Which is better, waterproof liquid silicone or O-ring for mobile phone battery cover?

In terms of waterproofing for mobile phone battery covers, liquid silicone and O-rings each have their unique advantages and applicable scenarios. Here is a detailed comparison between the two:
Liquid silicone gel

Performance advantages:

Liquid silicone rubber (LSR) has good fluidity and is easy to injection molding.
It has excellent thermal stability and cold resistance, and can maintain stable performance over a wide temperature range.
Good electrical insulation performance and no toxic substances are produced during combustion.
Good elasticity, can cushion external pressure, and provide better sealing effect.

Technological advantages:

The liquid silicone waterproof structure is simplified, the overall structure is more compact, and the assembly accuracy and repeatability are high.
It can be secondary molded with materials such as metal and plastic, with high bonding strength, multiple disassembly and assembly, easy replacement, and stable waterproof performance.
The waterproof level of liquid silicone injection molding can reach level 5 or above, or even higher.

Application case:

Liquid silicone has been widely used in waterproof structural components such as mobile phone battery covers and card holders.
By combining with materials such as metal and plastic, a waterproof machine component with high waterproof rating and compact structure has been formed.

O-ring

Performance advantages:

O-rings are usually made of rubber materials such as nitrile rubber, EPDM rubber, etc., which have good wear resistance, oil resistance, and weather resistance.
It has a self sealing effect and does not require periodic adjustment.
Static sealing can achieve zero leakage.

Structure and Applicability:

O-ring has a simple structure, small size, easy installation and disassembly, and compact installation location.
Strong adaptability, versatile use, and affordable price.
However, it is difficult to ensure zero leakage during dynamic sealing of O-rings, and their leakage can only be controlled to not exceed the specified allowable value.

Precautions for use:

When installing O-rings, attention should be paid to parameters such as groove design, surface roughness, and clearance to ensure their sealing performance.
In special places, it is often necessary to install protective rings and dust seals.
general comparison

Waterproof performance: The waterproof level of liquid silicone injection molding is usually high, which can meet the waterproof requirements of components such as mobile phone battery covers. Although O-rings also have some waterproof performance, it may be difficult to ensure zero leakage during dynamic sealing.
Compact structure: Liquid silicone can be secondary molded with

materials such as metal and plastic to form a compact waterproof machine component. Although O-rings have a simple structure, they require a certain amount of space for installation.
Cost and maintenance: The process of liquid silicone injection molding is relatively complex, and the cost may be high. But once formed, its waterproof performance is stable, and it can be disassembled and replaced multiple times, making it easy to replace. Although O-rings are inexpensive, they may require periodic inspection and replacement during use.

conclusion

In summary, liquid silicone and O-rings each have advantages in waterproofing mobile phone battery covers. Liquid silicone is highly favored for its excellent waterproof performance, compact structure, and stable performance, especially suitable for components such as mobile phone battery covers that require high waterproof levels. O-rings, on the other hand, have certain application value in certain situations due to their simple structure, low price, and strong adaptability.