Superior Fuel Resistance FKM(Bisphenol Cured)BDHT series Fluoroelastomer
Overview
BDHT Series: 70% High-Fluorine FKM Compounds for Superior Alcohol-Fuel Resistance
The BDHT Series (High-Fluorine FKM Compound) represents a specialized class of bisphenol-curable terpolymers engineered with an ultra-high fluorine content of approximately 70%. Specifically designed to outperform standard FKMs, the BDHT series offers exceptional resistance to alcohol-containing fuels (Flex-Fuel) and aggressive chemical environments. With GMN8423 Type II compliance and a precision-balanced formula, these compounds deliver superior mold flow, rapid mold release, and unmatched dimensional stability. Whether for high-volume O-ring injection or complex gasket compression molding, the BDHT series ensures a reliable seal under extreme temperatures from -15°C to +230°C, making it the premier choice for modern automotive fuel systems and industrial fluid handling.
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Superior Fluid Barrier
The 70% fluorine terpolymer backbone provides a significantly denser chemical shield against Methanol, Ethanol, and Fuel C than standard 66% fluorine grades.
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Optimized Processing Efficiency
Engineered for excellent mold flow and release, which minimizes cycle times and drastically reduces scrap rates in high-speed production.
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GMN8423 Type II Compliance
Specialized grades (like BDHT-LG3651Y) meet rigorous automotive OEM specifications for durability and permeation resistance.
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Versatile Hardness & Color Coding
Available in Black, Brown, and Green with hardness ranging from Shore A 58 to 74, allowing for easy part identification and mechanical customization.
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Exceptional Compression Set
Maintains sealing force over long-term exposure to high-heat and aggressive fluids, preventing leaks in critical assemblies.
Material & Manufacturing Process
- Advanced Compounding: BDHT compounds are pre-mixed under vacuum to eliminate air entrapment, ensuring a homogeneous curative dispersion for consistent physical properties.
- High-Purity Terpolymer: Formulated using premium VDF/TFE/HFP terpolymers to achieve the critical 70% fluorine threshold required for modern fuel compatibility.
- Remix-Ready: Designed to be easily refreshed via a quick pass on a two-roll mill to restore optimal plasticity before molding.
Solutions & Application Scenarios
- Automotive Fuel Systems: Low-permeability hoses and injector O-rings handling ethanol-blended fuels and modern additives.
- Oil & Gas Industry: High-viscosity seals (BDT651P) designed to withstand high pressure and aggressive drilling fluids.
- Aerospace & Defense: BDTL Seriessolutions for sealing components that must remain flexible at high altitudes and sub-zero temperatures.
- Chemical Engineering: Gaskets and pump liners requiring the improved barrier properties of a 68-70% fluorine terpolymer.
Molding Methods
Optimized for Compression, Injection, Transfer molding, Extrusion, and Calendering.
Cure Efficiency
Designed for a standard press cure (typically 170°C–180°C) with the ability to achieve full properties through a streamlined post-cure cycle.
Pro-Tip
For the best surface finish in complicated molds, re-mix (re-mill) the compound prior to molding to ensure optimal flow and air release.
Product Specifications
| Grade | Mechanical Properties | Heat Aging 250℃×70h | FUEL C Resistance 23℃x70hrs | Low Temperature Resistance | Processing Method | Descriptions & Features | Typical Uses | |||||||||||||
| Specific Gravity g/cm3 | Hardness Shore A | Tensile Strength MPa | Elongation at Break % |
Compression Set % 200℃×70h |
Change in Hardness | Change in Tensile % | Change in Elongation % | Change in Hardness | Change in Tensile % | Change in Elongation % | Change in Volume % | Brittle Temperature ℃ | Compression | Transfer | Injection | Extrusion | Bonding | |||
| BDT: bisphenol curable terpolymers. The first letter before the numbers: H - black, KK-brown, KR-Red，LG-Green，LB-Blue; The first number: recipe code; The second number and the third number: Hardness; The last number: requirements: 1-low compression set, 2-good hot tear, for complicated geometry | ||||||||||||||||||||
| BDHT-H3601 | 1.99 | 63 | 11.8 | 290 | 38 | 1 | 4 | 6 | -1 | -4 | -6 | 1 | -35 | O | O | O | O | Excellent mold flow, mold release, superior resistance to the fuel containing alcohols | O-rings, gaskets and other molded parts | |