What is the difference between Rmin, Rmax, and R1max?

The resistance of a HRPPTC device under specified conditions (eg: at 25°C), before connection into a circuit. Devices of a particular type will be delivered with a range of resistances; therefore, a minimum value (Rmin), and/or a maximum value (Rmax) are often given. The maximum resistance of a HRPPTC device at room temperature one hour after being tripped or after reflow soldering is R1max.