Generally speaking, a material that does not let electrons travel through it, a material that has a very high resistance to electron flow (electric current), is called an insulator.
Plastic.
plastic
Petroleum
metal
Any 'opaque' material. e.g. wood, brick, etc.,
An impermeable material.
There are many materials that light can not travel through which are called opaque objects.
Insulators- do not let heat through
opaque.
They don't let neutrons or electrons through.
An opaque material.
Insulator
How much light a material absorbs or lets through depends mainly on what kind of material it is. Usually pure substances will not absorb light but rather lets light through or reflects light. Exceptions include carbon, uranium and others. The exact theory goes into detail in how electrons absorb that energy and move to a higher orbital but generally, a material will let light through if the electrons require excessive energy to jump to a higher orbital.
Plastic
Yes
Plastic.
Rubber.