The CTI value (comparative tracking index) is an important parameter in assessing the electrical safety of a material. It measures a material's ability to resist electrical tracking, which are conductive paths that develop on a material's surface due to the presence of moisture, dirt, or other contaminants.  CTI values are particularly important when selecting materials for electrical and electronic applications, where safety and reliability are critical.

FR4 is a flame-retardant and high-temperature resistant composite material that is widely used in the production of printed circuit boards (PCBs) and other electronic components. Given its widespread use in electrical and electronic applications, understanding the CTI value of FR4 is critical to ensuring the safety and reliability of the final product.

So, what is the CTI value of FR4?

The CTI value of FR4 is usually rated at 175V or higher. This means that FR4 has a high resistance to tracking, making it suitable for applications where electrical safety is a concern.  FR4's high CTI value is attributed to its composition, which includes a combination of fiberglass cloth and epoxy resin. This composition not only provides FR4 with excellent electrical insulation properties, but also gives it the ability to withstand high temperatures, making it ideal for applications requiring thermal stability.

 FR4's high CTI value ensures that it can withstand high electrical stress without the risk of leakage or breakdown, thereby enhancing the safety and reliability of the electrical and electronic products in which it is used. This is particularly important in applications where the potential for moisture and contaminants is high, as materials with lower CTI values are more susceptible to tracking and failure under such conditions.

In addition to high CTI values, FR4 offers other desirable characteristics that make it a first choice for electronic applications. These include good mechanical strength, dimensional stability and resistance to chemicals and solvents. Additionally, FR4 is a cost-effective material that makes it an attractive option for manufacturers looking to produce high-quality electronics without compromising safety and performance.

In summary, the CTI value of FR4 is an important consideration when selecting materials for electrical and electronic applications. The higher the value, the more resistant the material is. The occurrence of errors due to leakage is minimized. The default CTI value for FR4 is 175 and goes up to 600 on special materials.Jiujiang Xinxing Insulation Material Co.,ltd is the leading manufacturer of epoxy fiberglass laminated sheet,the CTI of our FR4 sheet is up to 600,it will be a good choice for your electrician or electronic applications.Welcome to contact us to know more by sales1@xx-insulation.com