Engineering resins? Asaclean purging compounds can take the heat

"As more advanced materials are used by industry, the high temperatures make it more difficult to clean the equipment," says Galluci. "That's why we have developed two high-temperature-grade purging compounds: Asaclean PX2 and PF."

The PX2 grade is an improved version of our ground-breaking PX grade, says Galluci. A glass-filled grade offering a service temperature range of 280° to 420°C (535° to 790°F), the product is suited for purging engineering resins such as PEEK, PPS, PEI and LCP from thermoplastic injection molding machines and extruders. The compound was designed to minimize smoke and odor, which can be a common occurrence when purging high-temperature resins, according to the company.

The non-glass-filled PF grade also accommodates those service temperatures and is designed for purging engineering resins such as PPS and PEI. Appropriate for hot-runner cleaning, the PF grade can be used as a sealing material during machine shutdowns within certain temperature ranges because of its thermal stability.

At NPE2015, Sun Plastech also highlighted its polypropylene-grade purging compound, Asaclean HP. Specifically designed for large parts, the product has a high melt flow rate, making it suitable for high-cavitation hot-runner cleaning. The service temperature range is 340° to 570°F (170° to 300°C).