The quality test of EVA bags is a comprehensive evaluation process involving multiple aspects, including physical properties, chemical properties, environmental protection standards and other dimensions. The following are some key test items and methods:
1. Physical performance test
Physical performance test mainly evaluates the basic physical properties of EVA bags, including:
Hardness test: The hardness of EVA bags is usually tested by Shore A hardness test, and the common hardness range is between 30-70
Tensile strength and elongation at break: The tensile strength and elongation at break of the material are measured by tensile test to reflect the mechanical properties and stability of the EVA bag
Compression permanent deformation test: Determine the compression permanent deformation of the material under a certain pressure to evaluate the durability of the EVA bag
2. Thermal performance test
The thermal performance test focuses on the performance of EVA bags under high temperature conditions:
Melting point and thermal stability: The melting point and thermal stability of EVA materials are evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA)
Heat aging resistance: Test the aging resistance of EVA bags in high temperature environments to ensure that the product can still maintain good performance after long-term use
3. Chemical performance test
Chemical performance test evaluates the resistance of EVA bag to chemical substances:
Chemical corrosion resistance: evaluates the resistance of EVA bag to acid, alkali, salt and other chemical substances
Oil resistance: tests the stability and corrosion resistance of EVA bag in oil medium
4. Environmental adaptability test
The environmental adaptability test examines the adaptability of EVA bag to environmental factors:
Weather resistance test: detects the resistance of EVA bag to ultraviolet rays, humidity and temperature changes
Low temperature resistance test: evaluates the performance of EVA bag in low temperature environment
5. Environmental standard test
Environmental standard test ensures that EVA bag meets environmental requirements and does not contain harmful substances:
RoHS Directive: Directive restricting the use of certain hazardous substances in electrical and electronic equipment. The application of EVA materials in electronic equipment needs to comply with this directive
REACH Regulation: EU regulations on the registration, evaluation, authorization and restriction of chemicals. The production and use of EVA materials need to comply with the requirements of REACH Regulation
6. Transmittance and peel strength test
Special tests for EVA film:
Transmittance test: evaluates the light transmittance of EVA film, which is particularly important for applications such as solar panels
Peel strength test: tests the peel strength between EVA film and glass and backplane materials to ensure the reliability of packaging
Through the above test items, the quality of EVA packages can be fully evaluated to ensure that they meet the needs of various application scenarios. When producing and using EVA materials, companies need to strictly abide by relevant international, national and industry standards to ensure product quality and safety
Post time: Nov-29-2024