Mylar is a clear film made from stretched polyethylene terephthalate (PET). However, mylar bags are made from several layers of laminated plastic and a aluminum foil or a metalized coating. So, mylar pouches have a silver effect, many people automatically consider mylar to be metallic. Mylar is often refer to almost any foil lined, plastic, flexible barrier material. Mylar pouches provide protection from gas, moisture, light, and odor. Besides, with these ideal properties including chemical stability, high tensile strength, and  a high puncture resistance, mylar bags are used in a diverse lineup of products. For example: important papers documents, books, firearms, weapons, medical and pharmaceutical items, ammo, precious metal, etc. By the way, mylar bags are wide used in long term food storage, such as freeze-dried foods, wheat, white rice, beans, pasta, oats, sugar, and flour, etc. Food will not react with aluminum because it is separated by a food-grade plastic lining.
As a professional mylar bags manufacturer, we can produce different thicknesses and size mylar bags. The higher the mil rating, the thicker and stronger the Mylar bag is. Please feel free to contact us!