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HASL, the full name is Hot Air Solder Leveling, it’s one of the traditional surface finish on printed circuit boards with long successful history.

To make the HASL finish, the circuit boards will be submersed in molten solder(Tin/Lead). This solder will cover all the exposed copper surfaces. Upon retraction from the solder, high pressure hot air is blown over the surface through air knives, this levels the solder deposit and removes the excess solder from the surface of printed circuit boards.

HASL (Tin/Lead) surface finish is not RoHS Compliant, so it can be only available where RoHS exemption is permitted. The typical thickness of HASL is 1-40um, and the shelf life can reach to 12 months.

The advantages of HASL surface finish

● Excellent solderability / wettability
● Good reflow properties
● Low cost in manufacturing
● Large processing window is allowed
● Multiple thermal excursions
● Can be widely used

The disadvantages of HASL surface finish

● Uneven surface
● Not suitable for PCBs with fine pitch
● Thermal shock
● Not RoHS Compliant
● Solder bridge
● Plugged or Reduced plated through holes

A-TECH have HASL surface finish in house, it’s mainly used to build single sided or double sided PCBs with high solderability requirements but low manufacturing cost and without RoHS Compliant requirement.

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A-TECH enig black pad undergoes a series of the strict assessment process which includes flammability tests, rain resistance test, ventilation test, and marking and labeling guidelines.

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All of the mechanical components of A-TECH enig black pad are manufactured under sophisticated workmanship. The workmanship includes material preparation, material cleaning, cutting, stamping, spraying, and surface treating.

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The manufacture of A-TECH enig black pad is of professionalism. The multistage production process is adopted. Its design, production, assembly, and testing will be controlled by separate teams.

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The workmanship of A-TECH enig black pad carefully conducted. It should go through timber cutting, tenoning, trepanning, pressing, or high-speed milling processes.

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A-TECH enig black pad has been tested. It is tested and certified by the National Sanitation for Food Safety and Food Contact under the NSF 51 Certification.

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To design enig black pad should follow such principles which are: enig black pad.

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