Somebody may not know the different between counterbore and countersink on PCB.
Both are used to mount nails to keep the PCB in the suitble position.
The cross-section of the counterbore looks like letter “T”, but the countersink looks like a funnel.
Pls see the below picture:
PCB counterbore
PCB countersink
Pls visit our website if you have more questions about PCB.
Normally PCB which only one conductor is single layer PCB. Common conductor are copper , AgPd (Silver Palladium) AuPd (Gold Palladium ), Al(aluminum). Normally, for FR4 PCB, metal core PCB and Flexible PCB, the conductor are copper. For ceramic PCB, the conductor can be copper, AgPd and Aupd. Here some common structures for your reference.
single side FR4 PCB
single side ceramic PCB
Of course, there are some special circumstances, even only one conductor, but they are not single layer PCB, they are named Dual Access PCB.
For example:
dual access FR4 PCB
Yes, we can make the MCPCB without solder mask! How to do MCPCB without solder mask?
Top: copper foil
Middle: dielectric layer
Bottom: Aluminum or Copper or Iron substrate
3 w m/k dielectric layer is light blue
2 w m/k dielectric layer is white
MCPCB without solder mask have no bad influent the function of the board, so solder mask with or without, only depends on your requirement.please visit for metal core PCB if you would like to know more.
According to the JPCA – ES – 01-2003 standard: chlorine (C1), bromine (Br) is less than 0.09% Wt (weight ratio) of the copper clad, defined as halogen-free copper clad. (at the same time, the CI + Br total less than 0.15%Â [1500 parts per million])Â Most of the halogen free materials are mainly composed of phosphorus and phosphorus nitrogen.when the phosphorus resin burning, it will thermal decomposition by heating and generate partial poly phosphoric acid,the partial poly phosphoric acid have strong dehydration property to come into being the carbon film on the surface of the high polymer resin,to insulated resin burning surface is exposed to air, that the fire is extinguished, flame retardant effect.
S/M means solder mask, it is a kind of the Liquid photosensitive ink, it is the green, yellow, red, black or white color on PCB surface. We print solder mask on the PCB surface that no need soldering, and then drying and curing.
With solder mask, the Tin won’t stick to the PCB.
The aluminum PCB is a unique metal base copper clad laminate , it has good thermal conductivity, electrical insulation properties and machining property.
The structure of aluminum PCB is divided into three layers.
First layer: base layer, it is the metal substrate, which can choose copper or aluminum.
Second layer: dielectric Layer, its thickness be from 0.003 inch to 0.006 inch.
Third layer: circuit layer, the copper thickness of the circuit is from 1oz to 10oz.
The advantage of aluminum PCB:
The disadvantage of aluminum PCB:
Aluminum core PCB have good thermal conductivity but Ceramic PCB will better,if you would like to know more about the different from FR4,MCPCB and Ceramic PCB,pls visit to for more information.
Good news! Our company Video of PCB & SMT was online now! Â You can see our team member, facility, production capability (includes FR4 PCB, Metal Core PCB, Ceramic PCB, Flexible Circuit, SMT (PCBA), to see how we continue to improve ourselves, to provide best service to our customers.
Please watch the following video on YouTuBe if you cannot open the above video.
Remember Best Technology will be your best choice of printed circuit board, most reliable partner in China!
Welcome to contact us today for more inquiries of various circuit boards.
As is well known, solderability is very important for any type of printed circuit boards, we must do solderability test of each batch PCB we made. In this way we can inspect the weldability of the PCB before we go ahead the assembly process, much helpful for SMT.
In our circuit board manufacturing workshop, we have professional equipment to do that testing. But normally these equipment was expensive, and a lot of people want to know a simple and cheap way to do that solderability testing, so today we are doing a simple solderability test and show you all the steps.
1. Take a small solder pot, plug in the power, turn on the switch and heat the solder pot to a certain high temperature(about 8 minutes).
2. Put a tin bar to the solder pot, then you can see the tin bar is begin to melting, slowly into liquid tin, then more and more.
Tin Bar
3. After few minutes, there will be enough melting liquid tin in the solder pot to do this test.
melting-tin
4.Use a tweezers to pick up a PCB circuit, first clean the PCB with rubbing alcohol. Because the unclear surface or the oxidation of the PCB will affect the test result.
5. This is the key step of this test, put the PCB into the solder pot, depth about 2 mm,time 4-5 seconds is ok. Then you can see the tin will go into the hole of the PCB.
Solderability Test 1
Solderability Test 2
6. Take out the PCB from the solder pot and put it into the cold water. After few seconds, you can see the experimental effect.
Test Results
This solderability test is very simple and easy. We can see the results very soon. We, Best Technology did solderability of every batch PCB we made, and we also supply our customers with the solderability test report and the test samples.
Any comments about that, leave your message or write email to us. Best Technology, always to be your best partner of circuit boards in China!
