Gaskets | South Africa | Sizonke Trading

Welcome to Sizonke Trading, an Industrial Engineering group that has been a trusted name in Southern African market since our inception in 1994. Driven by our commitment to innovation, client satisfaction and reliability, we are the trusted engineering specialists in industries such as Petrochemical, Pulp & Paper, Mining and Power Generation . From sealing solutions to specialized lubrication, we offer a range of products that cater to every need, budget, and concern.

Sizonke Trading is one of South Africa’s largest suppliers of cut gaskets, gasket sheets, PTFE gaskets, spiral wound gaskets, camprofiles, and Fishbone gaskets. With a nationwide network of branches and quick, reliable delivery, we serve customers across the country.All gaskets are precision-cut in-house at our joint venture (JV) facilities in Durban and Johannesburg. This capability ensures fast turnaround times and the availability of a comprehensive range of gasket materials to meet the exact requirements of manufacturers and end-users in virtually any application.The new joint venture has significantly expanded our production and supply capacity, cementing Sizonke Trading’s position as one of the leading suppliers of gasket materials in South Africa.

EPDM PTFE ENVELOPE GASKET STYLE 7700 EPDM PTFE Gasket is made of teflon for high temperature resistance, high strength.It is made by 100% Virgin PTFE with bonded with EPDM RubberThis can be avaliable for enough pressure. EPDM PTFE flange gasket has EPDM's advantage and also PTFE's advantage. Gasket has two sealing rings a primary and secondary. Almost universal chemical resistance and non-contaminating for ultra-oure applications, along with the EPDM memory giving a long sealing life.

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We offer high-quality pre-cut gaskets fabricated from a comprehensive selection of premium sheet materials, precisely matched to your specific application requirements — whether for aggressive chemicals, high-pressure steam, oils and fuels, water systems, or general industrial sealing. Materials include (but are not limited to): non-asbestos compressed fibre, rubber compounds (e.g., nitrile/NBR, EPDM, neoprene, silicone), flexible graphite, PTFE, and more — ensuring optimal performance, durability, and compatibility. With our efficient in-house cutting processes and extensive stock, we deliver fast turnaround times and seamless nationwide availability across South Africa — keeping your operations running smoothly with minimal lead times and reliable service.

We maintain comprehensive stock of all standard sizes of spiral wound gaskets, fully compliant with ASME B16.20 specifications across popular classes (150 to 2500) and nominal pipe sizes (NPS ½" to 24" and beyond). In addition, our spiral wound gaskets are readily available nationwide, offered in various high-performance materials such as:

Stainless steel (304, 316, etc.) windings with flexible graphite or PTFE fillers
Custom combinations including inner/outer rings for enhanced sealing in demanding environments

This ensures fast delivery...

Sizonke supplies many difference sealing gasket and sheet, e.g. PTFE gasket and sheet, PTFE joint sealant, PTFE envelop gasket, metal jacked graphite sheet, non asbestos sheet, graphite gasket and sheet, rubber sheet.

Modified PTFE improves on standard virgin PTFE by incorporating fillers (e.g., silica, glass microspheres, or barium sulfate) to reduce creep/cold flow, enhance compressibility, boost bolt torque retention, and maintain excellent chemical resistance across a wide pH range and temperatures (typically up to ~260°C).Colour Coding in Modified PTFE Gaskets Manufacturers often use colour to differentiate filler types or grades for easy identification in industrial, chemical, or sanitary applications:White/off-white → Commonly virgin or barium sulfate-filled (e.g., highly chemical-resistant grades like GYLON® 3510 or similar).Blue → Frequently glass microsphere-filled (e.g., for general chemical service with good compressibility).Pink → Typically silica-filled (e.g., for strong acids/alkalis, excluding hydrofluoric acid; seen in some European brands like certain modified PTFE lines).

A fishbone gasket (also known as Fishbone™ gasket, patented by AIGI Environmental) is an advanced, high-performance semi-metallic sealing gasket designed for critical flange applications in industries like oil & gas, petrochemical, chemical processing, and LNG terminals. It's engineered to provide superior leak prevention, low fugitive emissions, and long-term reliability compared to traditional options like spiral-wound gaskets or kammprofile (camprofile) gaskets.Key Design and FeaturesStructure: It features a unitary (one-piece) metal skeleton (typically stainless steel like 316) shaped like a fishbone or fish skeleton, with multiple concentric beveled/angled ribs on both sides. These ribs are rounded at the edges to avoid damaging flange faces.Sealing layers: The ribs are usually covered or coated with a soft, resilient non-metallic material such as graphite, PTFE (Teflon), or mica for chemical compatibility and sealing performance.Self-energizing: Internally pressurized by system fluid/media, which enhances sealing as pressure increases (creating separate "sealing chambers" that break down pressure gradients across the face).Advantages over alternatives:Extremely low leak rates (often the lowest tested, meeting high standards like TA-Luft for emissions control).No unwinding or flattening (unlike spiral-wound gaskets).Better resilience, bolt torque retention, and adaptability to pressure/temperature fluctuations.Interchangeable with spiral-wound or kammprofile gaskets in most flanges.Reduced emissions and improved equipment reliability in high-pressure/high-temperature environments.