Does not conduct heat and blocks electricity.
|Acid dissolve rate
Insulator neither absorbs nor releases heat to other elements, meaning it can be used to protect things that are sensitive to heat. A single pixel's width is enough to be effective. Insulation IS flammable however, so be wary.
Insulator can be used to stop a Spark transfer from wires and electrons less than 2 pixels away, meaning you can have a wire with a 1 pixel space between it and a spark will not transfer if there is insulator in the gap. However, , , and all conduct across 3 pixel gaps regardless of whether there is INSL to block the current, so at least 4 pixels of INSL are required to stop current flowing into them.