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Does the LM7915CT have an insulated backing?

This LM7915CT 15 volt regulator IC, which I have not yet ordered, comes in a TO-220 case. I need to know if the back of the case is metallic or epoxy. The reason it's important is that this part will be mounted to the chassis ground and if it's metallic and if it's consistent with every other TO-220 case I've come to know, then the center pin (pin 2) will be electrically  connected to the metal case. That is not acceptable because pin 2 is the voltage input. The datasheet does not indicate whether or not it's insulated. Thank you for your help.