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Why do printed circuit boards use red glue?

Why do printed circuit boards use red glue?

The printed circuit board adhesive is also a pcb assembled red plastic, usually a red (also yellow or white) paste uniformly distributed with a hardener, a pigment, a solvent, etc., mainly used for the patch processing element. The device is attached to a printed board and is typically dispensed by dispensing or stencil printing. After the components are attached, they are placed in an oven or reflow oven for heat hardening.

pcb assembly
The pcb assembled patch adhesive is cured after being heated, and the solidification temperature of the pcb assembly process is generally 150 degrees, and the heating does not dissolve, that is, the thermal hardening process of the patch processing is irreversible. The pcb assembly effect may vary depending on the heat curing conditions, the connected object, the equipment used, and the operating environment. The patch adhesive is selected according to the printed circuit board assembly (PCBA processing) process.

pcb assembly
Patch processing red glue is a chemical compound, the main component of which is polymer material. Pcb assembly of fillers, curing agents, other additives. The pcb assembled red plastic has viscosity fluidity, temperature characteristics, wetting characteristics and the like. According to this characteristic of the red glue assembled by pcb, in the production, the purpose of using red glue is to make the part firmly adhere to the surface of the PCB to prevent it from falling.
SMD processing red glue is a pure consumable material, not a necessary process product. Now with the continuous improvement of surface mount design and process, through-hole reflow soldering and double-sided reflow soldering have been realized, using pcb The placement process for assembling patch adhesives is becoming less and less.

Mar-19-2019

FASTPCBA