Waterproof PU Metal Sandwich Panel
The core principle of waterproofing for sandwich panels Inherent characteristics of the material Some raw materials of the boards themselves have a certain degree of water resistance. For instance, plastic boards (such as PVC boards) have a dense molecular structure, making it difficult for...
The core principle of waterproofing for sandwich panels
Inherent characteristics of the material
Some raw materials of the boards themselves have a certain degree of water resistance. For instance, plastic boards (such as PVC boards) have a dense molecular structure, making it difficult for water to penetrate. And after wood undergoes special treatments (such as impregnation and coating with water repellents), its water absorption can also be reduced.
Waterproofing process enhancement
Our Waterproof PU metal sandwich panel forms a physical barrier to prevent moisture from entering through processes such as coating on the surface of the sheet (such as applying Waterproof coating, pasting waterproof film), edge sealing (using waterproof glue to seal the joints of the sheet), etc.
How can sandwich panels achieve waterproofing
Choose waterproof boards
One approach is to choose boards with natural waterproof properties, such as plastic boards, rubber boards, etc. These materials themselves have excellent waterproof functions and can resist the erosion of moisture. For example, our Waterproof PU metal sandwich panel can perfectly solve this problem.
Surface coating treatment
For other types of boards, such as wood boards and stone boards, their waterproof performance can be enhanced through surface coating treatment. Use waterproof coatings or waxy coatings, which can form a waterproof barrier to prevent water from penetrating.
Special treatment technology
Advanced processing technologies, such as nano-waterproofing technology, can be adopted. By forming a nano-level waterproof layer on the surface of the board, its waterproof capacity can be enhanced. In addition, some boards undergo special waterproofing agent treatment during the production process to enhance their water resistance.
Waterproof sealing treatment
For the joints of the boards, waterproof sealant can be used for sealing treatment. This sealant has excellent elasticity and water resistance, and can effectively prevent water from seeping through the joints.
The above methods can be used separately or in combination to achieve the best waterproofing effect. In practical applications, appropriate waterproofing measures should be selected based on specific circumstances.
Factors affecting the waterproofing effect of sandwich panels
Environmental factors
Environmental humidity, temperature, and whether there is water accumulation or not will all affect the waterproof effect of the board. For instance, even waterproof boards may have their waterproof performance affected to a certain extent if they are exposed to a high-humidity environment with accumulated water for a long time.
Installation process
Whether the installation process of the panels is standardized is crucial to the waterproofing effect. For instance, whether the joints between the boards are tightly sealed and whether the edges have been properly treated, etc., if installed improperly, it is easy for water to seep in through the gaps.
Usage time
As the usage time increases, the waterproof coating of the board may wear out, age and other conditions, thereby reducing its waterproof performance. Our Waterproof PU metal sandwich panel ensures the firmness of the Waterproof coating without damage through multiple processes.
The waterproof, moisture-proof and durability advantages of sandwich panels
Overall sealing and waterproof performance
The surface layer of our Waterproof PU metal sandwich panel is continuous metal sheet (such as aluminized zinc sheet, color steel sheet), and the sheet joint is sealed with special Waterproof sealant and lap groove, which can form an overall waterproof interface. Rainwater infiltration ≤0.1L/(㎡ · h) (conforming to GB/T 23450-2009 standard); Ordinary wall tiles rely on mortar for waterproofing through jointing. The jointing agent is prone to cracking and aging, and water seepage problems generally occur after 3 to 5 years. Regular jointing and maintenance are required. Moreover, wall tiles themselves have a strong water absorption capacity (with a water absorption rate of about 8% to 15%), and they are prone to moisture return and alkali efflorescence in a humid environment.
Corrosion resistance and extended service life
The surface layer of the sandwich panel can be coated with fluorocarbon or polyester (salt spray test ≥1000 hours), and the core material (such as polyurethane or rock wool) is resistant to acid and alkali corrosion. Its service life can reach 15 to 20 years in industrial environments and humid coastal environments. Ordinary wall bricks (especially clay bricks) have weak resistance to freeze-thaw cycles and carbonization. In northern regions, they tend to develop surface powdering and peeling within 5 to 8 years. In coastal areas, due to salt spray erosion, their lifespan is only 8 to 12 years, requiring frequent renovations.
Test methods for the waterproof performance of sandwich panels
Water absorption thickness swelling rate test
After soaking the sheet sample in distilled water at a certain temperature for a specified period of time, measure the ratio of the thickness change to the original thickness. The smaller the ratio, the better the waterproof performance of the sheet.
Water resistance test
Soak the board in water for a relatively long time (such as 24 hours, 72 hours, etc.) and observe whether there are any deformation, cracking, delamination or other phenomena. The board with no obvious changes has better waterproof performance.
Surface water resistance test
Pour a certain amount of water onto the surface of the board, let it stand for a period of time, and then observe whether the water penetrates into the interior of the board and whether there are any blisters or discoloration on the surface of the board.
The above three tests of Waterproof performance can confirm that our Waterproof PU metal sandwich panel has extremely high waterproof ability, which is superior to most boards on the market.
Installation and acceptance of sandwich paneL
Visual inspection
Check whether the surface of the waterproof PU sandwich panel is flat, clean, free of scratches, deformations and damages. The plates are neatly arranged, with uniform and tight seams.
Fixed inspection
Check whether the self-tapping screws are firmly fixed and whether the waterproof gaskets are intact without any loosening or falling off.
Sealing inspection
Check whether the waterproof sealant at the joints is full, continuous, free of cracks and bubbles, and touch the sealant layer with your hand to see if it is elastic.
Waterproof test
A spray test can be conducted on the surface of the installed panels to simulate a heavy rain environment. Spray continuously for more than 2 hours to check if there is any water seepage on the back of the panels and at the joints.
1
The surface of our Waterproof PU metal sandwich panel should be kept clean to avoid the accumulation of oil stains, dust, etc., so as not to affect the performance of the Waterproof coating. When cleaning, neutral detergent should be used and strongly corrosive detergents should be avoided.
2
Prevent sharp objects from scratching the waterproof coating on the surface of the board. Once the coating is damaged, it should be repaired in time.
3
If water accumulates on the surface of the board, it should be cleaned up in time to prevent the board from absorbing water due to long-term water accumulation.
FAQ
Q: How to judge the quality of waterproof boards?
A: It can be judged from the appearance that a good board has a smooth and uniform surface without any defects such as holes or lumps. Check the label. The trademark information of qualified products is complete and the handwriting is clear. Measure the thickness. Plates with uniform thickness are of better quality. It can also pass the water splashing test, and its waterproof performance is relatively good as water does not penetrate into the interior.
Q: How to seal and splice waterproof boards?
A: Waterproof glue can be used to fill the gaps at the board joints, and then sealing tape can be used for reinforcement. Waterproof coating can also be applied at the joints to form a sealing layer. For some waterproofing projects with higher requirements, special waterproof connectors can also be used for splicing to ensure the sealing effect.
Q: Can waterproof boards be soaked in water for a long time?
A: Although waterproof boards have certain waterproof performance, except for a few materials such as stainless steel plates, most waterproof boards are not recommended to be soaked in water for a long time. Otherwise, it may affect their performance, causing problems such as deformation and delamination, and shortening their service life.
Q: Can there be discounts for bulk purchases?
A: Sure. The larger the order quantity, the more discounts there will be. The specific amount can be negotiated based on the purchase volume (such as how many square meters or how many cabinets).
Q: How to clean and maintain waterproof boards?
A: On a daily basis, you can wipe the surface of the board with a damp cloth to remove dust and stains. If there are stubborn stains such as oil stains, you can wipe them with a neutral cleaner, then rinse with clean water and dry. Avoid using sharp objects to scratch the surface of the board and damage the waterproof coating.
Q: Can you provide samples?
A: Sure. Just tell us the type and specification you want, and we'll mail it as soon as possible for you to check the appearance and test the basic performance.
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