The Invisible Shield: Why UL-723 & UL 94 Silicone Gaskets are the Future of Offshore Fire Safety

In the high-stakes environments of marine vessels and offshore oil rigs, “standard” is never enough. When a fire breaks out in a confined, pressurized environment, the HVAC ductwork—the very system designed to provide life-sustaining air—can become a high-speed highway for toxic smoke and lethal heat. This is where the engineering of the smoke damper seal transitions from a simple component to a life-saving barrier. The Gold Standard: UL 723 /UL 94 & UL 555S Compliance Recent independent testing has pushed the boundaries of what silicone can achieve. While many materials claim fire resistance, the new generation of Berzelius® Fire Retardant Silicone Rubber Profiles sets a new benchmark in two critical areas: • Zero Flame Spread: Under UL 723 (ASTM E84) independent testing, these gaskets exhibit a zero flame spread index . This means the gasket will not contribute fuel to a fire or allow flames to “travel” along the seal. • Negligible Smoke Development: With a smoke-developed index of less than 20, these seals ensure that visibility remains clear for evacuation and that the risk of toxic smoke inhalation is minimized—a factor that causes significantly more offshore fatalities than heat alone. Engineered for the “H-Class” Future The oil and gas industry is shifting its focus toward Extreme Environment Engineering. Standard fires are one thing; Hydrocarbon (H-Class) fires are another beast entirely. These fires reach peak temperatures much faster and burn with significantly more intensity. The future of offshore safety lies in gaskets that can withstand these H-Class conditions. By utilizing advanced fluorosilicone and high-consistency silicone bases, these seals are being developed to: 1. Maintain Structural Integrity: Staying flexible and resilient at temperatures where EPDM or Neoprene would have long since vaporized. 2. Resist Chemical Degradation: In an oil and gas setting, seals are constantly exposed to salt spray, drilling fluids, and UV radiation. These silicone profiles are designed to survive 20+ years of exposure without losing their “spring-back” (sealing) capability. Why Marine & Offshore Engineers are Switching The move toward UL-certified silicone seals isn’t just about passing an inspection; it’s about operational reliability. • Pre-Approved Certification: By using UL-listed profiles, manufacturers of fire and smoke dampers can streamline their own UL 555S certification process, eliminating the need for redundant material qualification tests. • Airtight Compression: In pressurized HVAC systems, the silicone’s ability to compress and fill microscopic gaps in the damper frame ensures that no gas or smoke bypasses the blades. • Self-Extinguishing Properties: Even if the heat source is extreme, the material is inherently self-extinguishing, preventing the seal from becoming a secondary ignition source. The Bottom Line As global regulations tighten and the complexity of offshore operations grows, the “weakest link” in a fire safety system is often the gap between the damper blade and the frame. By specifying gaskets with zero flame spread and <25 smoke developed UL 723 and UL 555S compliance, operators are investing in a future where fire is contained, smoke is managed, and lives are protected. Looking to upgrade your HVAC safety systems? Explore the full range of Berzelius® Fire Retardant Silicone Rubber Seals for specialized HVAC , Marine and Oil & Gas applications.