Public transportation is becoming more popular as we seek to limit our CO2 footprint. According to estimates derived from the Department of Energy, train travel is approximately 34% more energy efficient than taking a flight and about 46% more energy efficient than driving.
Today, within the US alone, the goal appears to be doubling the number of rail trips and expanding rail routes in most major cities. Worldwide, there are absolutely no signs of rail transportation slowing down. Global governments are investing heavily in rail infrastructure and digitalization projects.
Revitalizing next-generation rail equipment will not come without challenges. In addition to improving the travel experience for passengers, rail manufacturers will need to ensure they can meet the enhanced safety standards by investing in innovative solutions that prioritize the safety, viability and reliability of worldwide rail transportation networks.
To discover the ways that silicone foam products are emerging as, small, yet crucial materials for safeguarding modern-day rail travel, we’ve talked with Diana Buckley, Sr. Product Manager, Silicone & CHR® Tapes.
Q&A: Enhancing Next-Generation Rail Travel with Silicone Solutions
Diana, can you explain how Norseal® products contribute to enhanced fire protection and safety in rail applications?
In the rail industry, risks such as electrical malfunctions, friction between moving components, and external factors like debris, heat, and flames can pose significant fire hazards with potentially catastrophic consequences.
By incorporating silicone gasketing materials in critical areas like engine compartments or passenger cabins, fires can be effectively contained, and the risk of spread minimized. These solutions must meet stringent standards and exhibit high flame retardancy to address the unique challenges of rail environments.
Saint-Gobain® Norseal Silicone products—such as F-12, F-15, and F-20—offer excellent fire protection due to their low outgassing properties and high flame retardancy. If exposed to fire, these materials are less likely to produce toxic, dark smoke or spread flames. They also demonstrate exceptional thermal resistance, functioning reliably across a wide temperature range (-51°C / -60°F to 204°C / 440°F), and feature outstanding compression set values for long-lasting performance.
While their cell structures and densities differ slightly, all three products are ideal for both interior and exterior sealing. Norseal F-12 and F-20 meet the HL3 classification under EN 45545-2, the highest standard for hazard levels, ensuring passenger safety.
For applications requiring fire-blocking performance, the Norseal FS1000 Series provides a polyurethane foam tape that expands into a fire-resistant char when exposed to temperatures above 200°C / 392°F. This char effectively seals gaps to block fire, smoke, and gases. Designed to be airtight, thermally insulating, and watertight, FS1000 is suitable for protecting seats, freight compartments, fuel tanks, HVAC systems, and more across rail and other industries.
Could you elaborate on the differences in cell structure and density among these products?
- Norseal F-15: A medium-low density silicone designed for environmentally stable, flame-retardant performance in gasketing, insulation, and dampening applications. It offers nontoxic properties, low smoke generation, and reduced flame spread. As the newest addition to the product family, F-15 is an excellent choice where lightweight materials and smoke resistance are required.
- Norseal F-12: Featuring a modified cell structure and low density, F-12 is ideal for gasketing and thermal insulation. Its lightweight nature improves fuel efficiency, making it suitable not only for rail but also for aerospace and aviation applications.
- Norseal F-20: With a finer closed-cell structure and medium density, F-20 excels in sealing applications. Its closed-cell design ensures high water resistance, providing reliable protection for electronic components and exterior lighting systems on rail cars.
What does it mean when these products have a low compression set?
A low compression set indicates minimal permanent deformation under pressure. This ensures long-lasting seals, reducing maintenance costs and extending product lifespans.
In addition to fire safety, how do these products enhance comfort in rail applications?
Norseal Silicone products also play a crucial role in improving passenger comfort. Their acoustic insulation and noise-dampening properties help minimize cabin noise and vibrations, reducing rattling and enhancing the overall travel experience.
Products like Norseal Silicone Sponge R10400 and R10460 are particularly effective for thermal and acoustic insulation, as well as HVAC sealing. With HL2 classification under EN 45545-2, they deliver excellent weather resistance and non-stick properties, making them ideal for rail applications requiring durability and performance in extreme conditions.
Enhance Safety with Advanced Silicone Solutions
As rail transportation evolves and expands, incorporating advanced silicone foam solutions marks a pivotal advancement in improving safety standards and passenger comfort. By utilizing cutting-edge materials and technologies, rail manufacturers can meet stringent safety regulations while delivering an enhanced travel experience.