What is the dielectric constant of silicone potting compound

Silicone electronic potting compound has excellent dielectric properties and high and low temperature performance, and is widely used in potting and pouring of electronic products such as power supplies, transformers, ignition coils, triggers and so on. High-quality silicone electronic encapsulants do not shrink, deform, and crack during long-term work.

Introduction of Dielectric Constant of Silicone Encapsulant
The dielectric constant of the silicone potting compound can be considered as a capacitor in the case of potting power. The dielectric constant of the general potting compound is 3.0-3.3 (1MHz). In simple terms, it is you Before the potting, the air is between the two circuits, then the dielectric constant is approximately equal to the dielectric constant of the air (such as 1.0). After potting, it is the dielectric constant of the potting compound (such as 3.0).

Assuming that the air capacitance between the two circuits before the potting is 0.1 pF, then the potting compound (dielectric constant 3.0) capacitance of the two circuits after the potting is 0.3 pF.

Silicone Encapsulant Dielectric and Flame Retardant Constant Standards
The flame retardant grade of addition molding can reach UL 94V-0, and the flame retardant grade of condensation type is UL 94V-1, which fully meets the requirements of EU ROHS directive. Attachment: UL flame retardant grade standard. The flame retardant grade is generally gradually decreased 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 a material to extinguish after being ignited. There are various methods for judging according to the burning speed, burning time, anti-dripping ability and whether the dripping beads are burning. Many values can be obtained for each tested material based on color or thickness. When the material of a certain product is selected, its UL rating should meet the thickness requirements of the wall part of the plastic part.

V-0: After two 10-second fire tests on the sample, the flame extinguished within 30 seconds and no burning matter could fall off.

V-1: After two 10-second fire tests were performed on the sample, the flame was extinguished within 60 seconds and no burning matter could fall off.

V-2: After two 10-second fire tests were performed on the sample, the flame was extinguished within 60 seconds, and combustibles could fall off.

H B: The lowest flame retardant grade in the UL94 standard. It is required that for samples 3 to 13 mm thick, the burning speed is less than 40 mm per minute; for samples less than 3 mm thick, the burning speed is less than 70 mm per minute; or to extinguish before the 100 mm mark.

It can be used stably for a long time in the range of -50 ° C to 250 ° C, which is suitable for the potting protection of module power supplies and circuit boards with high temperature resistance requirements. For example, V-0 potting compound can be used in HID lamp power supply potting, LED module potting, LED waterproof power potting, electronic module power potting, lightning protection module electronic potting, negative ion generator potting, Electronic potting, power supply potting of automotive ignition system modules.