In general, yes, silicone is thought of as an insulator. It can be engineered to conduct to a degree, but is generally not a conductor of electric current. It (silicone) is often used as an insulating medium.
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A vacuum is a great sound insulator. Materials that absorb energy such as wool are good insulators as well. I heard of a silicone adhesive that transformed acoustic energies into heat - that was a good insulator if it was used to glue two sheets of something together.
A good insulator is good at stopping heat escaping, whereas a bad insulator is not very good at trapping heat and lets it out.
Yes, air is a good insulator.Yes, air is a good insulator of both heat and electricity
insulator
wool holds lot of air.air being bad conductor of heat make the wool a good conductor of heat.