When you paint a wall, you do not paint into an electrical outlet. A PCB is the board inside an electronic product that carries components and circuits. In wave soldering, its underside passes over a rising wave of molten solder so the right points are joined in one pass. Contacts that must stay solder-free—including the row of gold-colored edge contacts known as gold fingers—need to be covered first.
This page explains a public, general wave-soldering masking scenario. It does not show any customer’s production line or imply an existing commercial relationship.
You do not need to memorize material names. These four visual checks show what to tell us and how to test the first sample.
Solder must not touch hereJust as you cover outlets and door handles before painting, first mark the gold-colored edge contacts and any other PCB contacts that must stay clean.
The same tape may be applied to gold contacts, the green board surface, or exposed metal. Those are different surfaces, so start with the real PCB instead of guessing.
One minute and one hour are not the same. A tape experiences more than one number on a temperature display.
It may go through preheat, contact the solder wave, and then face another heating step. Temperature and time at every stage help us judge edge lift, residue, and clean removal.
SIHO publishes a 200°C for 1 hour condition for this amber polyimide tape.
Think of that number like a shoe size: it helps rule out an obviously wrong choice, but you still need to try the shoe on your own foot. PCB surface, soldering materials, and the actual heat journey can change the result.
Mask it, run the complete process, peel at the planned time, and inspect the protected area.
Do not stop at the words “heat resistant.” Check four real results: did solder stay off the target area, did an edge lift, was residue left behind, and was the removal timing right?
Then tell us the highest temperature, how long each heating stage lasts, and the approximate tape width. We can narrow the sample direction before you guess between product codes.
Daodao Technical contact — material selection & samplesYou do not need every technical term. A board photo, circled areas, temperature, and time are enough to begin.
