Solder Mask

Green Solder Mask

The green standard is still a common PCB solder mask option because it allows everything to be seen clearly. White text on the green background has a high amount of contrast, and the finish isn’t bright enough to reflect too much light, so there’s a reduction in glare. Green is a common choice for boards that must be inspected, plus some may find it to be an effective method to highlighting high-quality craftsmanship because the color does not get in the way of showing off the routing.

White Solder Mask

The green standard is still a common PCB solder mask option because it allows everything to be seen clearly. White text on the green background has a high amount of contrast, and the finish isn’t bright enough to reflect too much light, so there’s a reduction in glare. Green is a common choice for boards that must be inspected, plus some may find it to be an effective method to highlighting high-quality craftsmanship because the color does

Black Solder Mask

The green standard is still a common PCB solder mask option because it allows everything to be seen clearly. White text on the green background has a high amount of contrast, and the finish isn’t bright enough to reflect too much light, so there’s a reduction in glare. Green is a common choice for boards that must be inspected, plus some may find it to be an effective method to highlighting high-quality craftsmanship because the color does not get in the way of showing off the routing.

Red Solder Mask

The green standard is still a common PCB solder mask option because it allows everything to be seen clearly. White text on the green background has a high amount of contrast, and the finish isn’t bright enough to reflect too much light, so there’s a reduction in glare. Green is a common choice for boards that must be inspected, plus some may find it to be an effective method to highlighting high-quality craftsmanship because the color does not get in the way of showing off the routing.

Blue Solder Mask

The green standard is still a common PCB solder mask option because it allows everything to be seen clearly. White text on the green background has a high amount of contrast, and the finish isn’t bright enough to reflect too much light, so there’s a reduction in glare. Green is a common choice for boards that must be inspected, plus some may find it to be an effective method to highlighting high-quality craftsmanship because the color does not get in the way of showing off the routing.

Finishes

OSP

"OSP refers to Organic Solderability Preservative. It is the leading PCB surface finishing coating option used by the PCB industry for protecting Copper surfaces and its features that are exposed from oxidation before the PCB is populated. In the final stage of PCB manufacture, the boards are cleaned to remove any organic contamination, dust and finger prints. The surface is micro-etched to prevent any oxidation to the copper surface. It is then washed using DI water followed by OSP application and drying. Main advantages of OSP are excellent flat surface, inexpensive, environmental friendly and can be used in lead free soldering process. OSP finished boards have to be stored in proper storage conditions between 15 - 30deg C and 30% - 70% RH. They have to be used within 12 months of production"

Immersion Tin

"A coating of Tin is deposited on the copper layer of the PCB by means of an electroless chemical plating process. This protects the surface from oxidation thus increases the shelf life of the PCB. The PCB appears white after Tin coating. Tin finish supports any rework post PCB assembly. The process involves, pre-cleaning, micro-etching, preimmersion, Immersion Tin coating, post cleaning and drying. The drawback with Immersion Tin is poor solderability due to extended storage."

HASL

Hot Air Surface Leveling is a widely used surface finish, main advantages being, it is widely available and relatively economical. It provides excellent solderability and shelf life. It is harmful to the environment and violates ROHS compliance. The process involves, cleaning, flux coating,immersion of the PCB in a solder bath, blowing the excess solder using compressed air which flows through knife edge blades, cooling and post cleaning. The PCBs post HASL can withstand upto 265 deg C during its subsequent assembly operations.

LF-HASL

Lead Free Hot Air Surface Leveling is similar to HASL process, except in this case the solder used is lead-free alloy as against Tin-Lead alloy. This process confirms to RoHS and has higher temperature stability.

ENIG

Electroless Nickel Immersion Gold (ENIG) is a two layer metallic surface finish consisting of a thin layer of plated gold over a layer of nickel. Nickel is first electroplated on the PCB and then an immersion method is applied to cover the gold over the nickel. This results in a longer shelf-life of the PCB and provides high electrical conductivity due to the presence of gold.

Equipment/Production Machines

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Sawing
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Fully Auto Print/Etch line
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Guide Hole Drilling
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CNC
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Punching
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Scrubber
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Clean Room
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Laminator
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Developing
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Viaking
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Plated Through Hole
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Bare Board Testing
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Fly Probe Testing
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CNCV-Grooving
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LF HASL Line
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