source:Industry News release time:2022-09-14 Article author:yu Popular:pcb
1. Explanation of terms: Military grade A-grade sheet material: refers to the sheet with the highest grade of a sheet manufacturer, the insulation of the sheet, the uniformity of the sheet, the reliability of the copper skin and the sheet substrate, and the impedance stability of the sheet , far higher than the B-grade materials and C-grade materials in similar products, and can be used to produce military electronic products with absolutely demanding requirements!
Low-grade sheet B-grade material and C-grade material: sheet manufacturers, because of the low-cost demand of PCB circuit board manufacturers, produce sheet materials, this kind of sheet material, the sheet material manufacturers use shoddy and cut corners in the manufacturing process Case! In terms of performance stability, the price of A-grade materials is far lower than that of military-grade materials.
Second, the general plate manufacturers' plate grades are divided:
Grade A: The best grade board, meeting the military-grade requirements, industrial requirements, and quality assurance;
Class B: low-grade sheets are used for low-grade civil use without quality assurance;
Grade C: The lower grade is purely for cost, and there is no guarantee of quality.
3. Composition of FR-4 (PCB circuit board) sheet
1. Glass fiber cloth;
2. Resin;
3. Copper foil.
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