PI is a candidate construction choice for labels exposed to soldering, cleaning or demanding dimensional conditions. It is not reserved for continuous heat combined with electrical insulation.
Compare the exact face, coating, adhesive and print system against the same process requirements. Colour, thickness and a bare-film temperature figure cannot decide the finished-label specification.
1. Separate identification from other functions
Start with the information that must remain readable and how it will be scanned. Then state heat, cleaning, fit and any additional component duty separately.
Electrical insulation, flame performance and static-control behaviour need matching grade and test information. An identification label does not acquire those functions simply because its face is PI.
2. Record the whole process
Include application conditions, peak and continuous temperature where relevant, dwell, repeated cycles, cooling, flux and cleaning. A short soldering peak can still disqualify an otherwise suitable-looking stock.
Compare PI, PET and other candidates only where their complete constructions have evidence for that sequence. Do not choose one solely from a cost or duration rule.
3. Compare candidates by task
The checklist below identifies questions for the trial. It assigns no service rating to an entire polymer family.
| Task | Information to supply | Acceptance focus |
|---|---|---|
| PCB process identification | Oven profile, cleaning and code layout | Bond and readable code after the full cycle |
| Equipment identification | Surface, service exposure and reading period | Adhesion, image and fit |
| Assembly with an electrical duty | Component function, grade, thickness and test requirements | Separate component evidence from label identification |
| Static-sensitive workflow | Required static-control properties of the construction | Specified face, adhesive and liner properties, not the PI name |
4. Approve fit, print and total applied cost
Use the actual thickness, dimensions, shape and surface to check conformity. Match the coating and ribbon or other print system and inspect the code after processing.
Material cost, conversion, printing, trial work and relabelling can all affect the comparison. A thicker or black film is not automatically the better grade. Keep the accepted sample and process record with the specification.
FAQ
Can a PI construction be used for reflow?
A suitable construction can be assessed. Confirm the actual profile, cleaning, substrate and printed sample; short exposure does not automatically qualify PET instead.
Does greater thickness prove better insulation or durability?
No. Thickness is one design input. Identification fit and any electrical function require their own grade information and acceptance checks.
Is every PI label suitable for static-sensitive work?
No. Confirm the required properties of the face, adhesive and liner for that workflow; the polymer name alone is insufficient.
What does the supplier need before proposing a sample?
The part surface, label space, printer and artwork, complete heat and cleaning sequence, required reading life and any separately specified component function.
References and next steps
Manufacturer references illustrate construction or system differences; they do not rate a quoted Bofmat grade. Checked 2026-11-04.
Related: anti-static labels · PI film labels · PET film labels · Heat and chemical exposure guide
Send the surface, process and acceptance requirements to discuss a sample construction.