

We faithfully reproduce your parts, whether new or worn, even without technical drawings. We create rapid prototypes to strictly validate geometry and function before launching volume production.

Close-up of a gloved hand holding an industrial black rubber part overmolded onto a shiny steel insert. The part is displayed above a clean stainless steel workbench containing other rubber seals and metal components, against a neutral white background.
Expertise in Metal Insert Overmolding

We master the overmolding of metal inserts (steel, brass, aluminum) for superior rubber-to-metal bonding. Our rigorous surface preparation ensures a durable and virtually tear-proof chemical bond.

Heat sealing blue O-rings in a bag with an Elastornont lot label.
Full Traceability and Compliance

Every batch is fully traced and documented (material certificates, dimensional checks, production reports). Upon request, we guarantee compliance with the strictest standards: RMA tolerances, FDA/NSF, RoHS, UL, USP Class VI, ASTM, and military norms.

Molding Processes

Élastomont offers three industrial processes tailored to production type, volume, and part complexity:

Compression Molding

Rubber is placed in the mold cavity, then pressure and heat are applied until full vulcanization. This process produces dense, stable, robust parts with excellent material uniformity. Versatile and reliable, it is particularly well-suited to small and medium runs and ensures excellent material control as well as optimal metal-rubber adhesion.

ubber compression molding diagram showing the rubber charge placed in the open mold, followed by compression as the upper mold closes.

Characteristics:

  • Production volume: Low to medium
  • Dimensional precision: Good
  • Surface quality: Fair to good
  • Flash: Moderate
  • Cycle time: Longer
  • Tooling cost: Low
  • Typical tolerances: ±0.25 to ±0.50 mm
  • Metal-rubber adhesion force : Excellent — prolonged pressure and slow curing ensure complete and lasting bonding
  • Compatible materials : All elastomers (NR, SBR, NBR, EPDM, etc.)
  • Applications : Gaskets, plates, stops, isolators, thick parts

Limitations : Longer cycle times, risk of flash depending on geometry

Advantages : Flexible, low cost, uniform density, excellent metal-rubber bonding

Transfer Molding

Transfer molding combines the advantages of compression and injection processes. Material is preheated and pushed under pressure through channels into the mold cavities. This method guarantees precision and dimensional stability, making it ideal for technical parts or those with metal inserts.

Technical diagram illustrating the rubber transfer molding process. The image details internal components (plunger, transfer pot, charge, sprue, mold cavity, and ejector pin) during the injection and molding phases.

Characteristics:

  • Production volume : Medium
  • Dimensional precision : Very good
  • Surface quality : Very good
  • Flash : Minimal
  • Cycle time : Intermediate
  • Tooling cost : Medium
  • Typical tolerances : ±0.15 to ±0.30 mm
  • Metal-rubber adhesion force: Good — uniform pressure promotes solid and consistent bonding
  • Materials compatible: Technical elastomers, parts with inserts
  • Applications: Complex parts, precision gaskets, tight-tolerance components

Advantages : Precision, low flash, excellent dimensional stability, good bonding control on inserts

Limitations: More expensive tooling than compression, less economical for large runs

Injection Molding

Injection molding is the most automated and fastest process. Material is plastified and injected under pressure into heated closed molds. It is particularly well-suited to medium to high-volume runs requiring consistent quality and tight tolerances.

Detailed cross-sectional diagram of the rubber injection molding process. The illustration displays the rubber material (shown in red) being injected through a nozzle bushing and sprue into the mold cavities. Key components are labeled, including the top and bottom plates, stripper bolts, injection cull, runner system, and dowel pins.

Characteristics:

  • Production volume : Medium to high
  • Dimensional precision : Excellent
  • Surface quality: Uniform and clean
  • Flash: Minimal
  • Cycle time: Very fast
  • Tooling cost: High
  • Typical tolerances: ±0.05 to ±0.15 mm
  • Metal-rubber adhesion force: Medium to good — depends on insert preheating, injection temperature, and cycle time
  • Compatible materials: Technical compounds with stable viscosity
  • Applications: Fine geometry parts, high-volume production, high-value parts

Advantages : Fast cycle, excellent repeatability, superior finish

Limitations : High initial investment, less suitable for small runs

Comparison Guide

Process Volume Tolerance Advantages Limitations
Compression Low to Medium ±0.25 to ±0.50 mm Excellent metal-rubber adhesion, flexibility, low cost Longer cycle time, risk of flash
Transfer Medium ±0.15 to ±0.30 mm Accuracy, low flash, dimensional stability Higher tooling cost, less economical for large runs
Injection Medium to High ±0.05 to ±0.15 mm Fast cycle, repeatability, superior finish High initial investment, less suitable for small runs
Raw materials and custom molded rubber parts including SBR, natural rubber, EPDM, and silicone for industrial applications.

Materials Used for Molded Rubber Parts

Technical Selection According to Application and Industry

The choice of elastomer is a critical factor in the performance and service life of molded rubber parts. At Élastomont, each material is selected based on real operating conditions: continuous service temperature, chemical exposure, abrasion, mechanical cycles, pressure, and applicable standards.

The temperature ranges indicated correspond to typical values in industrial service and may vary depending on the formulation, medium, and usage cycle.

Natural Rubber (NR)

Natural rubber offers excellent resilience, very high tensile strength, tear resistance, and abrasion resistance, making it a reference material for dynamic applications and wear-resistant linings.

It is not very compatible with oils, solvents, or acids.

Continuous Service Temperature (typical): −50 °C to +80 °C

Typical parts

Wear plates, slides, dampers, skirts, thick molded parts, anti-abrasion linings

Industries

Mines, quarries, mineral processing, bulk material handling, heavy industry

SBR (Styrene-Butadiene Rubber)

SBR is an economical synthetic elastomer offering good resistance to abrasion and mechanical shock for applications with moderate stress.

Its chemical resistance is limited.

Continuous Service Temperature (typical): −40 °C to +90 °C

Typical parts

Flat seals, washers, skirts, protections, non-critical molded parts

Industries

General manufacturing, standard industrial equipment, maintenance

Nitrile (NBR)

NBR is widely used for its high compatibility with oils, fuels, and hydraulic fluids while maintaining good mechanical properties in oily environments.

Continuous Service Temperature (typical): −30 °C à +110 °C

Possible Peak : Up to +120 °C depending on formulation

Typical parts

O-rings, molded seals, membranes, hoses, hydraulic parts

Industries

Hydraulics, oil and gas, industrial machinery, transportation

XNBR (Carboxylated Nitrile)

XNBR is an enhanced version of NBR offering superior wear resistance and improved metal-rubber adhesion, ideal for parts subjected to friction and mechanical load.

Continuous Service Temperature (typical): −30 °C to +110 °C

Typical parts

Molded parts with metal inserts, wear-resistant seals, scrapers

Industries

Mines, heavy industrial equipment, friction mechanical systems

HNBR (Hydrogenated Nitrile)

HNBR combines the chemical resistance of NBR with superior thermal, mechanical, and ozone resistance. It is adapted to severe environments and long-service-life applications.

Continuous Service Temperature (typical): −30 °C to +140 °C

Possible Peak : Up to +150 °C

Typical parts

High-performance seals, hydraulic components, automotive parts

Industries

Automotive, energy, high-performance hydraulics, critical equipment

EPDM (Ethylene-Propylene-Diene)

EPDM is recognized for its exceptional stability against heat, steam, ozone, and UV exposure.

It is incompatible with mineral oils and hydrocarbons.

Continuous Service Temperature (typical): −40 °C à +130 °C

Pointe possible : jusqu’à +150 °C

Pièces typiques

Joints vapeur, joints d’eau, membranes, pièces d’étanchéité extérieure.

Industries

Traitement de l’eau, vapeur industrielle, énergie, bâtiment industriel.

Neoprene (CR)

Neoprene is a versatile elastomer offering good balance between mechanical, chemical, and environmental resistance, with moderate oil resistance.

Continuous Service Temperature (typical): −35 °C to +90 °C

Possible Peak: Up to +120 °C

Typical parts

Seals, gaskets, steam hoses, radiators, cable sheathing, electrical insulation, marine components

Industries

Marine, automotive, industrial equipment, electrical applications

Hypalon (CSM)

Hypalon (CSM) offers excellent resistance to oxidation, ozone, and chemicals, and is self-extinguishing. Highly stable, it withstands heat and hydrocarbons.

Continuous Service Temperature (typical): −40 °C to +150 °C

Possible Peak: Up to +150 °C

Typical parts

Acid-resistant linings, cable sheaths, membranes, exterior protections, parts exposed to hot oils

Industries

Chemical processing, energy, marine, industrial protection

Butyl (IIR)

Butyl stands out for its exceptional impermeability to gases and steam, and excellent resistance to polar chemicals, water, and heat. It has limited compatibility with oils but is ideal for closed chemical environments.

Continuous Service Temperature (typical): −45 °C to +125 °C

Typical Parts

Gas-tight seals, tank interior linings, inner tubes, hoses, membranes

Industries

Chemical storage, energy, pharmaceutical, sealed systems

Silicone (VMQ)

Silicone offers exceptional thermal and chemical stability from −60 °C to +230 °C while remaining flexible at low temperatures. It has very good electrical properties and excellent resistance to ozone and weathering, but limited resistance to oils and abrasion.

Its mechanical and abrasion resistance is limited.

Continuous Service Temperature (typical): −60 °C to +200 °C

Possible Peak: up to +230°C

Typical parts

Static seals, insulators, food and medical parts (FDA grade), high-temperature applications

Industries

Medical, food processing, aerospace, high-temperature applications

Fluorosilicone (FVMQ)

FVMQ combines silicone flexibility with improved resistance to fuels, oils, and aromatic solvents. Stable from −60 °C to +200 °C, it is ideal for environments with wide temperature fluctuations.

Continuous Service Temperature (typical): −60 °C to +180 °C

Possible Peak: up to +200 °C

Typical Parts

Fuel seals, aerospace components, membranes, precision sealing, high-end equipment

Industries

Aerospace, automotive, energy, high-performance equipment

Polyurethane (PU)

Polyurethane offers exceptional mechanical, tensile, tear, and abrasion resistance, with excellent resilience. It performs well with oils but only moderately with acids and solvents.

Continuous Service Temperature (typical): −40 °C to +90 °C

Possible Peak: up to +90 °C

Typical parts

Pads, rollers, scrapers, dampers, stops, wheels, wear parts

Industries

Material handling, manufacturing, industrial equipment, wear applications

Viton® / FKM

Viton® (FKM) is the elastomer of choice for extreme conditions: outstanding resistance to heat, oils, solvents, acids, and aromatic hydrocarbons. It maintains elasticity up to +250 °C and ensures durable sealing.

Continuous Service Temperature (typical): −20 °C to +200 °C

Possible tip depending on grade : up to +250°C

Typical parts

High-performance seals, fuel and lubrication system components, automotive and aerospace parts

Industries

Automotive, aerospace, chemical processing, energy, high-performance applications

Important Note

This comparison serves as a general guide; each project must be evaluated individually. Materials can be formulated or modified to optimize chemical, mechanical, or regulatory properties (FDA/NSF/UL/MIL/ASTM), including metal-to-rubber adhesion, hardness, elasticity, or resistance to wear and heat. Specialized additives (flame retardants, UV stabilizers, antistatic agents, pigments, plasticizers) allow each formulation to be tailored. The final selection must be validated by an engineer or polymer specialist according to the exact operating conditions.

Example of products: Shooting Range Rubber, Star Sorting Wheel

Rubber shooting center
Star sorting wheel

FAQ – Custom Molded Rubber Parts

Compression: short/medium runs, robust geometry. Transfer: fine details, minimal flash. Injection: higher volumes, consistent speed and quality. Choice depends on volume, tolerances, allowable flash, and tooling cost.
Based on real use: abrasion/impact, chemical exposure, oil/fuel, temperature range, mechanical constraints, UV/ozone. We propose 1–2 material options balancing cost and performance.
Yes, steel, stainless steel, aluminum, and other substrates. Surface prep + adhesive system, adhesion verified on first batch.
Tight functional tolerances defined by drawing. Elastomer molding tolerances depend on part, process, and material shrinkage; RMA dimensional control provided if required.
Yes. We measure, characterize material, propose equivalence/optimization, and, if needed, redesign the part and tooling.
Available on request and depending on material: FDA/NSF, RoHS, UL, USP Class VI, ASTM, MIL Specs, SMP800C. Full batch traceability and material certificates available.

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Elastomont

At Élastomont, innovation meets resilience. Our custom rubber products are designed to withstand pressure and ensure your business runs smoothly.

Products

Custom Molded Rubber PartsRubber LiningWear Plates & Abrasion Protection ProductsPre-stretch RollersRubber and Polyurethane Roller CoverRubber Sheets and RollsRubber ExtrusionPolyurethane Parts

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