Oxygen Transmission Rate (OTR) Testing Guide for Packaging Films
The oxygen transmission rate (OTR) measures how quickly oxygen molecules move through a solid material in a specific amount of time. Oxygen is no different from other polymers in that it is permeable to gasses and vapors to varying degrees. The rate at which oxygen molecules will pass through a package wall is known as OTR in the context of packaging. OTR is expressed as cc/bottle/day.
TRUSTED BY
- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Oxygen Transmission Rate (OTR) – Overview
Oxygen Transmission Rate (OTR) testing measures the rate at which oxygen gas permeates through a material under controlled temperature and humidity conditions. It is a critical parameter for evaluating barrier properties of packaging materials, especially for products sensitive to oxidation such as food, pharmaceuticals, and electronics.
The test quantifies oxygen permeability by monitoring the amount of oxygen passing through a sample over time. Accurate OTR measurement helps ensure product shelf life, maintain quality, and prevent degradation by limiting oxygen exposure during storage and transportation.
Scope, Applications, and Benefits
Scope
OTR testing focuses on determining the oxygen barrier performance of films, sheets, and packaging materials to ensure suitability for applications requiring controlled oxygen exposure.
It includes evaluation under standardized environmental conditions to simulate real-world storage scenarios, enabling accurate assessment of material permeability and performance consistency.
- Measurement of oxygen permeation through materials
- Evaluation of barrier properties under controlled temperature and humidity
- Testing of films, laminates, and coated materials
- Assessment of packaging suitability for oxygen-sensitive products
- Comparative analysis of different material structures
- Monitoring of permeability changes due to environmental conditions
- Evaluation of multilayer and coated barrier systems
- Verification of compliance with packaging standards
Applications
- Food packaging materials
- Pharmaceutical blister packs
- Flexible and rigid plastic films
- Barrier coatings and laminates
- Medical device packaging
- Electronics and moisture-sensitive products
Benefits
- Ensures extended product shelf life
- Prevents oxidation and product degradation
- Supports material selection for packaging design
- Enhances quality and safety of packaged goods
- Enables compliance with industry standards
- Reduces risk of spoilage and waste
Oxygen Transmission Rate (OTR) – Test Process
Sample Conditioning & Mounting
The sample is conditioned and securely mounted in the test cell to prevent leakage or edge effects.
1Controlled Gas Exposure Setup
One side of the sample is exposed to oxygen while the other side is purged with a carrier gas.
2Permeation Measurement & Detection
Oxygen passing through the sample is detected using sensitive sensors over a defined period.
3Data Analysis & OTR Calculation
Permeation rate is calculated and expressed as oxygen transmission rate under specified conditions.
4Oxygen Transmission Rate (OTR) – Technical Specification
| Parameter | Details |
|---|---|
| Test Method | Gas permeation measurement using differential pressure or coulometric sensor method |
| Measurement Type | Oxygen transmission through material |
| Sample Type | Films, sheets, laminates, and packaging materials |
| Units | cc/m²/day or cm³/m²/day |
| Temperature Range | Controlled (e.g., 23°C or application-specific) |
| Humidity Control | Controlled RH conditions depending on test requirement |
Instrumentation Used for Testing
- OTR analyzer
- Gas flow control system
- Oxygen sensor (coulometric/electrochemical)
- Environmental chamber
- Sample sealing and mounting fixture
- Data acquisition system
Results and Deliverables
- Oxygen transmission rate (OTR values)
- Permeability data under specified conditions
- Compliance with relevant standards
- Comparative material performance analysis
- Detailed analytical report
- Recommendations for material improvement
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Frequently Asked Questions
Lower OTR values indicate better oxygen barrier properties, reducing oxidation and extending shelf life. Materials with high OTR allow faster oxygen ingress, accelerating spoilage and degradation of oxygen-sensitive products.
Material composition, thickness, temperature, humidity, and structural defects all affect oxygen permeability. Multilayer structures and coatings can significantly reduce transmission rates.
OTR measures oxygen passing through a material over time and area, while permeability normalizes this value considering thickness, providing intrinsic material property independent of sample dimensions.
Multilayer films introduce sequential diffusion barriers, forcing oxygen to follow a tortuous path. This increases resistance to permeation, significantly lowering overall OTR compared to single-layer materials.
OTR increases exponentially with temperature due to enhanced molecular mobility. This relationship often follows Arrhenius kinetics, enabling prediction of barrier performance under varying thermal conditions.
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