I wondered the same and unfortunately the manufacturers don’t publish the material of the tea bags. I am switching to loose tea and even when I only have tea bags i can take the tea out and brew it in reusable metal thing.

Nicer teas (pricier usually) come in cotton muslins - https://www.mariagefreres.com/en/tea.html?conditionnement=47. Their Marco Polo tea is my once a year splurge. The bag is tied with string - no glue.

Here's a pretty complete list of UK brands: https://moralfibres.co.uk/the-teabags-without-plastic/

The article made me check Yorkshire Tea and I'm not really quite sure. How bad are "plant-based plastics"?

> made from natural fibres like wood pulp and the seal is made with PLA - an industrially compostable, plant-based plastic

> ... so we're following WRAP's advice and avoiding the phrase "plastic free"

https://www.yorkshiretea.co.uk/our-packaging

https://www.yorkshiretea.co.uk/brew-news/plastic-in-tea-bags...

I believe PLA decomposes, unlike petroleum based plastics. I don't have a link for you though.

Should be a law to put the materials used on all products, not just foods.