The excellent dielectric and high and low temperature properties of silicone electronic potting adhesives make them widely used in the potting and casting of electronic products such as power supplies, transformers, ignition coils and triggers. High-quality silicone electronic potting adhesives do not shrink, deform or crack after long-term use.
Introduction to the Dielectric Constant of Silicone Potting Adhesives

The dielectric constant of silicone potting adhesives, when used to pot power supplies, can be regarded as a capacitor. Generally, the dielectric constant of potting adhesives is 3.0 - 3.3 (1MHz). Simply put, before potting, the space between two circuits is filled with air, so the dielectric constant is approximately equal to that of air (such as 1.0). After potting, it is the dielectric constant of the potting adhesive. Suppose the capacitance value of the air between two circuits before potting is 0.1pF. Then, after potting with the potting adhesive (with a dielectric constant of 3.0), the capacitance value is 0.3pF.
Standards for the Dielectric and Flame Retardant Constants of Silicone Potting Adhesives The addition type flame retardant level can reach UL 94V - 0, and the condensation type flame retardant level is UL 94V - 1, which fully complies with the EU ROHS directive requirements. Attachment: UL flame retardant grade standards. The flame retardant grades generally decrease from V - 0, V - 1, V - 2 to HB. The flammability UL94 rating is the most widely used flammability standard for plastic materials. It is used to evaluate the ability of materials to extinguish after being ignited. There are various evaluation methods based on burning speed, burning time, dripping resistance and whether the dripping beads burn. Each tested material can have many values according to its color or thickness. When selecting the material for a certain product, its UL grade should meet the thickness requirements of the plastic part wall. V - 0: After two 10 - second combustion tests on the sample, the flame extinguishes within 30 seconds and no burning material should fall. V - 1: After two 10 - second combustion tests on the sample, the flame extinguishes within 60 seconds and no burning material should fall. V - 2: After two 10 - second combustion tests on the sample, the flame extinguishes within 60 seconds and burning materials can fall. HB: The lowest flame retardant grade in the UL94 standard. For samples 3 to 13 mm thick, the burning speed should be less than 40 mm per minute; for samples less than 3 mm thick, the burning speed should be less than 70 mm per minute; or the flame should extinguish before the 100 mm mark. It can be stably used in the range of - 50℃ - 250℃ for a long time, which is suitable for the potting and protection of modular power supplies and circuit boards with high temperature resistance requirements. For example, only V - 0 potting adhesives can be used in the potting of HID lamp power supplies, LED module potting, LED waterproof power supply potting, electronic module power supply potting, lightning protection module electronic potting, negative ion generator potting, ballast electronic potting, automotive ignition system module power supply potting, etc. What is the dielectric constant of silicone potting adhesives?