Fitaovana elektrônika tsy mipoaka amin'ny plastika

Ao amin'ny sehatry ny fitaovana ara-drafitra injeniera, indrindra amin'ny plastika engineering, it’s crucial to assess not just their mechanical and electrical characteristics, fa koa ny fahamarinan-toerana mafana sy ny fahaizany manohitra ny herinaratra static.

Thermal Stability

For explosion-proof electrical equipment, the plastic materials used in casings are required to demonstrate superior thermal stability. In specified testing conditions, the maximum temperature decrease should be 20K compared to the Temperature Index (TI) at 20000 hours on the heat resistance curve.

Anti-static Capabilities

Plastic materials must possess effective anti-static properties, which include measures to avert the generation and accumulation of static electricity. This can be achieved by adding appropriate conductive additives to lower the material’s volume and surface resistivity. When tested under specified conditions (10mm electrode distance), if the surface insulation resistance of modified plastic components does not exceed 10Ω, the material is deemed effective in preventing static build-up.

Beyond modifying the plastic material, static fire hazards can also be mitigated by limiting the exposed surface area of plastic casings (or parts) amin'ny fitaovana elektrika tsy misy fipoahana. LOHA 1 details the limits on the maximum surface area of plastic casings (or parts), while Table 2 specifies the diameter or width of elongated plastic parts, and the thickness of plastic coatings on metal surfaces.

Maximum Surface Area for Plastic Casings (or Parts)

Maximum Restricted Dimensions for Special Plastic Parts