PE cling film oxygen barrier performance detection program - Database & Sql Blog Articles

**Abstract:** Plastic wrap is a common plastic packaging material used to keep food fresh. It can be used in microwave ovens and stored in refrigerators, making it essential to have high oxygen permeability. This paper presents the use of Labthink VAC-V2 differential pressure gas permeation equipment to measure the oxygen barrier performance of PE cling film. The testing process, principle, and instrument parameters are thoroughly described. This method serves as a reference for companies looking to evaluate their packaging materials. **Keywords:** PE cling film, oxygen permeability, oxygen transmission rate, barrier properties, Differential pressure gas permeation instrument. --- **1. Overview of Plastic Wrap** Plastic wrap is a type of plastic packaging product commonly made from ethylene-based polymers. It is widely used for microwave heating, refrigeration, and packaging of fresh and cooked foods. Its applications span households, supermarkets, restaurants, and industrial food packaging. Depending on the materials and additives, there are three main types: - **PE (Polyethylene):** Safe for food contact, suitable for fruits, vegetables, and semi-finished products. Can be heated in microwaves up to 110°C. - **PVC (Polyvinyl Chloride):** Also used for food packaging but has potential health risks due to its chemical composition. - **PVDC (Polyvinylidene Chloride):** Often used for cooked meats and processed foods. Among these, PE and PVDC are considered safer, while PVC contains harmful substances like carcinogens. Therefore, consumers often prefer PE cling films for their safety and versatility. --- **2. Testing Standards** In China, the primary standards for measuring oxygen transmission rates in flexible packaging materials are GB/T 1038 (differential pressure method) and GB/T 19789 (coulomb method). This study follows the differential pressure method, which is well-suited for determining the gas permeability of thin films and sheets. --- **3. Sample Description** The sample tested was a polyethylene (PE) cling film produced by a local factory. It represents a typical product used in household and commercial food packaging. --- **4. Testing Equipment** The test was conducted using the **VAC-V2 differential pressure gas permeation instrument**, developed by Jinan Languang Electromechanical Technology Co., Ltd. This device is designed for precise measurement of gas permeability across various materials, including plastics, papers, and composites. **Figure 2: VAC-V2 Differential Pressure Gas Permeation Instrument** --- **4.1 Working Principle** The VAC-V2 works based on the differential pressure method. A pre-treated sample is placed between two chambers. The lower chamber is evacuated, and then the upper chamber is filled with a gas at a controlled pressure. This creates a pressure gradient across the sample, allowing gas to permeate through it. The system continuously monitors the pressure changes in the low-pressure chamber, enabling accurate calculation of oxygen transmission rates. --- **4.2 Application Scope** This equipment is suitable for testing gas permeability in a wide range of materials, such as: - **Film types:** Plastic films, paper-plastic composites, aluminized films, aluminum foils. - **Sheet types:** Engineering plastics, rubber, building materials, etc. - **Gases tested:** Oxygen, nitrogen, carbon dioxide, air, helium, and even flammable or explosive gases (with proper modifications). It complies with international standards like ISO 15105-1, ASTM D1434, and GB/T 1038. --- **4.3 Key Parameters** - **Test Range:** 0.05 ~ 50,000 cm³/m²·24h·0.1MPa - **Number of Samples:** 3 independent samples - **Temperature Range:** 5°C ~ 95°C (±0.1°C accuracy) - **Humidity Range:** 0%RH ~ 100%RH (±1% RH accuracy) - **Supports toxic and flammable gases (with modification)** - **Data fitting capability for extreme conditions** - **Lystem™ data management system** for report generation and result tracking --- **5. Test Procedure** 1. Cut 3 samples with a diameter of Φ97 mm. 2. Clamp each sample into separate test chambers. 3. Input sample details such as name, thickness, temperature, and humidity. 4. Start the vacuum pump. 5. Click “Start Test” to initiate the measurement. The instrument automatically calculates and displays results. --- **6. Test Results** The measured oxygen transmission rates were: - 49.3704 cm³/m²·24h·0.1MPa - 48.1021 cm³/m²·24h·0.1MPa - 48.2883 cm³/m²·24h·1MPa These values indicate that the PE cling film has moderate oxygen barrier properties, suitable for general food preservation. --- **7. Conclusion** The VAC-V2 differential pressure gas permeation instrument is an efficient and reliable tool for evaluating the oxygen barrier performance of plastic films. It offers high precision, ease of operation, and excellent repeatability. As a leading manufacturer of packaging testing equipment, Labthink provides advanced solutions for global customers seeking accurate and standardized testing methods.

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