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Why is there oil on the terminal harness
Time:2021-11-10 Read: 1123

First, we should distinguish the source of oil. If it is brought out of the mold, it will affect the electrical performance. If the raw material itself contains oil, it is painted by the raw material supplier.


After confirmation, it is the raw material itself with oil. So why do the raw material suppliers have to oil themselves?


Major name: lubricant

The lubricant is used to alleviate various failure mechanisms (corrosion and wear), reduce the insertion force of terminals, and do not affect the overall performance. Companies like TE have deep research on oil, and generally don't worry about it.

First of all, lubricant is money. Under such strict material cost control, you should first consider whether you are willing to spend this money.

Secondly, lubricants are not used casually, which depends on whether you can use them. If the lubricant fails, the lubricant will not provide the expected protection. In addition, the failure of lubricants may lead to other failure mechanisms (such failure mechanisms would not occur without lubricants). I understand that lubricant depends on whether you can use it. If you touch the following failure modes, you will lose more than you gain.


The causes of lubricating oil failure are as follows:

1. Temperature limit - lubricants used at too high or too low temperatures may cause their components to fail (evaporate at high temperatures or become waxy and brittle at low temperatures, etc.).

2. UV exposure - may cause decomposition of lubricant components.

3. Environmental reaction - The components contained in the lubricant may react with environmental pollutants (chloride, sulfide, etc.).

4. Incompatible manufacturing process - lubricating oil may be interfered with or removed by the manufacturing process of the connector (such as welding, cleaning, wiping), etc.

5. Aging - Some lubricant components may fail over time. When using lubricants, some specific lubricant failure mechanisms should be considered, as follows: component loss - one or more components of single-phase or multiphase lubricants or covers may fail due to evaporation or mechanical loss. These failures are caused by thermal stress, inherent chemical instability, surface tension driven migration (such as capillary wetting) and/or wetting, wiping, etc. The part of any lubricant or coating material or its components left on the surface may no longer provide the originally expected protection, and may cause terminal failure.

6. Low temperature solidification - lubricant has a temperature range below which the liquid lubricating material will become solid (this is the characteristic of lubricant). If this is the case, it will not cause failure itself, and small disturbance of the contact interface may cause the conductive surface to be supported by solid lubricant, resulting in electrical contact interruption. This failure of lubricant is related to the combination of lubricant properties (such as freezing point temperature), coating thickness, terminal design and use, etc.

7. Component failure - one or more components of a single or multi-phase lubricant or coating react with the environment and/or under the action of enzymes and decompose to produce volatile compounds or insulating paint film. Oxidized lubricating materials may no longer provide the originally expected protection. Due to its nature, oxides may cause contact failure or promote contact interface corrosion.

8. Component attack - Some types of lubricant additives may cause cracks/cracks in amorphous thermoplastic materials (such as polycarbonate and polyacrylonitrile).

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Shenzhen WENJIAN Electronics Co., Ltd

Address: 4th floor, No. 6, Shangliao Puyuwei Road, Shajing Street, Bao'an District, Shenzhen, Guangdong Province
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Fax: 0755-27281825
e-mail:luowenhong@wenjiancn.com
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Luo Sheng 15007550148

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