EVA is one of the more popular materials today, and as a type of adhesive film, it can be used in facilities such as laminated glass and glass houses, showing good physical properties. This article focuses on the properties and processing of EVA interlayer.
Definition of EVA
EVA is a thermosetting adhesive film used to be placed between laminated glass (EVA stands for EthyIene Vinyl Vinyl Acetate). The superiority of EVA interlayer in terms of adhesion, durability, and optical properties has led to its increasingly widespread use in current components and various optical products.
A, the advantages of EVA interlayer
1, EVA interlayer's high transparency, high adhesion can be applied to a variety of interfaces, including glass, metal and plastic such as PET.
2, Good durability can resist high temperature, moisture, UV, etc.
3, EVA interlayer is easy to store. Room temperature storage, EVA adhesion is not affected by humidity and water-absorbent film.
4, EVA interlayer compared to PVB has a stronger sound insulation effect, especially high frequency sound.
5, EVA interlayer low melting point, easy flow and other properties, can be applied to a variety of glass laminating process, such as embossed glass, tempered glass, bending glass, etc.
B, the characteristics and performance of EVA interlayer
EVA interlayer to do laminated glass, in full compliance with the national standard of laminated glass "GB9962-99", the following 0.38mm thick transparent film as an example, the performance indicators are as follows.
Tensile strength (MPa) ≥17
Visible light transmittance (%) ≥ 87
Elongation at break (%) ≥ 650
Fogging rate (%) ≤ 0.6
Adhesive strength (kg / cm ) ≥ 2
Water absorption (%) ≤0.15
Irradiation resistance Qualified
Heat resistance Qualified
Humidity resistance Qualified
Impact resistance Qualified
Impact performance of elastic bag Qualified
UV cut-off rate ≤98.5%
C, the processing method of EVA interlayer
Place the made glass in a vacuum bag, vacuum ≥ 700mmHg (0.092Mpa), the temperature is 100-110 ℃ (the actual temperature of the glass surface), insulation for 10 minutes, cooling to below 60 ℃, unloading the vacuum.
D, the storage time and conditions of EVA interlayer
Store them in the original package without taking them out, put them in a light-proof and ventilated place, and the temperature should not exceed 30℃ and the humidity should be less than 80%.
E. product specifications of EVA interlayer
Thickness: 0.25mm,0.38mm Width: 2.1m Six, the product color variety (transparent, opaque and color), available.
At present, EVA is more often used in the field of solar photovoltaic, as the encapsulation of photovoltaic modules film used.
The original is mainly the use of foreign products, with the current strengthening of independent research and development production capacity, domestic products are gradually revealed, such as the Chinese Academy of Sciences Institute of Chemistry belonging to the degree of new materials, Zhehua FIRST (Foster) and Hangzhou Socombo, etc..
With the development of EVA research, it will have a larger and larger range of adaptability, these possibilities are supported by its own excellent foundation. E-SHINE is committed to the research and production of excellent EVA interlayer, welcome to learn more about the purchase.
