OEM Supply Fr-4 Pcb - Hot-selling 2019 Hot End Fr4 Smd Flexible Circuit Board – Yongmingsheng

carry on to improve, to ensure merchandise quality in line with market and shopper standard prerequisites. Our firm has a high quality assurance program are actually established for Hot-selling 2019 Hot End Fr4 Smd Flexible Circuit Board, our products have good reputation from the world as its most competive price and our most advantage of after-sale service to the clients。
carry on to improve, to ensure merchandise quality in line with market and shopper standard prerequisites. Our firm has a high quality assurance program are actually established for 23 Years Pcb, Customized Pcb Printed Board, Whole-sale 94v0 Circuit Board, Now we have gained a lot of recognition among customers spread all across the world. They trust us and always give repetitive orders. Furthermore, mentioned below are some of the major factors that have played significant role in our tremendous growth in this domain.
Immersion Gold

The optimal process conditions were as follows: gold salt concentration (in gold terms)1g/L, organic amine concentration 0.2 mol/L, citric acid 5g/L, operating temperature 50-60℃, solution pH value 9 ~ 10, time control in 5-10min. Under this condition, the effect of chemical deposition is stable, and the color, uniformity and binding force of the deposited gold layer can meet the technical requirements of PCB industry. There is a Study suggests that mainly containing gold chloride acid and organic amine component without cyanide plating liquid system, not only from a technical point of view to meet today’s requirements of PCB industry to the chemical zedoary process, and from an environmental point of view to achieve the replacement of highly toxic chemicals, can significantly reduce the harm to environment, is a kind of has a broad application prospect of environmental friendly process.