Fluorine Rubber JHF26 Series: Reliable Performance in Extreme Environments (Symb ChemTech)

Introduction:

In industries where materials are subjected to extreme temperatures, aggressive chemicals, and harsh operating conditions, selecting the right elastomer is crucial. Symb ChemTech’s JHF26 series of fluorine rubber (FKM) copolymers provides a robust solution for sealing, gasketing, and other critical applications. Synthesized through the copolymerization of vinylidene fluoride (VDF) and hexafluoropropylene (HFP), these elastomers offer a reliable performance in demanding environments.

Key Features and Benefits:

The JHF26 series, with a fluorine content of 66%, offers a balanced set of properties:

• Excellent Oil Resistance: Highly resistant to various oils, including fuel oil, synthetic oil, and lubricating oil.
• High-Temperature and Heat Resistance: Maintains its properties at elevated temperatures.
• Good Mechanical Properties: Provides adequate strength, elongation, and flexibility for demanding applications.
• Wide Range of Mooney Viscosity: Available in various grades with different Mooney viscosities to suit different processing methods.

JHF26 Series Grades:

Symb ChemTech offers several grades within the JHF26 series, each with specific Mooney viscosity ranges:

• JHF2601L: Low Mooney viscosity (5-15) for easy processing.
• JHF2601: Medium-low Mooney viscosity (15-40).
• JHF2602: Medium Mooney viscosity (41-60).
• JHF2605: Medium-high Mooney viscosity.
• JHF2603: High Mooney viscosity (61-100).
• JHF2604: Very high Mooney viscosity (101-160).
• JHF2604G: Extremely high Mooney viscosity (161-200).

This range allows for optimized processing based on the specific manufacturing requirements.

Technical Specifications (Summary):

(Please refer to the full product datasheet for complete technical details.)

Applications:

The JHF26 series is widely used in applications requiring high temperature and fluid resistance:

• Aerospace: Seals, gaskets, O-rings, hoses, and cable jackets in aircraft and spacecraft.
• Automotive: Fuel system components, seals, and gaskets exposed to high temperatures and aggressive fluids.
• Industrial: Seals, gaskets, diaphragms, and hoses in various industrial equipment.
• Other Applications: Gasket rings, V-shaped bodies, skeleton oil seals, heat insulation cloth, valves, expansion joints, cots, coatings, and room temperature vulcanized putty.

Handling and Safety Precautions:

Fluorine rubber raw rubber is stable below 260°C. However, decomposition occurs at temperatures between 260-300°C, accelerating significantly above 320°C. The main decomposition products are toxic hydrogen fluoride and fluorocarbon organic compounds. Avoid open flames and incompatible materials such as metal powders (aluminum, magnesium) and high concentrations (over 10%) of amine compounds, as violent reactions can occur. Always consult the safety data sheet (SDS) for detailed handling and safety information.

Packaging and Storage:

The product is packaged in polyethylene film bags (5kg each) within hard cartons (25kg net content). Store in a clean, cool, and dry place, protected from rain, sun, moisture, dust, and other impurities. Transport carefully to avoid moisture and vibration.

Conclusion:

Symb ChemTech’s JHF26 series of fluorine rubber copolymers offers a reliable and cost-effective solution for demanding applications requiring excellent oil, heat, and chemical resistance. With a wide range of Mooney viscosities available, the JHF26 series can be tailored to meet diverse processing needs.

Fluorine rubber, an indispensable material in modern industrial applications, plays a pivotal role in sectors demanding high-performance elastomers. Symb ChemTech proudly presents the JHF26 Series, a high-quality fluorine rubber solution designed to meet the rigorous demands of advanced industries such as aerospace, automotive, and chemical processing.

Overview of JHF26 Series

The JHF26 Series, a copolymer elastomer synthesized from vinylidene fluoride (VDF) and hexafluoropropylene (HFP), boasts a fluorine content of 66%. This high fluorine content ensures the rubber’s exceptional resistance to extreme temperatures, aggressive chemicals, and mechanical wear. As a result, JHF26 excels in applications requiring outstanding heat resistance, chemical stability, and durability.

The series is available in multiple grades, including JHF2601L, JHF2601, JHF2602, JHF2605, JHF2603, JHF2604, and JHF2604G, catering to diverse technical requirements.

Key Technical Properties

The JHF26 Series offers remarkable mechanical and chemical properties:

• Raw Rubber Characteristics:
  • Appearance: White or yellowish sheet.
  • Specific Gravity: Ranges between 1.80 and 1.84 g/cm³.
  • Mooney Viscosity: Varies from 5 to 200, depending on the grade.
• Vulcanized Fluorine Rubber:
  • Compression Set (200°C × 70h): ≤ 20%.
  • Tensile Strength: ≥ 11 MPa.
  • Elongation at Break: ≥ 150%.
  • Hardness: 70–85 Shore A.
  • Exceptional solvent resistance with minimal mass change (≤ 5%).

These properties make the JHF26 Series a reliable material for applications that demand superior mechanical strength and chemical resistance.

Applications

The versatility of the JHF26 Series enables its use in a wide range of applications:

1. Fuel Resistance: Ideal for automotive and aviation fuels, offering resistance to all synthetic oils and non-polar solvents.
2. Chemical Resistance: Withstands acids, alkalis, oxidizing agents, ozone, and radiation.
3. High-Temperature Stability: Performs reliably in environments up to 260°C, with applications including gaskets, O-rings, V-rings, hoses, and seals.
4. Advanced Engineering: Used in diaphragms, heat insulation clothing, and valve linings for aerospace and industrial needs.

Cautions for Use

To maximize the performance and longevity of the JHF26 Series, users must adhere to specific precautions:

• Avoid exposure to temperatures above 260°C for prolonged periods, as decomposition can release toxic compounds such as hydrogen fluoride.
• Refrain from mixing the material with metal powders (e.g., aluminum or magnesium) exceeding 10% content, as this may lead to violent reactions.
• Prevent contact with open flames to ensure safety during usage and handling.

Packaging and Storage

Symb ChemTech ensures the JHF26 Series is packaged with precision and care:

• Each batch is securely packed in polyethylene film bags, loaded into carton boxes for stability during transport.
• For optimal storage, keep the material in a clean, cool, and dry environment, avoiding moisture, dust, and exposure to sunlight.

The Fluorine Rubber JHF26 Series by Symb ChemTech represents a pinnacle of innovation in elastomer technology. Its exceptional properties make it indispensable in industries requiring high-performance materials. With its outstanding resistance to heat, chemicals, and mechanical stress, the JHF26 Series is the go-to solution for engineers and manufacturers worldwide.

Fluorine rubbers, also known as fluoroelastomers, are a class of synthetic elastomers renowned for their exceptional resistance to harsh environments. Among these, the JHF26 series from Symb ChemTech stands out for its versatile performance profile, making it a crucial material in various high-tech industries. This article provides a comprehensive overview of the JHF26 series, highlighting its properties, applications, and handling considerations.  

Chemical Composition and Properties:

The JHF26 series is a copolymer of vinylidene fluoride (VDF) and hexafluoropropylene (HFP), with a fluorine content of 66%. This high fluorine content is the key to its outstanding resistance to chemicals, high temperatures, and oxidative degradation. The series comprises several grades (JHF2601L, JHF2601, JHF2602, JHF2603, JHF2604, JHF2604G, and JHF2605), each tailored for specific processing and performance requirements, primarily differentiated by Mooney viscosity.

Key properties of vulcanized JHF26 series rubbers include:

• Excellent Oil and Fluid Resistance: Resists degradation from a wide range of fuels (aviation and automotive), synthetic oils, lubricating oils, and non-polar solvents.
• High-Temperature Resistance: Maintains mechanical properties at elevated temperatures, with long-term stability up to 260°C and short-term resistance to even higher temperatures.  
• Good Mechanical Properties: Exhibits satisfactory tensile strength and elongation at break, ensuring durability in demanding applications.
• Chemical Resistance: Withstands exposure to acids, alkalis, strong oxidants (like fuming sulfuric acid), and ozone.
• Weathering and Radiation Resistance: Resists degradation from UV radiation, ozone, and atmospheric exposure.

Grades and Their Characteristics:

The different grades within the JHF26 series offer a range of Mooney viscosities, influencing processability and final product properties. Lower Mooney viscosity grades (like JHF2601L and JHF2601) are easier to process, while higher viscosity grades (like JHF2604G) offer improved green strength and can be advantageous in certain molding applications. The provided data sheet emphasizes the use of bisphenol AF as a vulcanizing agent in their testing, which is a common practice for FKM.

Applications:

The exceptional properties of the JHF26 series make it indispensable in numerous demanding applications, including:

• Aerospace: Seals, gaskets, O-rings, hoses, and fuel system components in aircraft and spacecraft.
• Automotive: Seals, gaskets, O-rings, hoses, and fuel system components in vehicles, especially those exposed to high temperatures and aggressive fluids.
• Chemical Processing: Seals, gaskets, and linings in equipment handling corrosive chemicals.
• Oil and Gas: Seals, gaskets, and downhole tools in exploration and production environments.
• Industrial Equipment: Seals, gaskets, and hoses in various industrial applications requiring resistance to harsh environments.

Specific examples include gaskets, O-rings, V-shaped packings, oil seals, diaphragms, hoses, cable jackets, heat insulation cloth, valves, expansion joints, and coatings.

Handling and Safety Precautions:

While JHF26 series rubbers exhibit excellent stability below 260°C, certain precautions must be observed:

• Thermal Decomposition: At temperatures above 260°C, slow decomposition begins, accelerating significantly above 320°C. The primary decomposition products are toxic hydrogen fluoride (HF) and fluorocarbon organic compounds.
• Open Flame: Contact with open flames will also release toxic HF and fluorocarbon compounds.
• Incompatible Materials: Avoid mixing with metal powders (e.g., aluminum, magnesium) or more than 10% amine compounds, as this can lead to exothermic reactions and potential hazards.

Packaging, Storage, and Transportation:

Symb ChemTech provides clear packaging with proper labeling and documentation. The rubber is typically supplied as sheets interleaved with release film, packaged in polyethylene bags, and then placed in cartons. Storage should be in a clean, cool, and dry environment, protected from rain, sunlight, moisture, and dust. Transportation should avoid moisture and excessive vibration.

The JHF26 series of fluorine rubbers from Symb ChemTech offers a versatile range of high-performance elastomers suitable for demanding applications across various industries. Their exceptional resistance to high temperatures, chemicals, and harsh environments makes them crucial for ensuring reliability and longevity in critical systems. By understanding their properties, applications, and handling precautions, engineers and designers can effectively utilize these materials to achieve optimal performance in their respective fields.

For more information or inquiries about the JHF26 Series, contact Symb ChemTech today!