This paper briefly introduces the requirements about the insulation system of electronic product, and describes the importance of functional check and Dielectric strength in safety test.

This article analyzed the test of working voltage of audio and video appliances in IEC60065:2005, describe how to determine the minimum clearance distances and creepage distances base on working voltage, as well as determine testing voltage of dielectric strength by the curves given in IEC 60065.

Materials of good insulation (ρ v>10 12 Ω·cm at room temperature, ρ v>10 8 Ω·cm at 500℃), high electric strength (E j>15kV/mm) and thermal stability can be obtained by mixing Zn-V-B low softing point glass system with Al 2O 3 at certain weight proportion.

The connectivity test,insulation test and dielectric strength test of cable has also been realized.

Effect of deposition on the tensile strength of tungsten alloy;

Prediction of tungsten tensile strength with artificial BP neural network method;

Influence of sintering parameters on tensile strength of warm compacted Fe-2Ni-2Cu-1Mo-1C material;

Effect of the size and the proportion of gas coal and coal-char on the consist-compressive strength of formed coke;

Influence of pressure head roughness upon compressive strength and test result dispersion of single crystal diamond;

Relation between compressive strength and fractal dimensions of jointed rock-mass;

The detecting system of stress wave velocity for laminated veneer lumber bending strength based on single chip;

Analysis on bending strength of PcBN composite;

Effect of pore-forming agents content on bending strength of SiC/Al composites;