Can high temp purging material also be used for low temp materials?

No, you should use high-temp purge for high-temperature plastics and low-temp purge for low-temperature plastics.

Here are the temperature ranges for the purge compounds we offer:

Low-temp purge: 320º F – 625º F (160º C – 329º C)
High-temp Purge: 575º F – 715º F (302º C – 379º C)
Ultra High-Temp Purge: 280°C to 420°C (535°F to 790°F)