This question already has an answer here:
I very recently came across a mezuzah made from recycled material. The product is referred to as a Tikun Olam mezuzah case and they are apparently all made from reclaimed plastic from the ocean. (the idea is you're cleaning the oceans while performing the mitzvah which they claim as a form of Tikun Olam)
As much as I thought the idea was cool, it brought up a question I never really considered.
Is there a rabbinical standard for the type of housing/case you should use for a mezuzah? I've obviously seen mezuzah cases in a variety of materials.
That being said, would there be a concern of disrespecting the scroll if you place it inside of a mezuzah recycled from what is essentially trash?