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.
Opaque.
Materials that allow light to pass through them are called transparent materials.
metal
The material you are referring to is called an insulator. Insulators have low thermal conductivity, which means they are not good at conducting heat and therefore do not let heat pass through easily. Examples of insulating materials include wood, rubber, and fiberglass.
Opaque materials do not let light pass through them; they block or absorb light instead. This is because the atoms and molecules in opaque materials are closely packed together, preventing light from passing through the material.
An impermeable material.
Metals are good conductors of electric charge because they have free electrons that can move easily through the material in response to an electric field. Examples of good conductors include copper, silver, and aluminum.
Insulators- do not let heat through
opaque.
They don't let neutrons or electrons through.
An opaque material.
Insulator
Plastic
Yes
Rubber.
The material is conductive. Metals (copper or aluminum, etc) allows charged particles of electrons to move freely in either direction along their length.
A material that doesn't let water pass through is called impermeable. Examples include rubber, plastic, and certain types of waterproof fabrics.