Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 www.labthink.com Gas Permeability Testing Explained-Essential for Food Wrap & Packaging Shelf Life Food wrap materials, from everyday cling films to sophisticated multi-layer composites, play a critical role in preserving the freshness, safety, and shelf life of countless products. Their effectiveness hinges on one crucial property: their ability to act as a barrier against gases like oxygen, nitrogen, and carbon dioxide. To quantify this essential characteristic, Gas Permeability Testers are employed – specialized instruments designed to evaluate how efficiently a packaging material can block or transmit specific gases. The core function of these testers is to measure the rate at which gases permeate through a material. This quantifiable data provides the scientific foundation for optimizing packaging designs, accurately predicting product shelf life, and ensuring stringent quality control across various industries. The Science Behind the Seal: Testing Principles Two primary methodologies dominate the field of gas permeability testing, each suited for different applications and materials: 1. Differential Pressure Method: This method operates by creating a constant pressure difference across the material sample. The gas (e.g., oxygen, nitrogen, CO2) then naturally
Open the catalog to page 1Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 www.labthink.com permeates from the high-pressure side to the low-pressure side of the test chamber. High-precision sensors continuously monitor the pressure changes occurring on the low-pressure side. Through specific calculations, the instrument determines the gas transmission rate, commonly expressed in units like cubic centimeters per square meter per 24 hours per 0.1 MPa (cm³/(m²·24h·0.1MPa)). This method aligns with international standards such as ISO 2556 (for gas transmission rate of plastic film) and ASTM D1434 (for...
Open the catalog to page 2Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 www.labthink.com Beyond Preservation: Applications and Industry Value The meticulous control over gas permeability translates into significant value across several critical sectors: • Food Packaging Industry: For food wrap materials, controlling oxygen transmission is paramount. Quantifying the gas barrier performance allows manufacturers to select optimal packaging materials, directly leading to extended food shelf life, enhanced freshness, reduced spoilage, and decreased product returns. • Pharmaceutical Packaging Industry:...
Open the catalog to page 3Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 www.labthink.com Labthink C206H Oxygen Transmission Rate Test System Advanced Gas Permeability Testers are engineered for precision and efficiency: • Oxygen Transmission Rate (Equal Pressure Method): Typical test ranges can span from 0.02 to 200 cm³/(m²·24h), with some models achieving even lower detection limits down to 0.0001 cc/(m²·day), boasting repeatability of 0.02% or 1% (whichever is greater). • Gas Transmission Rate (Differential Pressure Method): Ranges commonly fall between 0.01 to 50,000 cm³/(m²·24h·0.1MPa), with...
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