Barrier layers, coatings, and other additives may be added to PLA bottles and containers to enhance the properties of PLA. Unlike closures or labels, these additions cannot be visually determined to be problematic or potentially problematic for recycling. Therefore, testing is particularly important. APR promotes innovation in the development of new barrier technologies that can be demonstrated by testing to be compatible with recycling.
See "Requires Test Results" section
Like many other additives, optical brighteners are not removed in the recycling process and can create an unacceptable fluorescence for next uses of the recycled polymer containing the brighteners. It is difficult to identify material with this negative effect until extremely late in the recycling process where a great deal of added cost has been imparted into a material of low value due to the additive.
Also see "Requires Test Results" Section
REQUIRES TEST RESULTS
Other barrier materials, additives or coatings
The APR recognizes that other types of additives may be required for the performance of a particular package but are not addressed in this document. Additives such as de-nesting, anti-static, anti-blocking, anti-fogging, anti-slip, UV barrier, stabilizer and heat receptor agents and lubricants should be tested to determine their compatibility with recycling. Of particular concern are additives which cause the polymer to discolor or haze after remelting since recycled material with poor haze or discoloration is greatly devalued and has limited markets. This is particularly troublesome since it is difficult to identify material with this effect until extremely late in the recycling process where a great deal of added cost has been imparted into the material.
Test protocol: TBD