De Dietrich Silicone cord 7880648

De Dietrich silicone cord 'D10', 5 mm (5 m), SKU 7880648, is a sealing cord for boiler housing parts. It is made of heat-resistant silicone and measures 5 mm in diameter and 5 meters in length. This cord is used to seal joints between boiler housing panels, doors, and frames, preventing flue gas leakage and maintaining thermal insulation. It is designed for gas and oil-fired De Dietrich boilers.

Parts of this type are selected by diameter and material. The 5 mm cross-section must match the groove or gap depth of the original housing seal. When replacing, remove the old cord completely and clean the groove. Fit the new cord without stretching, and secure ends with high-temperature adhesive if needed. Ensure the length ordered provides enough cord to trace the full perimeter; excess can be trimmed.

When seals of this kind fail, they may crack, harden, or lose flexibility due to heat exposure, leading to flue gas leaks or poor door fit. Symptoms include visible gaps, soot around joints, or reduced boiler efficiency. Check the cord for wear, compression, or damage, and verify it is properly seated in the groove.