wholesale China silver coating pcb tin factory at discount

Company Advantages
1. In order to meet the standards of the heatsink industry, A-TECH has to go through a strict inspection process conducted by precise inspection equipment. It can be printed with numbers, names, data codes, logos, or other specific information
2. The product causes no environmental pollution and it can be recycled, which has a positive impact on the environment as a whole. It is widely used in different electronics industries, such as telecommunication and consumer electronics
3. This product contains no hazardous substances. The fabrics, yarn, and components or trims if any have all undergone a rigorous test for harmful chemicals. With a solder mask, it enjoys a good electrical insulation property
4. The product can resist high temperatures. It is made of heat-resisting fabric which features a high melting and decomposition point. A smooth part is added on its PTH line to reduce the roughness of through hole
5. The product is anti-slip. Its compounded materials offer certain skid resistance which provides better traction to the feet. It is lead-free and environmental-friendly and has passed SGS test

Immersion Tin, or Chemical Tin, it’s a RoHS Compliant metallic finish deposited by a chemical displacement reaction that is applied directly over the basis metal of the circuit board, the immersion Tin protects the underlying copper from oxidation over it’s intended shelf life, copper and tin however have a strong affinity for one another, the diffusion of one metal into the other will occur inevitably, directly impacting the shelf life of the deposit and the performance of the finish. The negative effects of tin whiskers growth are well described in industry related literature and topics of several published papers.

The typical thickness of Immersion Tin is ≥1.0UM and the shelf life is 6 months. The cost of Immersion Tin is more expensive than HASL but less expensive than Immersion Gold PCB and close to Immersion Silver. Similar to Immersion Silver, Immersion Tin is also sensitive in handling and storage, it requires PCB manufacturers to control and pack PCBs with Imm Tin more carefully.

The advantages of Immersion Tin

● Excellent flatness
● Mid range cost for lead free finish
● Good for fine pitch / BGA / smaller components
● Top choice for press fit technology
● Reworkable

The disadvantages of Immersion Tin

● Very sensitive to handling – gloves must be used
● Exposed Tin on final assembly can corrode
● Not good for multiple reflow/assembly processes
● Aggressive to soldermask – soldermask dam should be more than 5mil
● Baking prior to use can have a negative effect

A-TECH is capable of using Immersion Tin, we make the profile and electrical test before the process of Immersion Tin finish, and we use papers to separate each piece of boards to avoid scratches during package and transportation.

Company Features
1. A-TECH CIRCUITS Co., Ltd. is exceptional in R&D and technologies.
2. The company acts positively to the sustainable development plan for the environment. Apart from the fact that we have strict control over the production pollution amount, we also encourage customers and people to recycle and reuse their packaging bags or boxes. A-TECH CIRCUITS Co., Ltd.