Introduction to commonly used materials in connectors

The cable connector usually use materials such as PC, PBT, PA66, PPS, LCP, etc., but in principle, production usually use better flame resistance materials.

1.main material

1. PBT

It is a commonly used glue stock for connector products. Generally, 20-30% glass fiber is added to PBT material to make it have anti-cracking, anti-shock, anti-electricity, good wear resistance, low friction coefficient, good self-lubricating effect, good oil and chemical resistance. It has good dielectric strength under high temperature and high humidity. Its shrinkage rate is between 0.6% and 3.0%, and its temperature resistance is about 230 °C. Good formability and flame resistance.

1. NYLON66、NYLON6T、PC、LCP:

Its shrinkage rate is 1.0%-0.3%, temperature resistance is higher than PBT, commonly used NYLON66 temperature resistance 260 °C--280 °C, NYLON6T temperature resistance 280 °C--300 °C, LCP temperature resistance 290 °C--320 °C. However, it has a large water absorption, and is generally used for products with high temperature resistance and less PITCH (such as SMD, HOUSING, PLCC, etc.)

1. ABS

It has good impact toughness, oil resistance, wear resistance, easy molding, good hardness, good rigidity and temperature resistance of about 100 °C. It is generally used in auxiliary products in connectors.

2.Connector contact parts composition and performance

Bonding material: Metal body material for plugs. In general, brass is used. In order to increase the number of durability and life of connectors, phosphor bronze and beryllium copper are usually used.

The following is an introduction to the types and properties of copper in the industry:

1. Brass - an alloy of copper and zinc, the color varies depending on the amount of zinc
2. 25~35% zinc, it is most suitable for normal temperature processing.
3. 35%~45% tin, suitable for processing at room temperature, for example, copper plates sold on the market, copper rods
4. Bronze----the alloy of copper and tin, the color of which varies with the tin content.

In general, we refer to copper alloys other than brass as bronze.

Phosphor bronze-----Phosphorus in bronze, with anti-friction, but too much phosphorus, it will cause casting difficulties, its composition is 8~12% tin, phosphorus 0.5~1.5%.

Selection of contact materials:

The contact parts can be made of any of several alloys, depending on the type of contact part, durability and electrical and environmental conditions in which the connector is operated.

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Some commonly used materials and applications are as follows:

1. Brass - Although brass is a material with good electrical conductivity, it is easily deformed and rapidly aged after repeated bending. It is typically used as a fixed contact part in an inexpensive connector or as a metal part in a connector.Therefore, connectors using brass as a contact part are not suitable for use in applications where elasticity is required. Of course, due to the low cost, many factories still use brass as contact part in connectors
2. Phosphor Bronze - Phosphor bronze is harder than brass and retains its long-lasting elasticity. It is often used as a material for contacts that operate at temperatures below 300 °F. For most connectors with low durability or where the contacts are in normal bending, the use of phosphor bronze ensures good reliability.
3. Beryllium bronze - beryllium bronze has a much higher mechanical properties than brass or phosphor bronze. Bronze bronze parts can be shaped and hardened after annealing, and can actually retain their shape forever. It is also the most resistant to mechanical fatigue. In the case of durability and high reliability applications, beryllium bronze is recommended.