Foshan tempered glass manufacturers for construction, how to judge the quality of the interlayer in laminated glass?

The quality of the interlayer in laminated glass (also known as laminated glass) directly affects the safety, durability, and performance of the glass. Therefore, the quality of the interlayer is a crucial factor when choosing laminated glass. The interlayer is usually composed of a PVB film (polyvinyl butyral) or other types of film materials (such as EVA film, SentryGlas film, etc.).

1. Uniformity of the Interlayer

The uniformity of the interlayer is an important indicator for judging its quality. The interlayer should be evenly distributed, free of bubbles, and free of impurities. If the interlayer contains bubbles, wrinkles, or other non-uniform phenomena, it will affect the impact resistance and optical effects of the glass, reducing its safety and stability.

- Inspection Method: The uniformity of the interlayer can be observed through light transmission, or by using appropriate testing methods (such as high-light microscopy inspection, observation under ultraviolet light, etc.) to check for bubbles, defects, etc.

2. Thickness of the Interlayer

The thickness of the interlayer directly affects the impact resistance and sound insulation effect of the laminated glass. A thinner interlayer may not provide sufficient bonding strength, causing the glass to break easily. An excessively thick interlayer may affect transparency and visual effects.

- Standard Thickness: Common thicknesses for PVB interlayer films are 0.38mm, 0.76mm, 1.14mm, etc. The total thickness of the laminated glass, the interlayer thickness, and the glass Size, usage environment, and design requirements are closely related.

- Inspection Method: Use professional instruments to measure the thickness of the interlayer to ensure that it meets the design and standards.

3. Transparency of the Interlayer

The transparency of the interlayer directly affects the appearance of the laminated glass. If the interlayer is opaque or yellow, it will affect the visual effect of the glass and may cause the windows to discolor or reduce light transmission.

- Inspection Method: Observe the overall appearance of the laminated glass to check for yellowing, clouding, or opaque interlayers. If this is the case, the quality of the interlayer may have problems, possibly due to the use of inferior film or improper storage.

4. Bonding Strength of the Interlayer

The bonding strength between the interlayer and the glass of the laminated glass determines whether it can maintain its overall structure when broken. If the interlayer bonding is not strong enough, the glass may cause fragments to scatter when broken, thus losing its protective function.

- Inspection Method: Appropriate peeling tests can be used to detect the bonding strength between the interlayer and the glass. A high-quality interlayer should be able to form a strong bond with the glass surface, ensuring that the glass fragments remain firmly attached to the film when broken.

5. Weather Resistance and Aging Resistance of the Interlayer

When exposed to ultraviolet rays, temperature differences, moisture, and other environmental conditions for a long time, the interlayer may age, discolor, become brittle, or peel off. High-quality interlayers should have good weather resistance and maintain stable performance during long-term use.

- Inspection Method: Conduct aging tests on the interlayer, such as ultraviolet aging tests under UV lights, or thermal and humidity cycle tests, to observe whether the interlayer discolors, bubbles, or cracks.

6. UV Resistance of the Interlayer

The UV resistance of the interlayer is also very important, especially for laminated glass used outdoors. If the interlayer cannot effectively block ultraviolet rays, long-term ultraviolet irradiation will cause the interlayer to discolor and age, affecting the overall quality of the glass.

- Inspection Method: Check whether the interlayer has UV-resistant properties. High-quality PVB films usually add UV-resistant materials to prevent the effects of ultraviolet radiation.

7. Environmental Protection of the Interlayer

High-quality interlayers must not only have excellent physical properties but also meet environmental protection requirements. Some low-quality films may contain harmful substances such as benzene and toluene solvents, which can affect the environment and potentially harm health.

- Inspection Method: Determine its environmental protection by verifying whether the film manufacturer meets relevant environmental protection standards (such as ROHS, REACH certifications).

8. Shock Resistance and Sound Insulation Effect of the Interlayer

The interlayer of laminated glass should also have good shock resistance and sound insulation effects, especially in some specific applications, such as high-rise buildings and automotive glass. The interlayer can absorb some of the impact force and reduce external noise.

- Inspection Method: Acoustic tests can be used to check the sound insulation effect of the interlayer, or vibration tests can be used to evaluate the shock resistance of the interlayer.

9. Production Process of the Interlayer

The production process also has a great impact on the quality of the interlayer. High-quality interlayers usually use more advanced production processes, such as vacuum lamination technology, which can effectively avoid bubbles and impurities in the interlayer and improve the bonding and transparency of the interlayer.

- Inspection Method: Ask the manufacturer about the type of film and production process used to understand whether it meets industry standards and quality requirements.