Fiberfrax® Pumpable XJ1 is a versatile, pumpable insulating putty formulated to seal voids, repair cracks, and insulate hard-to-access thermal areas. It can be applied while equipment is online, making it ideal for maintenance during operation. Once air-dried, it forms a strong, low-density insulation barrier that provides excellent thermal and acoustic protection.
This high-temperature refractory putty is engineered for long-term use in boilers, kilns, furnaces, and refractory back-up systems where thermal shock, corrosion resistance, and insulation performance are essential.
Key Benefits:
High Temperature Capability: Rated up to 1260°C (or 1400°C for high-temp grade)
Low Thermal Conductivity: Improves energy efficiency and equipment safety
Lightweight & Durable: Sets into a tough, low-mass structure with sound absorption benefits
Resists Thermal Shock: Suitable for cyclic and high-heat environments
Quick Application: Pump, trowel, or apply by hand with minimal equipment
Continuous Use Temp: 1260°C (1400°C for high-temp version)
Melting Point: 1760°C
Density: 1200 kg/m³ (wet), 400 kg/m³ (dry)
Shrinkage: 6% standard; 4% in high-temp version
Packaging: 20 kg pails
Installation & Drying:
Apply via pumping, trowelling, or hand application. Air-dries naturally, with accelerated drying upon furnace heat-up. Ensure moderate ventilation during curing.
For fast, reliable repairs and insulation protection in high-temperature operations, choose Fiberfrax XJ1 Pumpable Insulating Putty—trusted across power generation, metal processing, and thermal maintenance industries.
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