Topscom is a manufacturer for circuit boards with 2300 employees, we have received the TUV, UL, CE, Nemko, VDE, CB certification etc. Our price is so competitve moreover our quality is guaranteed, so many clients is so interested in our products. The circuit boards spec as follows:

Layers Single-sided PCB Double-sided PCB Multi-layers PCB 4-20
Copper thickness 1~2OZ 0. 5~10OZ 0. 5~10OZ
Material thickness 0. 6~3. 0mm 0. 2~3. 2mm 0. 35~3. 2mm
Flammbility rating 94V-0 94V-0 94V-0
Peel strength 10. 4N/cm 12. 3N/cm 12. 3N/cm
Warp and twist not less than1. 5% not less than1. 0% not less than1. 0%
Insulation resistor less than1GOhm less than1GOhm less than1GOhm
Test voltage 50-100DCV 100DCV 100-200DCV
Finished board area 400×500mm 560×600mm 560×600mm
Min line width/ spacing 0. 20/0. 20mm 0. 10/0. 10mm 0. 10/0. 10mm
Hole wall copper thickness not less than20. 0um not less than20. 0um
Minimum annul ring Inner 0. 05mm
Outer 0. 10mm 0. 076mm 0. 076mm
Min. Diameter 0. 60mm 0. 25mm 0. 20mm
Hole diam tolerance PTH 0. 076mm 0. 076mm
NPTH 0. 076mm 0. 05mm 0. 05mm
Hole position tolerance 0. 076mm 0. 076mm 0. 05mm
Out-lay tolerance Routing sign0. 15mm sign0. 15mm sign0. 13mm
Punching sign0. 15mm sign0. 15mm sign0. 15mm
Solder mask bridge not less than8mil not less than4mil not less than3mil
Solder mask hardness 6H 6H 6H
S/m solderability 245centigrade 5 Second 245C 5 Second 245C 5 Second
Hot immersionability 260C 10 Second 288C 10 Second 288C 10 Second
Surface plating OSP, HAL Flash Gold, Colophony OSP, Flash Gold, Immersion Gold, Gold Finger OSP, HAL, Flash Gold, Immersion Gold, Gold Finger
Quality spec GB/T. 4588, IPC-A-600F IPC-A-600F, IPC-ML-950 IPC-A-600F, IPC-ML-950