Solder Mask Curing: Key Checks Before Release Solder mask curing is the sequence of tack dry, UV exposure and thermal bake that turns a printed liquid film into a hard, chemically resistant coating. Shorten a stage and the mask can pass a visual check while still being soft and under-reacted,…

Plating Throw: Key Checks Before Release Plating throw is the ratio of copper thickness at the centre of a hole to the thickness deposited on the surface of the same panel. A bath with good throw builds a hole wall that is nearly as thick as the surface copper, while…

Bad Mark: Key Checks Before Release A bad mark is a signal that tells the placement machine a unit inside the panel has already failed and must be left empty. The mark is applied after the electrical test or the inspection step that found the fault, and it travels with…

Solder Mask Curing: 6 Stages From UV Tack to Final Bake Solder mask curing is the sequence of tack dry, UV exposure and thermal bake that turns a printed liquid film into a hard, chemically resistant coating. Shorten a stage and the mask can pass a visual check while still…

Pattern Plating on PCB: 7 Controls That Fix Copper Thickness Pattern plating is the electrolytic step that builds copper on the traces and inside the drilled holes after the plating resist has defined which areas will be plated. It follows the electroless copper that makes the hole walls conductive, and…

Pick Height on SMT Feeders: 5 Setup Rules Pick height is the Z position at which the vacuum nozzle meets the component inside the tape pocket. The machine closes the vacuum at that point and waits for a pressure switch or a flow sensor to confirm that a part is…

Half Ounce Copper: Where 0.5 oz Foil Fits in a Stack-Up Half ounce copper is foil rolled to about 17.5 micrometres nominal thickness, half the weight of the standard one ounce foil. It is chosen when the design needs finer traces, a thinner finished board or a lighter panel, and…

Brown Oxide: Design Rules and Process Limits Brown oxide treatment is the chemical step that grows a controlled copper oxide layer on inner layer copper so the prepreg can bond to it during lamination. The copper leaves the line with a matte, dark brown surface built from fine dendrites. That…

Brown Oxide: 6 Rules for Multilayer Lamination Bonding Brown oxide is the copper oxide grown deliberately on inner layer copper before a multilayer board is pressed. Its job is not to glue the layers together; it is to give the prepreg a surface the resin can wet and grip, so…

Plating Throw: 7 Controls That Improve Copper in Holes Plating throw is the ratio of copper thickness at the centre of a hole to the thickness deposited on the surface of the same panel. A bath with good throw builds a hole wall that is nearly as thick as the…