The S1‑4000‑4241 Hydro Cement Sealant (S1‑BOSS 12503) is a high‑temperature refractory cement designed for sealing furnace components exposed to extreme heat. Commonly used in York, Coleman, Luxaire, Fraser‑Johnston, and other HVAC heating systems, this furnace cement creates a durable seal around combustion chambers, observation ports, burner boxes, flue connections, and refractory components.

Formulated to withstand repeated heating and cooling cycles, Hydro Cement helps prevent air leakage, maintain proper combustion efficiency, and restore damaged or deteriorated seals. It is ideal for furnace service, combustion chamber repairs, and sealing high‑temperature metal and refractory surfaces.

Cross‑Reference (Technician Binder Card Format)

Direct OEM

• S1‑4000‑4241
• S1‑BOSS 12503
• Hydro Cement Sealant

Compatible Brands

• Coleman
• York
• Luxaire
• Fraser‑Johnston
• Evcon
• Source 1 Equipment

Applications

• Combustion chamber sealing
• Observation port repairs
• Burner compartment sealing
• Flue connection sealing
• Refractory repairs
• Heat exchanger access covers
• Furnace restoration work

Related Products

• Observation burner cap gaskets
• Combustion chamber repair kits
• Refractory insulation materials
• High‑temperature furnace cements
• Burner door gaskets

Technician Notes

• High‑temperature furnace cement.
• Designed for combustion‑area repairs and sealing.
• Use on clean, dry surfaces for maximum adhesion.
• Allow proper curing before returning equipment to operation.
• Ideal for sealing cracks, gaps, and refractory joints.

Common Uses

• Repairing deteriorated combustion chamber seals
• Reinstalling burner observation windows
• Sealing vent and inducer connections
• Furnace rebuild and restoration projects
• Refractory patching applications

Benefits

• High heat resistance
• Durable long‑term sealing
• Helps maintain proper combustion airflow
• Reduces unwanted air infiltration
• Suitable for repeated thermal cycling