In Biodegradable Materials (PBS) manufacturing, thermal control is essential to balance reaction efficiency, molecular-weight development, color stability, and final resin consistency. Polybutylene succinate production typically begins with esterification in the 160-190°C range, followed by high-vacuum polycondensation at about 220-240°C, with advanced systems pushing final reactor temperature toward 245-255°C for stronger polymer growth and tighter product specifications. Because these stages demand stable heat input, careful removal of by-products, and reliable long-run performance, heat-transfer fluid selection directly influences plant safety, throughput, and polymer quality. Within this operating window,Eurotherm 330provides excellent low-temperature fluidity, a -49 to 315°C range, 4.04 mm²/s viscosity at 40°C, and a -68°C pour point for cold starts and flexible transitions.Eurotherm 320offers a cost-effective -30 to 320°C range with strong thermal stability for mainstream esterification, reboiler, and purification duties.Eurotherm 350andEurotherm THTextend service to 350°C with low system pressure and exceptional thermal integrity for heavy-duty continuous polycondensation loops. For larger closed systems,RÜTGERS Ruetaflex 1000delivers -55 to 330°C coverage with low viscosity and long service life, whileRÜTGERS Ruetasolv BP-Dsupports demanding 24/7 operation with low-pour-point, low-viscosity, high-temperature durability for modern PBS plants seeking lower maintenance and dependable output.