CSD Sealing Systems CSD Sealing Systems
FISSIC® waterproof and fire rated coating

FISSIC® waterproof and fire rated coating

Our re-enterable duct seal systems are engineered for environments where adaptability is essential. Designed to offer robust defence against water, gas, smoke, fire and rodent ingress, these seals allow easy access for upgrades, maintenance or service changes, without compromising safety or performance.

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FISSIC
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FISSIC® waterproof and fire rated coating

Engineered for critical infrastructure, the NOFIRNO®

Duct Seal system is the go-to solution for high-performance protection in underground and above-ground ducting. Whether it’s a fibre optic rollout, a utility substation, or a high-risk industrial environment, NOFIRNO®

delivers unmatched resistance to fire, water, gas, and rodent ingress – all in one flexible, low-maintenance system.
With over 100,000 kits installed across the UK, NOFIRNO®

is a trusted choice for clients who demand long-term reliability without compromise.

Key Benefits

  • Up to 4 hours fire resistance – independently tested and certified.
  • Watertight and gastight – pressure-tested up to 10 bar in small openings.
  • No frame required – flexible installation in any shape or size duct.
  • Future-proofed – easy re-entry for adding or replacing services.
  • Proven longevity – over 50 years of age-tested sealing integrity.

Designed For

  • Power and utility networks
  • Data centres
  • Transportation infrastructure
  • Civil and commercial construction
  • Renewable energy facilities

Useful Information

The installation advantage

Available as a complete kit with simplified instructions and access to our online installation video hub, the NOFIRNO®

Duct Seal helps your team get the job done faster and with full confidence. Or, let our CSD Technical Services team handle everything – from design to installation to inspection.

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“CSD’s team are very focused in their approach to provide a high-quality product and service. We are looking forward to working with them in the future.”

Senior Electrical Design Engineer

Thames Water