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Aluminum LF HASL Base Printed Circuit Boards

Aluminum LF HASL Base Printed Circuit Boards

Aluminum LF HASL base printed circuit boards 1.company information Uniwell Circuits Co., Ltd is a professional fast Printed Circuit Board manufacturer. It was found in 2007 Shenzhen ,China. With 10 years’continuing innovation and development, we have now set a et up a powerful R & D team to...

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Aluminum LF HASL base printed circuit boards

1.Production describe


Aluminum LF HASL base printed circuit boards

2.Company information

Uniwell Circuits Co., Ltd is a professional fast Printed Circuit Board manufacturer. It was found in 2007 Shenzhen ,China. With 10 years’continuing innovation and development, we have now set a et up a powerful R & D team to improve its technology capability for high frequency, high TG, high CTI, impedance control, buried and blind holes, rigid-flexible combination material, aluminum base, and halogen free, etc.


3.Uniwell  PCB manufacturing technology


FR4,CEM-3,Metal Core,

Halogen Free, Rogers, PTFE

Max. Finishing Board Size

1500X610 mm

Min. Board Thickness

0.20 mm

Max. Board Thickness

8.0 mm

Buried / Blind Via (Non-cross)


Aspect ration


Min. Drilling Size(Mechanical)

0.20 mm

Tolerance PTH/ Pressing fit hole /NPTH

+/-0.0762 mm / +/-0.05mm / +/-0.05mm

Max. Layer Count


Max. copper (inner/outer)

6OZ/10 OZ

Drill tolerance


Layer to layer registration


Min. line width/space


BGA pitch


Surface treatment

HASL, Lead free HASL,

ENIG, Immersion silver/Tin, OSP

Product range:
2-40 layer of high-precision impedance, blind & buried layers, HDI boards, high frequency board, halogen-free boards, high-TG boards, aluminum, copper, iron base and ceramic-based circuit board, 1-6 layer flexible circuit board ( FPC) and rigid-flex flexible board, and other high-tech products.

4.Uniwell PCB quality control
What is IPC? Founded in 1957 as the Institute of Printed Circuits, IPC is the most respected organization known for its leadership and global footprint in providing standards and quality programs supporting the electronics industry.Most standard of it has been adopted by ANSI, and some is even approved to substitute the corresponding MIL standards by The United States Department of Defense.


IPC control

Uniwell control

Raw material









PCB thickness tolerance



Bow and Twist



Impedance tolerance


+/-10%, test coupon be provided

Circuit short/open



Conductor width



5.Uniwell PCB quality control system


6.Little knowledge---Surface treatment type

Finish Type: Electroless Nickel Immersion Gold
What is it?
This is a very thin amount of Gold applied over Nickel, also called Electroless Nickel Immersion Gold, or ENIG. The nickel is plated onto the copper prior to the application of Gold.  The nickel acts as a barrier to prevent the Gold and the Copper from migrating into one another.
The gold will disappear when soldered to as you are actually soldering to the nickel with the gold absorbed in the process.

Why is it used?
It is a very flat surface that is ideal for Surface Mount Devices (SMDs) and Ball Grid Arrays (BGAs). Gold is a great conductor of electricity.  Many contract assemblers prefer this finish.

What is the process used to apply the finish?
An Electroless process is used to apply this finish.  It is the depositing of a metallic coating onto a surface without the use of an electric current, relying instead upon a controlled chemical reaction.
It is typically applied after soldermask has been applied.  In some cases it is applied before but that is not typical. Obviously the cost is much higher if all copper is plated with gold and not just what is exposed after soldermask.

What are the critical measurements?
Nickel is plated 150 to 200 micro inches
Gold is plated 3 to 10 micro inches
Finish Type:Soft Gold
What is it?
Soft gold is commonly referred to as “wire bondable gold”.  It is softer than other gold finishes which allows it to be bonded to more easily for stronger and more conductive connections.
The gold does not disappear at the point of soldering or wire bond which produces a stronger welded joint.

Why is it used?
Primarily is necessary because of the need to do gold wire bonding.
What is the process used to apply the finish?
The process is electrolytic, that is it uses a current to apply the finish.  (similar to hard gold, but does not have the hardeners and brighteners added.)  It is typically applied before soldermask. 

What are the critical measurements?
It is 99.99% pure – 24 carat gold
The typical thickness is 30 micro inches of gold.  We can go up to 100 micro inches in increments of 10, but the most common use is at 30 micro inches.
Plated over 100 to 200 micro inches of nickel.

Finish Type: Hard Gold
What is it?
Hard Gold is an electrolytic process and has hardeners in it for durability.  It is plated over a nickel finish.
It may be referred to as Deep Gold. (the term Deep Gold is used to indicate that full panels are placed in the plating tank.)

Why is it used?
Due to its hardness, it can stand repeated use and is used most commonly for gold fingers.

What is the process used to apply the finish?
It is an electrolytic process and has hardeners added to it. A very active flux should be used when soldering to Hard Gold.

What are the critical measurements?
Typical is 98% pure 24-carat gold.
Nickel is 150 to 200 micro inches.
The gold is 30 to 50 micro inches thick.
General Gold Information:
Flash Gold:  Is hard gold with a maximum thickness of 3 micro inches. We can do this here but would require special handling.  Check with production on a case by case basis.
Body Gold: Indicates that the full body of the board is plated gold.  This may occur during either electro plating or immersion depending on the design.
Selective Gold: Indicates that a specific area in the interior of the board would be plated.  This does not include gold fingers.
Finish Type: Immersion Silver
What is it?
Purpose of this silver plating is to protect the copper from corroding as well maintaining its solderability.  It does have a shorter shelf life than some other finishes and must be shipped with separator sheets to prevent tarnishing.

Why is it used?

● Silver is the most electrically conductive metal available thus forming excellent interconnect surface.

● Immersion Silver process produces a really flat surface.  This is advantageous for SMD assembly.

● Excellent solderability, comparable to solder plating.

● Environmentally friendly lead free finishing.

● Ideal for high speed signals.

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