{"id":3413,"date":"2022-03-30T12:25:58","date_gmt":"2022-03-30T10:25:58","guid":{"rendered":"https:\/\/mi.addevmaterials.com\/?p=3413"},"modified":"2026-02-24T16:42:02","modified_gmt":"2026-02-24T16:42:02","slug":"choosing-the-right-electrical-insulation-for-the-thermal-class-of-your-equipment","status":"publish","type":"post","link":"https:\/\/addevmaterials.com\/converting\/choosing-the-right-electrical-insulation-for-the-thermal-class-of-your-equipment\/","title":{"rendered":"Choosing the right electrical insulation for the thermal class of your equipment"},"content":{"rendered":"\t\t
In addition\u00a0to\u00a0ensuring a dielectric function\u00a0, an insulating material must also have a temperature resistance corresponding to the conditions of use of the equipment to be protected.\u00a0This ability is characterized by the thermal class and must be specified in the specifications.<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t The thermal class determines the maximum temperature for which an electrical insulator will maintain a certain thermal stability with respect to ageing.\u00a0It is therefore in a way the\u00a0<\/span>maximum temperature of use<\/span><\/strong>\u00a0recommended for an optimal lifespan of the insulation.<\/span><\/p> The thermal class of an insulator is defined by a letter, according to standard IEC 60085:<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t Warning<\/strong>\u00a0<\/strong>: the temperature displayed on the thermal class corresponds to the<\/span>\u00a0actual temperature at the level of the insulation<\/span><\/strong>\u00a0.\u00a0It must not be confused with the maximum ambient temperature or with the temperature rise, in the case of a transformer.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t Apart from the IEC 60085 standard, there are other standards for the classification of insulating materials which can be issued by certification bodies.\u00a0In this field, UL certification is one of the most prestigious marks of product conformity and a globally recognized safety mark, issued by Underwriters Laboratories\u00ae.\u00a0Thus, a UL-certified electrical insulator is assigned a\u00a0\u00ab\u00a0UL card\u00a0\u00bb which is in a way the insulator’s conformity passport<\/strong>\u00a0.<\/p> Regarding the thermal properties of the material, the UL card gives several indications:<\/p> Thus, to say of an insulating material that it withstands 130\u00b0C RTI means that under electrical or mechanical stress, after 60,000 hours the product will have retained at least 60% of its initial characteristics.<\/p> Warning<\/strong>\u00a0: it is important to remember that the thermal class values \u200b\u200bare not always equivalent between IEC 60085 and UL RTIs.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t The ideal electrical insulator is above all the one that will meet the specifications.\u00a0<\/p> The point on the 4 key criteria in the choice of an electrical insulator.<\/p> Insulating materials must of course have dielectric properties enabling equipment to be effectively protected. However, in some cases, it is essential that the chosen electrical insulation be able to withstand high temperatures. The best performance in dielectric terms will therefore not necessarily be sought and compromises will have to be found, in particular in terms of mechanical strength.\u00a0Learn more about the deterioration of the dielectric properties of insulators.<\/p> The choice of insulation is closely linked to the thermal conditions that it will undergo during its life. Indeed, an insulator can on the one hand degrade under the effect of heat and on the other hand its dielectric strength varies with temperature. Care must therefore be taken to respect the thermal class of the equipment when choosing the insulation.<\/p> The economic aspect is an important criterion to take into account when choosing an insulator because the differences in terms of costs can be great between two materials. The cost of a high-performance insulator can help the reliability of the isolated equipment and can thus make it possible to achieve significant gains on other stations making up the system.<\/p> It should be kept in mind that not all materials are created equal<\/strong> , even if their chemical composition is a priori identical.\u00a0For example, if all polyimides are more or less resistant to heat, the Kapton\u00ae brand remains a reference and a guarantee of quality because the manufacturer is engaged in a certification process guaranteeing consistently equal performance.<\/p> Discover the different types of electrical insulators.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t 4 types of electrical insulators offer interesting heat resistance capacities:<\/span><\/p> \u00a0<\/p> The polyesters alone will be able to accept operating up to temperatures of 160\u00b0C or even more depending on the duration of exposure. The standards announce 130\u00b0C for the IEC and 105\u00b0C for the UL.\u00a0For example, PET polyester performs well up to 105\u00b0C and PEN can still be used at 160\u00b0C.<\/span><\/p> \u00a0<\/p> Polyethylene is a good insulator but it cannot be used above 60\u00b0C\/RTI UL continuous, or 130\u00b0C\/IEC.<\/span><\/p> \u00a0<\/p> Polyimide is the most efficient polymer when looking for good electrical insulation at high temperature because it is able to withstand more than 400\u00b0C for several hours. The most well-known brand of polyimide is Kapton, available in the form of adhesives or film rolls.<\/span><\/p> \u00a0<\/p> To improve thermal performance, it is also possible to combine the advantages of several materials. Thus, the Nokamex Duplex is made up of an assembly of two materials:<\/span><\/p> \u00a0<\/p> The material obtained is thus an excellent insulator, usable at high temperature and with high mechanical resistance.<\/span><\/p> The ability of an electrical insulator to resist heat depends on several factors such as the chemistry of the material.\u00a0Polyimides thus have a temperature resistance of up to 400\u00b0C at thermal peak, whereas polyethylene cannot withstand high heat.\u00a0Moreover, the combinations of materials are endless.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t To choose the right electrical insulator, you must know the thermal class of the equipment to be protected.\u00a0The choice is then a matter of compromise between economic, thermal and electrical criteria.\u00a0Our experts have compiled all their advice in an\u00a0<\/span>ebook on high performance materials and electrical insulation!<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":" In addition\u00a0to\u00a0ensuring a dielectric function\u00a0, an insulating material must also have a temperature resistance corresponding to the conditions of use of the equipment to be protected.\u00a0This ability is characterized by the thermal class and must be specified in the specifications. What is the thermal class of electrotechnical equipment according to IEC 60085? The thermal class […]<\/p>\n","protected":false},"author":1,"featured_media":3421,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22],"tags":[],"class_list":["post-3413","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-marche"],"yoast_head":"\nWhat is the thermal class of electrotechnical equipment according to IEC 60085?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
UL certification of insulating materials\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
How do I choose the right insulation for my equipment?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
1. Dielectric properties<\/strong><\/h3>
2. The temperature of use<\/strong><\/h3>
3. The economic criterion<\/strong><\/h3>
4. Choose recognized materials<\/strong><\/h3>
What electrical insulators can withstand heat?\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
1. Polyesters<\/span><\/strong><\/h3>
2. Polyethylene<\/span><\/strong><\/h3>
3. Polyimide<\/span><\/strong><\/h3>
4. Rigid or flexible materials<\/span><\/strong><\/h3>
Conclusion<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t