What are the temperature thresholds for heat-welding polypropylene sheets?

Heat-welding polypropylene (PP) sheets requires precise temperature control to achieve strong, durable bonds. The optimal temperature range for welding PP sheets typically falls between 300°F (149°C) and 350°F (177°C). This range ensures the material softens sufficiently for fusion without degrading.

For hot air/gas welding, maintain a nozzle temperature of 320°F to 350°F (160°C to 177°C) while applying consistent pressure. Extrusion welding, another common method, often operates at slightly higher temperatures, around 350°F to 400°F (177°C to 204°C), to ensure proper material flow.

Always preheat the sheets slightly below the melting point (approximately 280°F/138°C) to avoid stress cracks. Use a temperature gun or infrared thermometer to monitor heat distribution evenly. Proper temperature management prevents weak joints or material warping, ensuring professional-grade results.

For best practices, consult the manufacturer’s guidelines, as additives or thickness variations may adjust the ideal thresholds.