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https://www.bfr.bund.de/cm/349/alternatives-to-plastic-straws-which-materials-are-suitable.pdf
In preparation for the EU Single-Use Plastic Directive taking effect July 3, 2021, German Federal Institute for Risk Assessment (BfR) releases short report on alternatives to plastic straws; suggests silicone, stainless steel or glass for frequent use; for single-use, durum wheat with cold drinks and paper or board are safe if no chemicals of concern added