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Excellent resistance to fuels, oils, and aggressive hydrocarbon-based chemicals.
Broad operating temperature range from –65 °C to +200 °C for long-term service stability.
Superior compression set resistance compared to standard silicone elastomers.
Good low-temperature flexibility and retention of physical properties after thermal aging.
Fluorosilicone chemistry provides enhanced compatibility with aerospace and automotive fluid systems.
Aerospace fuel system seals and gaskets exposed to jet fuels and hydraulic fluids.
Automotive turbocharger hose liners and sensor seals in high-temperature under-hood environments.
Oil and gas downhole instrumentation seals requiring resistance to sour gas and condensates.
Military-grade avionics enclosures and environmental sealing components.
Specialty industrial diaphragms and membranes handling aggressive solvents or lubricants.
| Chemical Type | Fluorosilicone elastomer (FVMQ) |
| Product Form | Two-part liquid silicone rubber (LSR), platinum-cured |
| Appearance | Translucent to light amber viscous liquid (Part A); colorless to pale yellow catalyst (Part B) |
| Primary Applications | High-performance static and dynamic seals in demanding fluid environments |
| Key Features | Fuel/oil resistance, thermal stability, low compression set, low-temperature flexibility |
| Benefits | Extended service life in harsh chemical and thermal conditions; reduced maintenance and replacement frequency |
| Curing System | Pt-catalyzed addition cure (hydrosilylation) |
| Shelf Life | 12 months at 25 °C when stored unopened in original packaging |
Q1: What are the key advantages of Dow SILASTIC LS 5-2040 over standard silicone rubbers?
A: Dow SILASTIC LS 5-2040 combines the thermal stability and flexibility of silicone elastomers with enhanced resistance to fuels, oils, solvents, and polar chemicals—thanks to its fluorosilicone backbone. This makes it particularly suitable for demanding aerospace, automotive, and industrial sealing applications where standard silicones may swell or degrade.
Q2: Is Dow SILASTIC LS 5-2040 suitable for high-temperature dynamic sealing applications?
A: Yes—it maintains excellent compression set resistance and mechanical integrity at continuous service temperatures up to 200 °C, and short-term exposure up to 230 °C. Its fluorosilicone chemistry helps preserve sealing performance under thermal cycling and mechanical stress in critical dynamic environments.
Q3: How is Dow SILASTIC LS 5-2040 typically processed?
A: It is a two-part, platinum-cured liquid silicone rubber (LSR) formulated for high-speed injection molding. It exhibits low viscosity, good flow characteristics, and rapid cure kinetics—enabling efficient production of complex, high-precision parts with minimal post-cure requirements.
Q4: Does this material meet regulatory requirements for aerospace or medical use?
A: Dow SILASTIC LS 5-2040 is designed to support compliance with common aerospace specifications (e.g., AMS 3323, ASTM D471) and can be formulated to meet relevant industry requirements for extractables and outgassing. However, final regulatory acceptance depends on the complete part design, processing conditions, and end-use validation by the customer.
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