Identify what the sheet actually describes
Determine whether the product is a copper-clad laminate, base film, coverlay, adhesive, shielding layer, or reinforcement. Record the exact grade and revision. Use the material library to place it within the regional construction. A film property does not automatically describe a finished copper-clad circuit or its added bonding and insulating layers.
Datasheet comparison worksheet
| Field | Keep with the value | Reason |
|---|---|---|
| Product identity | Grade, construction and revision | Avoids comparing unlike products |
| Electrical property | Frequency, specimen and method | Preserves the modeled context |
| Mechanical or adhesion result | Interface, conditioning and geometry | Defines what the test measured |
| Thermal information | Exposure duration and purpose | Separates processing from service |
| Result status | Typical, specified limit or measured sample | Prevents an unsupported guarantee |
Read the conditions before comparing numbers
For each relevant property, keep test method, specimen construction, frequency, temperature, conditioning, and units where supplied. Distinguish typical results from guaranteed limits and your own measured data. The peel-strength guide illustrates why an interface and test history matter. Do not rank two grades by a column of isolated values whose methods or constructions differ.
Translate data into a review question
Ask how the selected material will be processed and whether the finished construction meets the product’s duty. Separate soldering exposure from continuous service temperature, and coupon movement results from assembled-product endurance. Request missing grade-specific information from the supplier. Record accepted substitutions through the same review rather than treating materials in the same family as automatically interchangeable.
Before you release the design
- Save the exact supplier sheet used for the decision.
- Record absent conditions as open questions.
- Compare like constructions before interpreting differences.
- Link approved material choices to the released stackup.
Watch points
- A material datasheet is not a certificate of the site's manufacturing capability.
- A higher number is not necessarily better for the intended property or application.
Practical questions
Can a typical value be used as a procurement limit?
Only after an explicit agreement with the responsible supplier and customer. A typical published result does not itself establish a guaranteed delivered limit.
What if two datasheets use different methods?
Keep the methods visible and ask whether an appropriate comparison is available. Testing representative candidates under a common agreed method may be needed for the decision.
Technical references
References support the material or design context. Check the exact grade, part number, document revision and project conditions before release.Updated 27 September 2026 · Technical content policy · Engineering guidance supports project review; the agreed drawing defines the build.