DONIT TESNIT - Standard and Custom-Made Gaskets

DONIT TESNIT® enjoys an unparalleled reputation among the world's leading producers of sealing materials. DONIT is a well-established brand name that offers top quality (ISO 9001:2000), excellent customer service and a consistent environmental policy (ISO 14001:2004).

Spiral wound gaskets

Spiral wound gaskets are special semi-metallic gaskets that are very suitable for applications featuring heavy operating conditions. Spiral wound gaskets can be used for sealing flange joints, manhole and handhold covers, tube covers, boilers, heat exchangers, pressure vessels, pumps, compressors and valves. They are used in the petrochemical, pharmaceutical, shipbuilding, food processing and power industry, as well as in nuclear power stations.

Metal-jacketed gaskets

Metal-jacketed gaskets are particularly suitable for sealing flat surfaces of heat exchangers, gas pipes, cast iron flanges, autoclaves and similar equipment. Thanks to their sealing efficiency, metal-jacketed gaskets can stand up to 30% of deviation from the initial thickness, which is very useful in case of irregular or faulty flange rims.

Heat exchanger gaskets

DONIT TESNIT heat exchanger gaskets come in a broad spectrum of types, including single or double-jacketed, corrugated, plain metal, soft and many others. A large selection of different materials allows heat exchangers to operate at temperatures beyond the capabilities of most soft gasket materials.

These gaskets are used in shell and tube type heat exchangers. They can be manufactured in different sizes and shapes, with or without bars.

Grooved metallic gaskets

Grooved metallic gaskets feature excellent anti-blowout properties linked with the reliability of a solid metal-to-metal seal combined with a soft sealing face to provide a tighter joint.

Grooved metallic gaskets are very effective for sealing flange connections, and are particularly suitable for applications where high temperatures, pressures and fluctuating conditions are encountered. The DONIT TESNIT grooved gasket can be used as an alternative for applications associated with jacketed gaskets (for heat exchangers, vessels and reactors and various flanged connections).

Ring joint gaskets

Metallic ring joint gaskets are manufactured according to the API 6A and ASME B16.20 standards for applications at elevated temperatures and pressures. The small sealing area with high contact pressure results in great reliability. Some types of ring joints are pressure activated, which means that the higher the pressure better the sealability.

The DONIT TESNIT ring joint gaskets are produced in several shapes and sizes to meet the most demanding applications.

Corrugated metal gaskets

Corrugated metal gaskets are reliable and cost-effective for application on flanges and heads where boat loading is sufficient. They are used in applications which require mechanical strength, thermal conductivity, as well as temperature and corrosion resistance. They are particularly useful when compressibility is not a factor and where sufficient clamping force is available.

Corrugated metal gaskets feature good mechanical strength and excellent heat transfer and resistance to high temperatures and pressures.

Non-metallic flat gaskets

The DONIT TESNIT non-metallic or flat gaskets are used in large numbers by various industries and in a variety of applications. The TESNIT soft gaskets are made of non-asbestos (CSF), graphite, PTFE, mica, aramide / graphite and rubber sealing materials. Both standard and non–standard gasket designs are available.

The DONIT TESNIT non-metallic gaskets are produced in several sizes and shapes to meet the most demanding applications.

Metal eyeleted flat gaskets

Metal eyeleted flat gaskets offer special protection against blowout for the sealing of critical or dangerous media. The good malleability grade of the austenitic stainless steel means that metal eyeleted flat gaskets have excellent mechanical properties and good resistance to erosion, while the well-known resistance to heat and to corrosion ensures the long working life of the seal.

PTFE gaskets

PTFE gaskets are one of the most suitable types of gaskets for a variety of sealing applications. Expanded PTFE gaskets and seal materials consist of virgin PTFE with a multidirectional fibrous and/or porous structure, while the extruded PTFE consists of a special manufacturing process that provides the material with special chemical and physical properties. This can be of advantage in a wide range of the applications.

Custom-made gaskets

In close co-operation with its customers DONIT TESNIT develops and produces custom-made gaskets for various applications. Gaskets can be produced in sizes up to 4,000mm. These custom-made gaskets have a unique and strong construction, which allows easy handling and transportation. Depending on the material used, DONIT TESNIT's custom-made gaskets can have a temperature resistance up to 700°C.