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Mylar is a polyester film.
Like polyacetate film, it is often used in safety blankets.
These films are coated with metal, one side solver, other side gold, or also silver.
The shielding is nice.
It shields in two ways.
1. the metal coating shields against transversal waves2. The plastic film in between sdoes refelct the biological active longitudinal waves.
It is one of the cheapest shielding materials.
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