Firstly take and look at the procelain lamp holder, good feel very heavy, porcelain lamp holders wall thickness, the most critical internal must be copper contacts, the contacts flexibility is better, by hand or stick pressure shrapnel, take a look at the elasticity. But the shrapnel can not be too thin, in particular is used in the light source above 250W, to consider whether it can long withstand large current startup. Screw bulb test with the lamp, to see whether the screw can clench lamp, and whether it can be screwed into place. After a few steps, I think you can judge the quality of the lamp holders, http://www.lampholder.net (http://www.lampholder.net)

Alumina porcelain lamp holders having a high mechanical strength, hardness and electrical resistivity, good electrical insulating properties and excellent chemical stability. But brittle, resistant to temperature shock becomes poor. The achievements by adding nano alumina ceramic material to improve and enhance the overall performance purposes. The results of the innovation that does not change the formula and process of actual production of ceramics, simply by adding nanomaterials directly in the mixing stage, or in the ingredients used to replace some or all of the nanomaterials original ceramic formulations coarse grain materials. The outcome of a wide range of applications, both can be used for traditional ceramics, can also be used for high-performance alumina ceramic modified.

Due to the addition or substitution is relatively low, the product is very significant economic benefits. The alumina Houmodianlu is a major foreign currency earner for China's electronics industry. Domestic alumina the basic poor performance, Japan export Houmodianlu substrate. The results of the study show that, add 5% nano-alumina ceramic substrate thermal stability can be increased by 2-3 times, the thermal conductivity is increased by 10-15%, the flatness of lamp holders can improve stroke 1.5.

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