StockCap uses a variety of materials in the production of plugs,caps and all our products. Some items are not compatible with these materials. The responsibility lies with the purchaser to determine their product's compatibility with our materials. Our vinyl products do not meet the Food and Drug Administration requirement of 21CFR2177 for contact with food. Most of the materials used in the manufacturing of StockCap products can be recycled, however, it is necessary to check with your local recycling center for a list of accepted materials.