Same Fluorosilicone Elastomer Family, Different Processing Paths
Addition-cure liquid fluorosilicone rubber and platinum-cure solid fluorosilicone rubber are both based on fluorosilicone polymers containing trifluoropropyl side chains. They share properties such as oil resistance, solvent resistance, wide-temperature stability and low surface tension. The key difference lies in their initial form and molding method.
Addition-cure liquid fluorosilicone rubber is typically a two-component liquid system that undergoes hydrosilylation under platinum catalysis, transforming from liquid to elastomer. Due to its liquid initial state, it is suitable for injection molding, potting and filling complex structures, with good dimensional stability after curing.
Platinum-cure solid fluorosilicone rubber is typically a compounded or pre-mixed solid compound that requires heat and pressure for molding via compression or transfer molding. Due to its solid initial state, it is better suited for compression molding, transfer molding and production of seals with relatively fixed shapes.
In short, liquid fluorosilicone rubber is better for "flow molding and precision filling," while solid fluorosilicone rubber is better for "compression molding and structural part production."
Addition-Cure Liquid Fluorosilicone Rubber: Preferred for Injection and Potting
Addition-cure liquid fluorosilicone rubber typically consists of vinyl-containing fluorosilicone polymer, hydrogen-containing fluorosilicone crosslinker and platinum catalyst. Upon mixing and heating, hydrosilylation occurs, forming a crosslinked network. Since no small-molecule byproducts are generated during curing, shrinkage is low, making it suitable for precision molding.
The liquid system offers good flowability, enabling rapid filling of complex molds through injection equipment. It is suitable for thin-wall parts, multi-cavity parts and irregular seals. It can also be used for fluorosilicone potting applications, protecting electronic components, sensors or connectors against oil and media exposure.
Typical applications include:
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Injection-molded fluorosilicone seals
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Complex oil-resistant sealing
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Fluorosilicone potting compounds
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Electronic component media protection
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Fuel system sealing
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Precision fluorosilicone parts
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Low-shrinkage molding applications
When customers mention injection molding, liquid injection, potting, complex structure filling or low-shrinkage molding, they are usually closer to addition-cure liquid fluorosilicone rubber applications.
Platinum-Cure Solid Fluorosilicone Rubber: Common Choice for Compression Molding and Automotive Parts
Platinum-cure solid fluorosilicone rubber is typically a pre-mixed solid compound that can be vulcanized under heat in a platinum-catalyzed system. Compared with traditional peroxide-cured systems, platinum-cure systems generally offer lower compression set and more stable media resistance, making them suitable for applications requiring high sealing reliability.
Solid compounds are suitable for compression molding and transfer molding, and can be processed via平板 vulcanizing presses, injection-compression machines or compression molds. Since the compound has a certain shape and hardness before molding, it is suitable for producing O-rings, gaskets, valve diaphragms, automotive seals and fluorosilicone parts with relatively fixed geometries.
Typical applications include:
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Compression-molded fluorosilicone seals
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Automotive fluorosilicone parts
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O-rings and gaskets
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Valve diaphragms and membranes
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Fuel system seals
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Oil- and solvent-resistant elastomers
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Compression-molded fluorosilicone parts
When customers mention compression molding, transfer molding, automotive seals, O-rings, gaskets or fixed-shape parts, they are usually closer to platinum-cure solid fluorosilicone rubber applications.
IOTA FLSR3400 addition-type liquid fluorosilicone rubber
