Why buyers encounter it
Actual barrier depends on grade, thickness, humidity, adjacent layers, and test conditions. The letters alone do not supply an OTR value.
Use the term carefully
This definition helps interpret a packaging conversation. It does not establish a complete film structure, machine setting, regulatory conclusion, shelf-life result, or approval for a particular application.
Research source: PC-030, PC-035. Application-specific details remain subject to manufacturer and technical review.