Much of the paper produced in the paper industry is recyclable, but wallpaper is not one of them.
Most wallpaper contains heavy amounts of dyes, inks and even fire retardants. Many types of wallpaper are also coated with a film-like layer of plastic to make them more durable and easier to scrub and keep clean.
The outside of padded envelopes, or padded mailers, “can be made of heavy paper, paperboard or corrugated fiberboard.”
These are recyclable materials if they were recycled as a stand-alone item. It’s when they are fused with padding material that their ability to be recycled becomes more difficult to discern.
If certain plastics aren’t recyclable, why do they have a triangle on the bottom with a number in it? A commonly asked question, for sure.
Let’s first start with the organization that brought us the solid triangle containing a number to begin with.
“ASTM International, founded as the American Society for Testing and Materials, is a nonprofit organization that develops and publishes approximately 12,000 technical standards, covering the procedures for testing and classification of materials of every sort.” This obviously includes plastics, or resin.
Much of the paper produced in the paper industry is recyclable, but wallpaper is not one of them. 
