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Namrata Rubbers is a company that provides precision sealing solutions for rubber gasket manufacturers in South Africa. We have several factories in Johannesburg, marine yards in Cape Town, refineries in Durban, and plants in Pretoria. We manufacture custom-designed high-temperature-resistant rubber gaskets, which can function effectively even at extreme temperatures from -40°C up to 200°C.
We handle custom orders for O-rings, profiles, and envelope gaskets, all made through compression molding. You get consistent quality, with Shore A hardness ratings between 50 and 90, and a tight tolerance of ±0.2mm where it matters most for leaks. Every month, we turn out about 200,000 units using multi-cavity tools. For exports across Africa, we ship FOB Durban with all the right documents—COO, Incoterms, you name it.
Not only do our gaskets comply, but they also last. Our parts are designed to withstand harsh chemicals, as certified by ASTM D2000, and will even hold up for 1,000 hours of UV exposure, with a lifespan of over a decade in the toughest industry conditions.
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In South Africa, industrial rubber gaskets serve a dual purpose: they seal the gap between flange faces and also mitigate vibration, aiding thermal insulation in machinery. These robust elastomer components maintain a gas-tight seal, even under bolt loads reaching 20 MPa.
The company works with all sorts of industries. In Johannesburg, they keep mining equipment running with crusher dust seals. Over in Durban, they help keep oil and gas pipelines tight and safe from hydrocarbon leaks. Construction crews rely on these gaskets for abrasion protection. Down in Cape Town, they make sure marine engine flanges can handle saltwater. Chemical plants use them to keep corrosive fluids contained. Food and pharmaceutical factories trust the gaskets for joints that need to stay clean and hygienic. Even HVAC systems depend on them for pressure vessel isolation.
Some compounds, like EPDM, stand up to tough coastal weather—they pass 1,000-hour ozone exposure tests without breaking a sweat. Nitrile gaskets hold strong against petroleum, so they’re perfect for places like Durban refineries and Cape Town shipyards where there’s a lot of salt in the air.
Namrata Rubbers doesn’t just serve South Africa. They ship to Namibia, Botswana, and Mozambique too, sending orders out from Durban with all the right paperwork—COO certificates, packing lists, and crating that meets Incoterms requirements. They produce up to 50,000 linear meters of gasket per month, all made from SABS-approved compounds, so regional customers always have what they need.
Namrata Rubbers makes precision gaskets using compression molding. They pick the material based on how the gasket needs to perform and what the flange looks like.
Description: Flexible silicone rubbers are a popular choice when it comes to making gaskets that seal two surfaces from leaking. Gaskets made from silicone are used in different setups where food, medical, or industrial processes take place. These types of rubber are designed to endure not only high temperatures but also moisture and chemicals.
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Description: Neoprene rubber gaskets are synthetic rubber sealing parts which stand out due to their resistance to oil, weather, and temperature. The priority use of these gaskets is to create leak-proof seals for various machines.
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Description: Nitrile rubber gaskets are the perfect choice if friction and sealing are required, especially where oils or fuels are involved. They can be a very effective way of preventing leakage of oil-based fluids, such as in the case of petroleum-based fluids. Besides, they are highly flexible and offer great resistance in the automotive, industrial, and hydraulic fields when used at moderate temperatures.
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Description: Weather-resistant rubber is the material from which EPDM rubber gaskets are made. Such gaskets are very resistant to water, heat, and sunlight, so they constitute a perfect choice for situations where they are subjected to the weather elements.
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Description: Natural rubber gaskets are flexible sealing components composed of flexible rubber, which aid in sealing two surfaces. The natural rubber gaskets offer a durable and textured surface that can be utilized in water systems, low-pressure systems, and for various industrial purposes.
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Description: Tri Clover Gaskets work in clean-in-place systems—those surfaces are mirror-polished and stick to strict sanitary standards for EPDM or silicone.
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Description: Rubber gaskets for flanges are one type of sealing component that is usually placed between two flanged surfaces for sealing purposes. The rubber gasket makes a strong seal even under pressure and therefore can be used in systems like pipes and fluid or gas handling.
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Description: The PCD rubber gaskets are a type of gasket that has a specific pitch circle diameter hole pattern, ensuring accurate alignment and a secure seal when installed in a flanged connection.
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Description: Fluid bed dryer systems use FBD rubber gaskets for sealing purposes. The FBD rubber gasket is a sealing device that prevents leakage of air and helps in efficient drying process execution.
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Description: The two-port profile in FBD rubber gaskets double nozzle ensures that both ports of the nozzle are sealed, ensuring pressure integrity during both hot air and material discharge.
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Description: A precision mold profile in FBD rubber gaskets single nozzle provides single nozzle connections with the O-profile for sealing with vacuum and/or pressure cycles.
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Description: A silicone or NBR bladder is inflated to an internal pressure of 2-4 bar, ensuring contact with irregular surfaces by expansion of air chambers.
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Description: Sponge rubber gaskets are compressible sealing elements used to fill gaps between two or more surfaces, and they are made of a soft material. The advantage of these gaskets lies in their ability to provide cushioning and sealing against air, dust, and moisture.
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Description: Endless rubber gaskets are continuous sealing rings without any seams, and they are made without any cuts. They are uniform in sealing surfaces and can be used in applications where there is a need for a leak-tight performance in tanks, lids, and circular enclosures.
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Description: Cord rubber gaskets can be supplied in coil form, ranging in diameter from 3 to 12mm, for cutting and splicing on-site.
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Description: Rubber gaskets are long, flat pieces of material used to cover joints and spaces between two surfaces. They provide a flexible seal for dust, moisture, and air, making them appropriate for panels, doors, and industrial enclosures.
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Description: The gear and shifting system shifter rubber gaskets are sealing elements used to ensure that there is no leakage of lubricants. The rubber gaskets ensure a tight fit, which in turn ensures smooth functioning.
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Description: The butterfly gaskets are special types of gaskets that are meant to be used in butterfly valves, and they are placed between two flanges to prevent leakage. This gasket ensures a tight fit when controlling the flow of fluids, such as water, air, and other fluids, in various systems.
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Description: The vibro shifter gasket is flexible and is made from nitrile or polyurethane materials and is designed to match the vibrations of the screen frame while keeping fine particles from escaping.
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Description: Continuous sealing profiles are extruded rubber gaskets. They are made through the extrusion process. Continuous sealing profiles are used for sealing gaps in edges and joints. They are usually found in doors, windows, enclosures, and other industrial equipment.
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Description: Compression grommets are made from neoprene and silicone materials with a range of 30-50% compression used for cables with diameters measuring between 5 and 50mm.
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Description: Rubber square gaskets are flat sealing components with a square shape, used for sealing square or rectangular joints. The sealing components provide a tight seal against leakage, hence used in tank, enclosure, and equipment applications.
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Description: This is a solid rubber diaphragm without any fabric reinforcement, and it is used in applications where displacement is low, typically up to 10mm of deflection.
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Description: In this type of gasket, seals in U-channel or bulb form contain fine powders by matching the shape of hopper lips and discharge flaps.
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Description: Clear rubber gaskets are transparent seals that allow visibility and at the same time ensure a tight seal. Clear rubber gaskets are mostly used in devices that require visual control of flow or content, for example, medical, food, and lab equipment.
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Industrial manufacturers, suppliers, distributors, exporters, and dealers are connected at the local level for the ease of procuring the required gaskets for various uses.
The demand for nitrile rubber gaskets is mainly from the mining industry for pump housing and valve seat applications. The manufacturers of EPDM rubber gaskets produce molded products for compressor applications. The wholesalers arrange for bulk pallets to be delivered to the Witwatersrand area. The exporters arrange for FOB Johannesburg shipment. The retailers are ready to dispatch the stock at short notice for emergency requirements.
The infrastructure for marine and coastal regions requires the use of neoprene rubber gaskets for pipe flanges and HVAC applications. The manufacturers keep the stock of ANSI Class 150 flanges ready for dispatch. The suppliers provide the required products for the Table Bay shipyards. The distributors arrange for the import of containers. The exporters arrange for the packaging of the products for coastal region compliance. The dealers provide the service for fitting the gaskets for the refitting of ships.
The demand for Viton rubber gaskets for the chemical transfer lines at 10 bar pressure is from the oil and port industries. The manufacturers produce spiral-wound rubber gaskets. The suppliers provide the required products for the Transnet terminals. The distributors arrange for the logistics for the import of containers. The exporters arrange for the COO documentation. The dealers provide the service for the high-temperature grades for tanker loading.
The automotive and government industries require the use of silicone rubber gaskets for engine manifold applications. The manufacturers produce the required sets of O-rings for the automotive industry. The suppliers provide the products for the Rosslyn area. The distributors arrange for large orders from the OEMs. The exporters arrange for the regulations for the automotive industry from SABS. The dealers provide the service for the testing sessions.
The automobile industry favors the use of cork-rubber composites in the manufacture of head gaskets. The manufacturers produce bonded assemblies for Coega IDZ pipeline networks, while the suppliers input the assembly schedule, distributors handle just-in-time delivery, exporters dispatch the first batch of prototypes, and dealers provide information regarding torque values.
Rubber gaskets provide the necessary sealing in fluid systems by compressing and resisting pressure and exposure in various industrial sectors in South Africa.
Nitrile gaskets are used in the sealing of slurry pumps and crushers against the abrasive pulp in the Witwatersrand gold mines, withstanding pressures of up to 10 bar in cyclic operations.
EPDM gaskets are used in the sealing of pipeline flanges exposed to hydrocarbons, thereby ensuring leak-free connections during refinery turnarounds at the refinery in Durban.
Silicone gaskets are used in the sealing of engine valves in automobile plants, thereby withstanding temperature variations from -40°C to 150°C and preventing leakage of engine oil during automobile assembly plants.
Neoprene gaskets are used in the expansion of concrete by ±5mm in the construction of bridges and buildings, thereby meeting the necessary sealing standards in the construction industry.
Viton gaskets are used in the sealing of propeller shafts in fishing vessels in Cape Town, thereby ensuring watertight connections in the vessels.
Silicone O-ring gaskets are used in the sealing of pharmaceutical machines and homogenizers in the dairy industry, thereby meeting the necessary hygiene standards in the pharmaceutical and food industry.
EPDM gaskets are used in the sealing of ventilation ducts in high-rise buildings, thereby reducing leakage and meeting the necessary efficiency standards in the industry.
FFKM gaskets are used in the sealing of chemical reactors against the exposure of harsh chemicals in chemical plants, thereby meeting the necessary standards in the chemical industry.
NBR gaskets are used in the sealing of filtration housing against the exposure of chlorinated water in the purification of water in the Johannesburg area.
Namrata Rubbers is a specialist in precision engineering of rubber gaskets through transfer molding, which has a tolerance of ±0.1mm over a range of 50mm to 1000mm in diameter. Custom engineering services include the conversion of drawings provided by customers into 3D CAD models for finite element analysis of stress distribution in the material of the rubber gaskets prior to tooling manufacture.
The integration of computer-aided design in the design of the gasket involves the selection of materials that can be used in different applications. For example, nitrile can be used in applications involving exposure to oil, while EPDM can be used in steam applications at 150°C. Virtual prototyping of the design is used in the selection of the material, which cuts down the number of iterations by half.
The company has the potential of producing up to 50,000 pieces per month using 20-cavity molds. It has been supplying products to OEMs in Johannesburg and refineries in Durban. The products have a hardness of 50-90 Shore A, which is achieved through the company's automated vulcanization process.
Export documents that the company provides for the export of products from Mumbai include commercial invoices, packing lists, certificates of origin, and RoHS compliance. The documents have been cleared through customs in South Africa within the expected period.
Strict quality inspection involves the measurement of dimensions using 100% dimensional gauging, durometer measurement in accordance with ASTM D2240, and leak rate measurement at 10 bar of nitrogen pressure.
Technical support services involve audits of the seal in the field and failure analysis for the optimization of the lifespan of the product.
| Material | Temperature Range | Oil Resistance | UV Resistance | Best Application |
| Silicone | -50°C to 250°C | Moderate | High | Electrical & HVAC [ASTM D1418] |
| Nitrile | -40°C to 120°C | Excellent | Moderate | Oil & fuel systems [ASTM D2000] |
| EPDM | -40°C to 150°C | Low | Excellent | Outdoor equipment [ASTM D2000] |
| Neoprene | -35°C to 120°C | Good | Good | Marine machinery [ASTM D2000] |
| Natural Rubber | -40°C to 80°C | Low | Moderate | General machinery [ASTM D2000] |
All compounds tested for compression set per ASTM D395 (<25% maximum). Surface finish Ra 1.6-3.2µm standard for flange sealing.
What type of rubber gasket is best for mining?
Nitrile rubber gaskets have superior abrasion resistance for crusher dust seals and conveyor skirtboards, where they retain their compressibility under vibration and protect against hydraulic fluid exposure common in underground mining equipment.
Which gasket is oil-resistant?
Nitrile (NBR) gaskets have less than 10% volume swell after immersion for 70 hours in petroleum oils; therefore, they are best for use in hydraulic fittings for fuel transfer connections in machinery.
Can your gaskets handle saltwater exposure and other marine environments?
The Neoprene gasket is best for saltwater exposure with good ozone resistance and fair oil compatibility for hatch coverings, pump housings, and deck equipment for coastal shipyard service.
Do you export rubber gaskets across Africa?
The export procedure involves FOB Durban packaging, certificate of origin documents, fumigation clearance documents, and Incoterms documents for export to Namibia, Botswana, and Mozambique within a period of 7-14 days using established freight routes.
Can you manufacture custom sizes?
Custom profiles from 5-50mm cross-sections, up to 10 meters long, can be designed for non-standard flanges and equipment housings through the process of extrusion or molding.
What is the lifespan of industrial rubber gaskets?
The average lifespan of a typical industrial gasket is between four and eight years. Under rated conditions, the gaskets maintain their sealing properties for a period of 5-12 years, as verified by compression set tests where the permanent deformation is less than 25% after 22 hours at 70°C.
Are your gaskets food-grade compliant?
Silicone-based gaskets comply with the FDA's 21 CFR 177.2600 requirements for repeated food contact and can be used for hygienic applications in pump casings, hopper gates, and conveyor transitions for food processing plants.
Bulk pricing is available on quantities over 1,000 meters, with graduated pricing depending on volume and complexity of profiles. Custom design support includes CAD work on profiles and prototype testing within a 7-day window to accommodate unique flange designs and compression requirements.
Existing logistical relationships ensure delivery within a 2-4 day window to all industrial centers, including Johannesburg factories and ports of Port Elizabeth. Standard compounds and profiles allow a permanent inventory, resulting in an average lead time of 48 hours from confirmed specifications.
Export packaging meets FOB requirements, including COO documentation and moisture-resistant crating, and is configured to meet Incoterms requirements.
Upload your flange designs now and receive immediate engineering and pricing feedback. Sealing failure issues are solved within 24 hours.
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