Preferably, in the Philippines.
Strongly recommend you to not buy microbeads cause this model in poorly represent real microplastic.
Recommend you to read:
https://www.researchgate.net/publication/351473041_Questioning_the_Suitability_of_Available_Microplastics_Models_for_Risk_Assessment_-_A_Critical_Review
You can try to create microplastic with lab weathering protocol
For example:
https://pubs.acs.org/doi/10.1021/acs.est.1c02196
More than welcome to connect and have more details on the protocol too.
Andrey
Hi Ben,
You may make an inquiry at Alfa Chemistry, they offer you advices and kinds of good-quality materials.
https://materials.alfachemic.com/inquiry
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