Dow SILASTIC LS-70 Fluorosilicone Rubber

Features Of Dow SILASTIC LS-70 Fluorosilicone Rubber

1. Excellent resistance to fuels, lubricants, and aggressive hydrocarbon-based fluids across wide temperature ranges.

2. Outstanding low-temperature flexibility down to –60 °C with retained elastomeric properties.

3. Superior thermal stability up to 200 °C for continuous service and short-term exposure to 230 °C.

4. Good compression set resistance, ensuring long-term sealing performance under dynamic and static conditions.

5. Compatible with standard silicone processing equipment and vulcanization methods (e.g., peroxide-cured).

Typical Applications Of Dow SILASTIC LS-70 Fluorosilicone Rubber

1. Aerospace fuel system seals and gaskets exposed to jet fuels and synthetic lubricants.

2. Automotive turbocharger hose couplings and sensor O-rings in high-temperature engine compartments.

3. Oil & gas downhole tool components requiring chemical resistance in sour gas environments.

4. Military-grade hydraulic system seals subjected to MIL-PRF-25988 and MIL-DTL-46167 specifications.

5. High-reliability semiconductor manufacturing equipment seals exposed to fluorinated solvents and plasma etch gases.

Specifications Of Dow SILASTIC LS-70 Fluorosilicone Rubber

Dow SILASTIC LS-70 Fluorosilicone Rubber – Frequently Asked Questions (FAQ)

Q1: What are the key advantages of Dow SILASTIC LS-70 compared to standard silicone rubbers?

A: Dow SILASTIC LS-70 combines the thermal stability and flexibility of silicone elastomers with enhanced resistance to fuels, oils, and polar solvents—thanks to its fluorosilicone chemistry. It maintains reliable performance across a wide temperature range while offering improved chemical compatibility over conventional silicones in demanding aerospace, automotive, and industrial sealing applications.

Q2: Is Dow SILASTIC LS-70 suitable for high-vacuum or ultra-clean environments?

A: Yes—LS-70 exhibits low outgassing characteristics and minimal volatile extractables when properly cured, making it well-suited for vacuum-compatible seals and components in semiconductor tooling, space hardware, and analytical instrumentation where contamination control is critical.

Q3: How does LS-70 perform at low temperatures, especially below −55 °C?

A: LS-70 retains excellent low-temperature flexibility and seal integrity significantly lower than many fluoroelastomers, with operational capability typically extending to −65 °C. Its glass transition temperature is optimized to balance cold-flexibility with high-temperature resilience, supporting use in extreme environmental cycling.

Q4: Can LS-70 be bonded to metals or other substrates without primers?

A: While LS-70 can achieve good adhesion to many substrates using appropriate surface preparation and curing protocols, optimal bond strength—especially to stainless steel, aluminum, or plated surfaces—is generally achieved with compatible Dow adhesion promoters or primers designed for fluorosilicones. Adhesion performance depends on part geometry, cure conditions, and service environment.