Rubber seals are among the most critical components in modern engineering. They prevent the leakage of gases or fluids, dampen vibrations, and provide weatherproofing in machinery, vehicles, buildings, and pipelines. From the automotive industry to mining, food processing, and medical equipment, the demand for high-performance rubber moulded seals is growing as the need for tighter tolerances, improved reliability, and longer service life increases.
Seal ‘n Devices specialises in manufacturing and supplying top-quality rubber moulded seals engineered to perform under pressure. With over 35 years of experience in rubber, silicone and polyurethane moulding, we serve industries across Southern Africa with precision sealing solutions backed by world-class standards and custom engineering.
What Are Rubber Seals?
Rubber seals are elastomeric components designed to block the passage of liquids, gases, dust, or contaminants between joined surfaces. They are flexible, durable, and capable of absorbing pressure, temperature changes, and vibration. Rubber seals can be moulded in various shapes and materials to meet the requirements of different mechanical systems and environmental conditions.
Why Choose Rubber Seals from Seal ‘n Devices?
Seal ‘n Devices manufactures high-quality rubber seals offering various benefits.
Superior Material Quality
We use both natural and synthetic rubbers, including EPDM (ethylene propylene diene monomer), Nitrile (Buna-N), Neoprene, Silicone, and Viton, depending on your application’s specific chemical, thermal, and mechanical needs.
Custom Moulding and Design
We offer custom-designed rubber seals tailored to client drawings or samples, ensuring an exact fit and maximum performance. All stages, from tooling design/manufacture to the moulding process is done in house.
Excellent Resistance Properties
Our seals are engineered to resist:
- Heat and cold extremes
- Oils, fuels, and chemicals
- UV and ozone degradation
- Compression and wear
Local Manufacturing, Global Standards
Our rubber moulded seals, manufactured in-house in South Africa, meet international quality standards for sealing integrity, lifespan, and safety.
Types of Rubber Seals We Manufacture
Seal ‘n Devices can manufacture a comprehensive range of rubber moulded seals for different industries and applications. We specialise in moulding custom rubber seals, including:
- Custom-Moulded O-Rings: O-rings are circular rubber seals used in static and dynamic applications. They prevent fluid or gas leaks in hydraulic and pneumatic systems.
- Gaskets: Flat or cut rubber seals that provide tight sealing between flanges, covers, or components. Used in automotive engines, pipelines, pumps, and machinery.
- Moulded Lip Seals/Oil Seals: Used primarily in rotating shafts to retain lubricants and exclude contaminants. Common in motors, gearboxes, and pumps.
- U-Cup Seals: U-cup seals are dynamic and provide excellent sealing under high pressure. They are often used in hydraulic cylinder systems.
- Weatherstripping Seals: Rubber extrusions designed to seal doors, windows, and enclosures from environmental elements like dust, wind, and water.
- Bonded Seals/Dowty Seals: Rubber-to-metal bonded seals used in bolted joints to maintain a fluid-tight seal under high pressure.
Industry Applications for Rubber Seals
Seal ‘n Devices serves various industries that rely on high-performance rubber moulded seals, including:
- Construction and Infrastructure: Expansion joints, weatherproofing, and vibration control
- Automotive and Transport: Engine gaskets, fuel system seals, suspension bushings
- Industrial Manufacturing: Equipment sealing, hydraulic and pneumatic systems
- Chemical Processing: Seals for corrosive environments and high-temperature operations
- Energy and Power: Seals in generators, turbines, and electrical housings
- Food and Medical Industries: Seals approved for hygiene-critical applications
Our rubber moulded seals are trusted to perform in high-stress environments, offering long-term sealing solutions that reduce downtime and maintenance costs.
Custom Rubber Seal Solutions
Not all applications are the same, which is why we offer custom rubber moulded seal manufacturing based on:
- CAD drawings or technical specs
- Application-specific chemical and temperature resistance
- Quantity requirements (small batches to large-scale production)
Our engineering team works closely with customers to design, prototype, and deliver custom rubber sealing solutions that meet exacting standards.
Manufacturing Methods of Moulded Rubber Seals
The most common methods that we use are as follows:
- Compression Moulding: Economical for low to medium production runs, especially used for large custom seals.
- Transfer moulding: Good for medium volumes and improved precision.
- Injection Moulding: Ideal for high volume, complex and tight toleranced seals.
FAQs About Rubber Seals
What is the best rubber material for oil resistance?
Nitrile (Buna-N) is the most commonly used rubber for oil and fuel resistance. Viton is also used in high-temperature and aggressive chemical environments, however we can manufacture seals in almost any mouldable compound. These include: natural rubber, neoprene, EPMD, butyl, silicone, polyurethane to name a few.
How long do rubber seals last?
Rubber seals can last 5 to 20 years or more, depending on the material and usage conditions. Proper installation and material selection are key to longevity.
Can rubber seals withstand high pressure?
Yes. Specially designed seals such as U-cups, O-rings, and lip seals are engineered to withstand high-pressure environments in hydraulic and pneumatic systems.
Do you provide custom-sized rubber seals?
Yes. We custom-manufacture seals to fit specific applications based on samples, drawings, or dimensional requirements. We can custom mould seals in various materials.
Are your rubber seals suitable for food-grade applications?
Yes. We supply FDA-approved silicone and EPDM seals for food and medical applications, ensuring hygiene, compliance, and safety.
Get the Best Rubber Seals for Your Application at Seal ‘n Devices
Whether you need standard O-rings or highly specialised rubber seal solutions, Seal ‘n Devices is your trusted partner for durable, high-performance rubber sealing products. We combine advanced moulding techniques with over 30 years of industry experience to deliver precision-engineered components that outperform expectations.
Contact us today for expert guidance and product recommendations.
