BACK-UP RINGS
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AUTOMOTIVE  I AEROSPACE  I FOOD & BEVERAGE I  FLUID TECHNOLOGIES  I MOBILE MACHINERY O'RINGS BACK-UP

4 Site n°1: Compression Molding – Injection Molding – Water Jet Cutting – Finition – Quality Control – Logistics Site N°2: Administrative Area – Research & Development – Machining – Tooling Since 1981, FRANCE JOINT – SEALING SYSTEMS has been designing, manufacturing and distributing seals and precision rubber parts for its customers for whom quality is a determining factor. Faced with tough competition among the big decisionmakers of the industrial world, FRANCE JOINT has responded with innovation, research and development, experience in Best-Cost manufacturing, and a consistently high...

RESEARCH & DEVELOPMENT Innovation, reliability, safety, minimization of risk: your expectations are our daily concern. To get from the idea to the finished product demands firm managerial control over a wide range of projects in addition to expertise in manufacturing. FRANCE JOINT’s contributors, who are as much inventors as technicians, get the best of fully automated, state-of-the-art technology that takes them from drawing-board to prototype and finally to assembly line. From writing specifications to putting on a major technical event through designing (3D Solidwrks software) and...

Description O'Rings, because of their simple shape and efficiency, have been used for a number of years in diverse industrial applications - valves, industrial engines, medical equipment, agricultural equipment and construction machinery, machine tools, etc. In short, in situations where a compact design is required for a good sealing effect. These O'Rings are made from very varied chemical synthetic rubber: ACM, AEM, EPDM, FKM, HNBR, NBR, VMQ, which provides a large selection of materials that are chemically compatible with a wide range of products and fluids. The dimensions of the housing...

RUBBERS The table below provides an overview of the different rubber families. ACM (Polyacrylate) Polymers containing ethyl acrylate (or butyl acrylate) have a small amount of monomer, which is necessary for crosslinking; ACM is a material with better heat resistance than NBR. It is often used for automatic gearboxes. Chemical resistance Mineral oils (motor oils, gear box oils, ATF oils) Atmospheric and ozone agents Compatibility issue Glycol-based brake fluids (Dot 3 & 4) Aromatic and chlorinated hydrocarbons Water and steam Acids, alkalis and amines Temperature range -25°C /...

AEM (ethylene acrylate rubber) As a methyl acrylate and ethylene copolymer, AEM is considerec characteristics make it an intermediary between the ACM and FKM. Compatibility issue Cooling fluids Aggressive mineral oils Atmospheric agents Water Aromatic solvents Strong acids Brake fluids Gearbox oils ATF oils CR (Polychloroprene) This CR-based elastomer is used in the refrigeration industry and for ventilation systems. This chloroprene was the first synthetic rubber to be developed and marketed. Chemical resistance Paraffinic mineral oils Silicone oils and greases Water and water-based...

}} FFKM (perfluorinated rubber) FFKM has the best resistance to high temperatures and an excellent chemical inertia. This FKM-based rubber is very often used for high-temperature hydraulic and pneumatic systems, industrial valves, injection/fuel systems, motor seals and high-vacuum systems. Aliphatic and aromatic hydrocarbons Polar solvents (ketones, esters and ethers) Organic and inorganic acids Water and steam High-vacuum system Compatibility issue Temperature range }} FKM (fluorinated rubber) Depending on their structure and fluorine content, fluoroelastomers can vary in terms of...

HNBR (Hydrogenated Nitrile Butadiene Rubber) This HNBR-based elastomer is obtained through selective hydrogenation of the NBR's butadiene groups. It is commonly used for power-assisted steering and for air conditioning. Chemical resistance Aliphatic hydrocarbons Mineral and vegetable oils and greases Fire-resistant fluids (HFA, HFB and HFC) Diluted acids, saline solutions and bases for operation at an average temperature Water and steam up to +150°C Atmospheric and ozone agents Compatibility issue Chlorinated hydrocarbons Polar solvents (ketones, esters and ethers) Strong acids...

CHEMICAL COMPATIBILITY A "Chemical compatibility guide" catalogue can be downloaded from our website: www.francejoint.com You can also use our online "Chemical compatibility" tool free of charge. These two tools enable you to measure the behaviour of our materials that come into contact with the majority of existing fluids. The data displayed is the result of rigorous testing at the ambient temperature and takes previous publications into consideration. Test results are not fully representative because of the specific features of your application. The tests performed actually do not...

b. Compression Set (CS) The Compression Set (CS) is a method that measures the ability of rubbers to maintain their elastic properties at specific temperatures following prolonged compression under consistent deformation, in line with standards ISO 815 / ASTM D 395. WHERE: •  0: initial thickness of the O'Ring e •  1: thickness under compression with specified conditions e (temperature, fluid, duration, deformation rate) •  2: thickness after tension release e e2 = e0; the material has perfect elasticity e2 = e1; the material has a complete permanent plastic deformation The lower the CS,...

e. Volume change Chemical resistance is a decisive criteria when it comes to selecting an appropriate material. That's why it is essential to be aware of the liquids or gases used in the application, as this will affect the operation of the material as well as the service temperature. Moreover, hardening or softening, loss of stiffness or elasticity, loss of tension, deformation relaxation and changes in volume through swelling or shrinkage can be ascertained using the volume change test, in line with standards ISO 1817 / ASTM D 471. These tests are carried out either in the actual...