Oxygen transmission rate

Oxygen transmission rate (OTR) measures how much oxygen passes through a material, like packaging or a film, over a specific area and time. It's expressed in units such as cc/m²/day, indicating the volume of oxygen that leaks through per square meter each day. A lower OTR means the material better prevents oxygen from entering, which is important for protecting sensitive products like food or pharmaceuticals from spoilage. Essentially, OTR helps determine how well a barrier material can keep oxygen out, ensuring freshness and safety.