fiberglass or styrofoam works well. Also, you can use that spray on foam, it doesn't seem like it but it will work really well.
nonmetals
diapers are good insulators because they hold in the cold and and heat but is a bad conductor
No, shiny surfaces are not good insulators. Shiny surfaces are reflective and do not support the absorption and retention of heat, which is a characteristic of good insulators. Good insulators are materials with low thermal conductivity that trap heat effectively.
rubber
Sound insulators are similar to heat insulators in that they both aim to reduce the transfer of energy, but they work in different ways. Sound insulators absorb and dampen sound vibrations, while heat insulators reduce the transfer of heat through conduction, convection, or radiation. Materials that are good sound insulators may not necessarily be good heat insulators and vice versa.
Marbles are not good insulators because they are made of dense material and can conduct heat easily. Insulators are materials that do not allow heat to flow through them easily, whereas marbles are more likely to transfer heat.
No, insulators are not good conductors of heat. Insulators are materials that do not easily allow heat to pass through them due to their high resistance to thermal conductivity. They are used to prevent the transfer of heat, maintaining a barrier between hot and cold environments.
Three good insulators of heat are, maybe plastic, wood and glass! That's all I can think of right now but plastic and wood are very good insulators (etc. used of saucepan handles)
glass rubber
No. Both metals are good conductors of heat.
Insulators, such as wood aren't very good conductors of heat.
toilet paper