Positive temperature coefficient (PTC) materials based on amorphous poly(methyl methacrylate) with ultrahigh PTC intensity, tunable switching temperature and good reproducibility - ScienceDirect
AMWEI Thermistor Sensor - Professional Manufacturer of PTC NTC Thermistors Heater Temperature Sensor
What is the difference between an NTC and a PTC thermistor?
The different between NTC Thermistor and PTC Thermistor - Knowledge