Kalrez® o ring

FFKM O-rings (perfluoroelastomer) are top-class seals that combine the flexibility of elastomers with the extreme chemical resistance of fluoroelastomers. Thanks to their unique molecular structure, they exhibit exceptional resistance to aggressive chemicals, solvents, acids, bases, and high temperatures, up to +320°C.

At Power Rubber, we offer high-quality FFKM Kalrez® o-rings and seals that are used in the chemical, petrochemical, pharmaceutical, and aerospace industries, where standard seals fall short. They are characterized by minimal permanent deformation, ensuring long-term reliability even in the most demanding applications.

In our wide range, you will also find Kalrez® rubber sheets for critical applications in various industrial sectors.

FFKM O-rings are also a type of seals designed for high temperatures. The temperature range ends even at +320 degrees Celsius. They stand out for their excellent resistance to aggressive chemicals, solvents, acids, and bases, making them an indispensable solution in the chemical, petrochemical, and aerospace industries.

Thanks to low permanent deformation and exceptional thermal stability, FFKM O-rings provide long-lasting sealing and minimize the risk of failure even in the most demanding applications where standard elastomers fall short.

Technical seals made of a blend of FFKM are available on the market under the following names:

• FFKM
• Kalrez®
• Isolast®
• Paroflour®
• Simriz®
• Chemraz®
• Perlast®
• Hifluor®

If you need FFKM o-rings, one of the strongest available on the market are Perlast® o-rings. High-temperature seals perform properly even at the highest temperatures, up to +327°C. The material is available in certified variants:

• FDA
• USP

These types of seals are dedicated to industries such as:

• Pharmaceuticals
• Food production
• Dairy production
• Oil and fuel industry

Perfluoroelastomer o-rings are also available in a low-temperature variant.

In the chemical, pharmaceutical, and automotive industries, selecting the appropriate elastomer for the working conditions is crucial for the durability, efficiency, and sealing of the system. The most commonly used materials are FKM Viton® and FFKM Kalrez®, both belonging to the group of fluoroelastomers. Both rubber compounds offer high thermal and chemical resistance, but differ in structure and the extent of this resistance

.

Difference between FKM and FFKM, Viton® and Kalrez® O-rings

 FKM Viton® is a fluororubber that offers resistance to oils, fuels, ozone, and most organic chemicals, operating in a temperature range from -25°C to +200°C. FKM Viton® rubber O-rings are sealing rings that, due to their properties, find applications in automotive, aviation, hydraulics, and in all applications requiring a combination of chemical compatibility with flexibility at high temperatures. FFKM Kalrez® is a perfluoroelastomer known for its extremely high resistance to aggressive chemicals and temperature stability up to +330°C. It performs well in critical applications in the chemical, automotive, aerospace, pharmaceutical, and food industries, where purity, good mechanical resistance, and maximum durability are essential. FKM O-rings have a working range up to +200°C, while FFKM O-rings provide a higher level of temperature resistance up to +330°C, making them an excellent sealing solution in extreme conditions. Kalrez® O-rings ensure reliable, faultless sealing and long service life.

Perfluoroelastomers are used in the most demanding industrial processes. Among the leading materials in this class are DuPont's Kalrez® and Precision Polymer Engineering's Perlast®. Both belong to the group of perfluoroelastomer rubbers FFKM, but differ in composition, temperature range, and resistance to various environmental factors.

Perfluoroelastomer FFKM is a high-performance material known for its exceptional chemical resistance and thermal stability. It serves as a reliable sealing solution critical in extreme working environments. FFKM seals and O-rings are specialized seals designed to operate in aggressively chemical and high-temperature environments, enduring long-term exposure without the risk of degradation due to their physicochemical properties.

Key properties of FFKM perfluoroelastomer:

• exceptional chemical resistance (withstanding over 1600 different chemical substances)
• non-degradative under the influence of, among others, ketones, oxidizers, fuels, acids, and bases
• resistance to moisture and environmental aging
• maintaining seal integrity and mechanical stability
• mechanical strength (FFKM material is resistant to compression and elongation, enduring continuous mechanical stresses, preventing tearing, and recovering its original shape after pressure release)
• high thermal durability (FFKM retains its properties, dimensional stability, and sealing in a wide temperature range)

Kalrez® vs. Perlast®

Kalrez® perfluoroelastomers (e.g., 7075, 4079) are designed for use in environments requiring reliable, long-term operation. The material offers the highest chemical resistance (resistant to over 1800 chemical substances) and thermal resistance (wide temperature range from -55°C to +330°C). With high mechanical strength, Kalrez perfluoroelastomer does not degrade due to stretching, abrasion, and mechanical stresses. It is used in high-temperature chemical, oil & gas, pharmaceutical, food, semiconductor, mining industries, and can also be used in vacuum conditions.

Perlast® perfluoroelastomers (e.g., G74S, G75LT) are developed for use in the most aggressive environments and high liquid temperatures. It is a high-performance alternative to Kalrez® perfluoroelastomer. The material features excellent mechanical resistance, universal chemical resistance, and temperature resistance from -45°C to +327°C. It is used in a wide range of critical sealing applications in food, dairy, biomedical, pharmaceutical, oil & gas industries.

Kalrez® provides the highest chemical resistance, including strong acids, oxidizers, and steam. Perlast® stands out for greater flexibility and excellent resistance to plasma. The choice of the appropriate perfluoroelastomer depends on the type of medium, process cleanliness, and temperature range of operation.

Kalrez® and Chemraz® belong to the family of perfluoroelastomers. 

Chemraz® is a perfluoroelastomer from Greene Tweed. The material is suitable for the most challenging industrial applications, providing reliable sealing at high operating temperatures (up to +315°C), in the presence of steam and in contact with aggressive chemicals. It is suitable for applications exposed to aggressive plasmas, fluorine, oxygen, and all drilling fluids. Perfluoroelastomer Chemraz® is an efficient sealing solution for pumps, valves, analytical instruments, compressors, and drilling tools. It is used in the semiconductor, pharmaceutical, aerospace, energy, and defense industries. Chemraz® is a more cost-effective alternative to Kalrez®.

Kalrez® is a perfluoroelastomer from DuPont™. The material is designed for critical applications requiring extreme resistance to aggressive chemicals and high temperatures (up to +330°C). It offers better chemical and thermal resistance than Chemraz®. Additionally, Kalrez® is a sealing solution for applications where high performance and durability are essential.

Kalrez® is a high-performance perfluoroelastomer FFKM developed by DuPont™. As mentioned earlier, it is designed to operate in the most aggressive and high-temperature environments.

Chemical Resistance Kalrez®

Kalrez® offers exceptional resistance to a wide range of temperatures and the highest chemical resistance compared to other elastomeric materials. The material is resistant to over 1800 chemicals, including organic and inorganic acids, strong bases, ketones, amines, esters, hydrocarbons, oxidizing agents, and water vapor. It also shows resistance to oxygen, ozone, and aging in atmospheric conditions. The material's chemical resistance also includes low mass loss in vacuum and high-temperature conditions.

The standard thermal resistance of perfluoroelastomer FFKM rubber ranges from -50°C to +310°C. Depending on the specific blend, Kalrez® FFKM o-rings can have different temperature ranges for operation. FFKM o-rings maintain their flexibility and dimensional stability at high temperatures.

Types of Kalrez® - Temperature Range for Operation

• Kalrez® 0040 -42°C to +220°C
• Kalrez® 0090 up to +250°C
• Kalrez® 150LF up to +288°C
• Kalrez® 3018 up to +288°C
• Kalrez® 4079 up to +316°C
• Kalrez® 6221 up to +260°C
• Kalrez® 6375 up to +275°C
• Kalrez® 6380 up to +225°C
• Kalrez® 7075 up to +327°C
• Kalrez® 7090 up to +325°C
• Kalrez® 9100 up to +300°C

If you are wondering where to buy original Kalrez® o-rings, we invite you to visit our Power Rubber store. In our assortment, we have FFKM Kalrez® o-rings designed for the most demanding chemical and thermal conditions.

Power Rubber collaborates with DuPont™ Kalrez® as an authorized distributor. By using our offer, you can be sure that the purchased FFKM rubber o-rings have certified DuPont™ quality, are resistant to temperatures up to around +330°C, offer chemical resistance to over 1800 substances, low permanent deformation, and reliable, long-lasting sealing.

Yes, FFKM Kalrez® is a perfluoroelastomer manufactured by DuPont®. FFKM Kalrez® is available in various types, each characterized by exceptional chemical resistance and varying high-temperature resistance. Kalrez® seals are designed to work in extreme conditions where standard elastomers fail. It has been mentioned multiple times that the material is resistant to over 1800 chemicals and can withstand temperatures up to +330°C. Different types of Kalrez® allow for the adaptation of suitable seals to temperature and chemical environment, ensuring reliability, trouble-free operation, and long service life.

Power Rubber collaborates with DuPont®, offering original O-rings and seals of FFKM Kalrez®. We guarantee professional technical advice, ensuring the appropriate material selection for specific applications and environmental conditions.