HEAT-RESISTANT CONVEYOR BELT

A heat-resistant conveyor belt is a specialty belt whose cover compound is formulated to survive contact with hot bulk material — sinter from steel mills (≤180 °C), hot clinker leaving a cement kiln (≤200 °C peak), foundry sand, coke or hot fly ash. Standard NR/SBR covers harden, crack and debond above about 80 °C continuous; the heat-resistant grades use EPDM, butyl or specialty SBR blends with high-temperature resins and crosslinkers that retain elasticity and adhesion at elevated service temperatures.

Industry practice divides heat-resistant belts into four grades based on continuous and peak operating temperature. T1 covers material up to roughly 100 °C continuous (125 °C short-term peaks); T2 to 125 °C (150 °C peak); T3 to 150 °C (175 °C peak); T4 to 175 °C continuous with peaks up to 250 °C for brief loading events. The carcass is typically EP fabric for short conveyors and steel cord for long-haul hot-material installations; carcass insulation between cords/plies is also upgraded so the carcass core remains below its own thermal limit (about 120 °C for nylon/EP). Selection of the right [cover compound](/glossary/cover-compound) grade is governed by lump size, drop height, layer depth and contact dwell time — large hot lumps drop heat into the cover faster than small cool fines.

Common applications include sinter discharge belts, clinker conveyors at the cooler outlet, hot coke quenching lines, calcine discharge, and asphalt plants. The same belts are used for chemical processes (urea pellets, ammonium nitrate) where ambient is hot rather than the cargo itself.