Packaging of pH verification solutions can include the following:
Single buffer:
Carton : PAP 20, PAPER COLLECTION
Solution sachets: C/PET 90, PLASTIC COLLECTION
Cardboard : PAP 21, PAPER COLLECTION
Label : PAP 22, PAPER COLLECTION
55 ml disposable bottles:
Bottle: PET 1, PLASTIC COLLECTION
Cap : PP 5, PLASTIC COLLECTION
Label : PAP 22, PAPER COLLECTION or PP 5, PLASTIC COLLECTION
check your municipality's regulations for disposal