How to correctly select and use electrical plastic boxes with good insulation performance?

Selection and Use Guide for Electrical Plastic Boxes

 

1. Comparison of PC and ABS material characteristics and applicable scenarios

2. Key factors for selection

3. Precautions for use and maintenance

 

 

 

1. Comparison of PC and ABS material characteristics and applicable scenarios

1. Electrical insulation performance
PC material
In-depth principle: The reason why PC (polycarbonate) material has excellent electrical insulation is that there are no freely movable ions or electrons in its molecular structure. Its molecular chains are arranged regularly and tightly, making it difficult for charges to be conducted in it. In high-voltage and high-frequency electrical environments, the dielectric loss of PC material is very low, which can effectively prevent the leakage of current and maintain stable electrical performance. For example, in the insulating parts of some high-voltage power equipment, PC material can maintain a good insulation state for a long time under high voltage to avoid electrical breakdown.
Application case: In the charging pile equipment of new energy vehicles, due to the high-voltage charging process, the electrical insulation performance requirements are extremely high. PC material is widely used in the manufacture of charging pile shells due to its excellent electrical insulation and high temperature resistance. It can not only effectively isolate high voltage electricity and ensure the safety of users, but also work stably at different ambient temperatures (-40℃~120℃) and adapt to various climatic conditions.
ABS material
Performance characteristics: ABS (acrylonitrile-butadiene-styrene copolymer) material has good electrical insulation performance and can meet the insulation requirements of conventional low-voltage electrical appliances. There are relatively few polar groups in its molecular structure, which can prevent the conduction of current under low-voltage environment. However, due to its poor heat resistance (long-term use temperature ≤80℃), when the temperature rises, the movement of the molecular chain intensifies, which may lead to a decrease in electrical insulation performance. Therefore, ABS material is generally not suitable for electrical equipment in high-temperature environment.
Application scenario: ABS material has been widely used in the manufacture of shells of small household appliances such as table lamps and electric fans. These appliances usually work in low-voltage environments and have relatively low requirements for insulation performance. The good electrical insulation performance and low cost of ABS material make it an ideal choice. At the same time, its easy processing and molding characteristics also make it easy for manufacturers to produce various beautiful appearance designs.
2. Mechanical strength and durability
PC material
Strength advantage: PC material has excellent compression and impact resistance. Reaching the IK08 grade means that it can withstand a certain amount of energy without breaking. This is due to the good combination of toughness and rigidity of its polymer chain. In high-intensity environments such as outdoor and industrial environments, PC material can withstand various external forces, such as wind, sun, rain, and mechanical collision. For example, in the manufacture of protective covers for industrial automation equipment, PC materials can effectively protect the precision mechanical parts and electrical components inside, preventing them from being impacted and damaged by the outside world.
Durability analysis: In addition to impact resistance, PC materials also have good weather resistance. It can maintain stable performance under long-term ultraviolet radiation and is not prone to aging, discoloration, and embrittlement. This gives PC materials a long service life in outdoor applications and reduces the maintenance and replacement costs of equipment.

ABS material
Performance: ABS materials have good toughness and wear resistance, which gives them certain advantages in indoor or light-load scenarios. For example, in the manufacture of electronic products such as computer cases and keyboard shells, ABS materials can withstand a certain degree of friction and collision, and their good toughness can prevent the shell from breaking when subjected to slight external forces. However, the surface hardness of ABS materials is relatively low and it is easy to be scratched, which may be a disadvantage in some applications with high requirements for appearance.
Application limitations: Due to its relatively low mechanical strength, ABS materials are not suitable for occasions that withstand high-intensity external forces. In outdoor environments, ABS materials may age and degrade in performance under long-term exposure to ultraviolet rays, rain and other factors. Therefore, they are generally not used for equipment housings that are used outdoors for a long time.

3. Cost and processability
PC material
Cost analysis: The raw material cost of PC material is relatively high, which is mainly due to its relatively complex production process and relatively expensive raw materials. However, PC material has the characteristics of lightweight design, which reduces the amount of material used in the product manufacturing process, thereby reducing costs to a certain extent. In addition, lightweight products are also conducive to reducing logistics costs because the transportation weight is reduced. For example, in the manufacture of housings for some high-end electronic products, although the raw material cost of PC material is relatively high, the lightweight design not only improves the beauty and portability of the product, but also reduces the overall cost.

Processing characteristics: The processing of PC material requires certain technology and equipment, its molding temperature is relatively high, and the requirements for molds are also relatively strict. However, with the continuous advancement of processing technology, the processing difficulty of PC material has gradually decreased, and some new processing technologies such as injection molding and extrusion molding have been able to better meet the processing needs of PC material.

ABS material
Cost advantage: ABS material has low cost, which is one of the important reasons why it is competitive in the market. Its raw material price is relatively cheap, and the production process is simple, which is easy to mass produce. This makes ABS material the preferred material for mass production of standardized products, such as toys, daily necessities, etc. In the production of these products, low-cost ABS material can effectively reduce production costs and improve the market competitiveness of products.
Processing convenience: ABS material has good processing performance and is easy to form. It can be made into products of various shapes through a variety of processing methods such as injection molding, extrusion, and blow molding. Its molding temperature is low and the mold cost is relatively low, which allows manufacturers to design and produce products more flexibly and respond quickly to market demand.

 

 

2. Key factors for selection

Industrial/Outdoor Scenarios
Advantages of PC materials: In industrial and outdoor scenarios, the environment is often harsh and the performance requirements for materials are extremely high. PC materials have become the first choice due to their excellent comprehensive performance. Meeting the IP67 waterproof and dustproof rating means that products made of PC materials can completely prevent dust from entering and will not be damaged even if immersed in water of a specified depth for a certain period of time. For example, in outdoor electrical control cabinets, surveillance camera housings and other equipment, PC materials can effectively resist the erosion of rain and dust and protect the normal operation of internal electrical components.

Reaching the V0 flame retardant rating further enhances safety. In the event of a fire, PC materials can prevent the spread of flames and reduce the losses caused by the fire. In some industrial sites such as petrochemicals, strict requirements are placed on the flame retardant performance of equipment, and this feature of PC materials makes it more advantageous.

Actual case analysis: In a wind farm, the control system of the wind turbine needs to be installed in an outdoor control cabinet. Since wind farms are usually located in remote areas with complex environmental conditions, the control cabinet needs to have good protective performance. The control cabinet made of PC material can not only withstand strong winds, heavy rain and sand and dust, but also effectively prevent the spread of fire with the V0 flame retardant grade when a fire is caused by an electrical fault, thus ensuring the safety of equipment and personnel.

Household / Low-voltage electrical appliances
Analysis of cost performance of ABS material: For household and low-voltage electrical appliances, ABS material is favored for its high cost performance. In the home environment, most low-voltage electrical appliances such as televisions and audio equipment have relatively low requirements for material performance, and the good electrical insulation and mechanical properties of ABS material can meet basic needs. Moreover, its low cost allows electrical appliance manufacturers to reduce production costs while ensuring product quality, thereby improving the market competitiveness of products. For example, the outer shell of a TV is made of ABS material, which can not only ensure the beauty and texture of the appearance, but also effectively control costs.

Reasons for avoiding high temperature areas: Due to the poor heat resistance of ABS material (long-term use temperature ≤80℃), it is necessary to avoid high temperature areas such as radiators during use. If ABS material is in a high temperature environment for a long time, its performance will be degraded, such as reduced mechanical strength, poor electrical insulation performance, and even deformation and cracking. Taking the computer host as an example, if the ABS chassis is placed near the radiator, long-term high-temperature baking may cause the chassis shell to deform, affecting the installation and heat dissipation of the internal hardware.

2. Certification and Compliance
Advantages of PC material certification: PC material is easier to pass UL94 V0, RoHS and other certifications due to its own performance characteristics and production process. UL94 V0 certification is a strict test of the flame retardant properties of materials. The good flame retardant properties of PC materials make it more advantageous in the certification process. RoHS certification mainly focuses on the restriction of harmful substances in materials. PC materials can better control the use of harmful substances in the production process and meet the requirements of RoHS certification. For example, in electronic and electrical products, PC materials are often used to manufacture housings, display screens and other components. Passing these certifications can improve the quality and safety of products and enhance consumer trust in products.

Compliance requirements for ABS materials: For ABS materials, it is very important to ensure that they do not contain heavy metals (comply with REACH requirements). REACH regulations are strict EU regulations on chemicals, requiring that products must not contain heavy metals and other substances that are harmful to the human body and the environment. Some additives may be used in the production process of ABS materials. If they are not strictly controlled, they may cause the residue of harmful substances such as heavy metals. Therefore, manufacturers need to strictly control the quality of raw materials during the production process to ensure that ABS materials comply with the requirements of REACH regulations to ensure that products are sold in compliance with regulations in the market.

3. Customized electrical plastic boxes needs
Advantages of opening holes in PC materials: In terms of customized needs, PC materials are suitable for laser cutting precision opening. Laser cutting technology can accurately control the position and shape of cutting. For PC materials, high-precision opening can be achieved to meet the design requirements of different products. For example, in the manufacture of the shells of some electronic equipment, it is necessary to open heat dissipation holes, interface holes, etc. at specific locations. Laser cutting PC materials can ensure the dimensional accuracy and edge quality of the holes without significantly affecting the performance of PC materials.
Structural advantages of ABS materials: ABS materials are suitable for injection molding of complex structures. Injection molding is a commonly used plastic processing technology that can make ABS materials into various complex-shaped products. Due to the good fluidity and easy molding of ABS materials, some fine structural designs can be realized during the injection molding process, such as internal reinforcement ribs and buckles. These complex structures can improve the mechanical strength and assembly convenience of the product and meet the functional requirements of different products. For example, in toy manufacturing, ABS materials can be made into various realistic-shaped and complex-structured toy parts through injection molding.

 

 

3. Precautions for use and maintenance

Precautions for use and maintenance
Installation specifications
PC cabinet: avoid direct ultraviolet rays (anti-UV coating can be added), prevent strong acid/alkali contact.
ABS cabinet: stay away from high temperature sources (≥80℃ is easy to deform), and check for aging cracks regularly.
Maintenance recommendations
Use neutral solvents when cleaning, and do not use hard objects such as steel wool to scratch the surface.
Check the seal strip regularly (such as waterproof models) to ensure long-term protection performance.