FR-4 PCB
| Number of layers | 4 –14 layers standard, 18 layers advanced |
| Technology highlights | Multi-layer boards with a higher connection pad density than standard boards, with finer lines/spaces, smaller via Holes and capture pads allowing microchip to only penetrate select layers and also be placed in surface pads. |
| HDI builds | 1+n+1, 2+N+2, 3+N+3 |
| Materials | FR-4 high performance, Halogen-free FR-4, Rogers 4350B |
| Copper weights (finished) | 18um – 70um |
| PCB thickness | 0.40 mm – 3.20 mm |
| Maximum dimensions | 600 mm x 450 mm; dependent upon laser drilling machine |
| Surface finishes available | OSP, ENIG, EESPIG, HAL, LFH ASL Immersion Tin, Immersion Silver, Electroplate gold, Gold Fingers |
| Minimum mechanical drill | 0.15 mm |
| Minimum laser drill | 0.10 mm standard, 0.075 mm advanced |
| size | 10-20 |
FR in FR4 stands for flame retardant, whereas the number 4 differentiates the material from other materials in this class. FR4 is a fiberglass-reinforced epoxy laminated sheet, which looks like a thin, and woven cloth sheet. The term FR4 also stands for the grade used to make these laminated sheets. The fiberglass construction provides structural stability to the material. The fiberglass layer is covered with an epoxy resin that is flame-resistant. This lends durability and strong mechanical properties to the material.
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Description
FR in FR4 stands for flame retardant, whereas the number 4 differentiates the material from other materials in this class. FR4 is a fiberglass-reinforced epoxy laminated sheet, which looks like a thin, and woven cloth sheet. The term FR4 also stands for the grade used to make these laminated sheets. The fiberglass construction provides structural stability to the material. The fiberglass layer is covered with an epoxy resin that is flame-resistant. This lends durability and strong mechanical properties to the material.
