How to identify the material of the waterproof junction box? If you burn it, it will damage the box. Then we choose simple identification. PC has the best gloss, ABS is the second, and PP is slightly worse. Looking at the weight and texture, PC of the same specification is the heaviest, ABS is the second, and PP is the lightest.
So how does the waterproof junction box achieve the waterproof effect? Here‘s how it works. First of all, this kind of junction box must have a waterproof effect, and its material should have a waterproof effect. At present, the most common large materials with a better waterproof effect are plastic, rubber, metal and other materials. For the junction box, metal is obviously unrealistic, mainly because the metal is a conductor, and using it as a material for the junction box can easily lead to leakage accidents. The rubber is easy to age and difficult to form, so there is only one functional requirement of the plastic junction box. In addition to the choice of materials, another point is its design structure. The structure is the key factor restricting its waterproof effect. A reasonable structure design can effectively avoid rainwater caused by various wind directions. There is also a high-efficiency waterproof setting using a silicone sealing ring, and the waterproof performance can be improved by 5 times.
The design of the waterproof junction box mainly considers the following situations:
1. Selection of materials: The main application areas of waterproof junction box products are the worksites and open-air sites with relatively harsh environments. When considering the safety performance of the product, the impact resistance, static load strength, insulation performance, non-toxicity, anti-aging performance, corrosion resistance and flame retardant performance of the material should be considered. (Non-toxic performance has received extensive attention, mainly because if the waterproof junction box product encounters a fire, it will not release toxic and harmful gases when it burns. Generally, it is often caused by inhalation of a large amount of toxic gases when a fire occurs. most.
2. Structural design: The overall strength, aesthetics, easy processing, easy installation and recyclability of the waterproof junction box should be considered. The waterproof junction box products produced by international mainstream manufacturers do not contain any metal accessories, which can simplify the product recycling process. However, most domestic manufacturers choose different materials, and the materials have poor anti-waxy performance. Generally, brass inserts are installed in the installation sockets in the waterproof junction box to increase the installation strength, which will increase the efficiency of the material recycling process. time and cost. Such problems can be solved if raw materials with high performance indicators provided by regular manufacturers are used.
3. Wall thickness: Generally, when designing the product, considering the overall cost of the product, the wall thickness of the product should be reduced as much as possible while meeting the impact resistance and anti-waxy change performance of the product. In the design of international waterproof junction boxes, ABS and PC The wall thickness of material products is generally between 2.5 and 3.5, the glass fiber reinforced polyester is generally between 5 and 6.5, and the wall thickness of die-cast aluminum products is generally between 2.5 and 6. The wall thickness of the material should meet the installation requirements of most components and accessories in the design.
4. Selection of sealing rubber ring material: For waterproof junction box products, commonly used sealing rubber ring materials are: PUR, EPDM, Neoprene, Silicon. Temperature range, tensile strength, expansion ratio, hardness, density, compressibility, and chemical resistance should be considered when selecting a gasket.
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