How thick should the fireproof sealant inside the cable tray be

The fireproof sealant inside a cable tray should generally be applied to a thickness of 20–30 mm, ensuring complete coverage without gaps.Recommended ThicknessFor cable trays passing through walls, floors, or slabs, firestopping materials should be applied with a thickness of 20–30 mm at slab penetrations, often combined with a fire-support plate at the top for added protection . When using firestop packs, the packing thickness should not be less than 24 cm, and gaps between the packs and cables should not exceed 1 cm² to maintain fire integrity .Material SelectionChoose fireproof materials that comply with national safety standards, such as:Fire-rated boardsFirestop packsFirestop masticFire-resistant mineral woolFireproof coatings or tapes like FLAMMOTECT-A or DG-CR 0.7 for additional protection These materials should provide both fire resistance and durability, and be suitable for indoor or outdoor use depending on the installation environment.Application GuidelinesApply the sealant evenly and smoothly using spraying, rolling, or brushing, avoiding drips or bubbles .Ensure complete coverage inside and around the tray, sealing all gaps and voids.For large openings, install a fire-resistant backing plate before applying the sealant .Maintain proper alignment and spacing of cables to facilitate installation and future maintenance .Inspection and MaintenanceUse a calibrated device to measure coating thickness and verify compliance with design specifications .Conduct adhesion tests (cross-cut or pull-off) to ensure the sealant bonds securely.Periodically inspect trays for wear, corrosion, or coating degradation, and reapply fireproof coatings as needed to maintain fire resistance . By following these guidelines, the fireproof sealant will provide effective protection against fire propagation while ensuring compliance with safety standards.