On Reddit, u/SnapeSev reports the discovery of mysterious plastic disks that washed up on the Italian shore near Rogivo. They're flexible but hard and have the distinctive hyperbolic paraboloid ...

This interferes with the adhesive’s ability to wet out the substrate effectively, a crucial step for establishing adhesion.

replacing conventional substrates based on plastic materials. Plastic substrates are lightweight and cost-effective, but have low heat resistance and are prone to warpage. To address these issues ...