Method and Price of Fireproof Putty Sealing Cable Trays

Fireproof sealing putty for cable trays typically costs between $20 and $50 per kilogram, depending on type, certification, and supplier.

Overview

Fireproof sealing putty, also known as intumescent putty or firestop sealant, is used to seal cable penetrations in walls, floors, and ceilings to prevent the spread of fire, smoke, and toxic gases . It is essential for maintaining fire-rated assemblies in electrical installations, including cable trays, conduits, and junction boxes . The putty expands under heat to form a protective barrier, providing up to 4 hours of fire resistance depending on depth and coverage .

Pricing

• 1 kg tubs of intumescent or fire-resistant putty are commonly available and cost approximately $20–$50 per kilogram .
• Bulk purchases or specialized formulations (e.g., high-temperature resistance, UL or EN certifications) may increase the price.
• Suppliers like Alibaba offer a range of fireproof putties with varying compositions, including Portland cement-based, asphalt-based, and gypsum-based types, which can affect cost .
• Retailers such as Stormflame provide 1 kg tubs tested to EN1366-3 and BS476: Part 20, suitable for metallic and plastic cables, with prices typically in the $25–$40 range per tub .

Considerations for Cable Tray Applications

• Ensure the putty is certified for electrical penetrations and compatible with the cable type (metallic or plastic) to avoid damage .
• Depth and coverage affect fire resistance; thicker applications provide longer protection.
• Some products are flexible and non-setting, allowing for movement and re-use, which is beneficial for cable trays that may require maintenance or retrofitting .
• Pairing putty with intumescent collars or sealbags can enhance fire protection in high-risk areas .

Recommendation

For cable tray installations, select a certified intumescent putty with at least EI 60–120 minutes fire rating, and consult suppliers for bulk pricing if large quantities are needed. Always verify compliance with local fire safety standards such as UL 1479, ASTM E814, or EN1366-3 .