PCB laminates: from categories to traceable materials
Order materials should specify brand/model, core and PP specifications, and copper-foil type and thickness. FR4, high Tg, low loss, and metal-based describe different dimensions; none alone is a complete material requirement. If substitutions are allowed, agree verification and approval conditions in advance.
| Material Direction | Key Metrics | Selection and validation |
|---|---|---|
| General/High Tg FR4 | Tg/Td, CTE, moisture absorption, and assembly thermal history | Align test methods and verify hole/interlayer structures |
| High-frequency/High-speed dielectric | Design Dk, Df frequency, and copper-foil roughness | Compare against actual link-loss and phase budgets |
| Mixed lamination material combinations | Curing and thermal expansion compatibility, bonding sheets | Confirm the process window before comparing complete costs |
| Metal base insulation layer | Dielectric thickness, thermal conductivity, voltage rating, and mechanical requirements | Calculate the thermal path and verify insulation |
| Environmental material requirements | Target-market requirements and declaration/report scope | Build an evidence matrix by actual model and lot |
Difference between typical data and procurement requirements
Typical dielectric parameters in material databases suit early planning but cannot replace datasheets or guaranteed procurement values for specific manufacturer grades. Calculation files record frequency, method, temperature, and material revision; label design Dk and measured Dk separately.
Material substitution approval process
First explain the substitution reason, then compare thermal, electrical, mechanical, and process parameters. Identify affected nets, hole structures, or insulation conditions before deciding whether recalculation, trial lamination, or new prototypes are needed. After approval, update the material table and manufacturing revision, and retain supply-batch records.
Inputs and outputs
Inputs include operating environment, thermal history, loss/impedance budgets, specified materials or substitution lists, stackup, and quantity. Outputs include material specifications, procurement gaps, substitution risks, and verification requirements; confirm actual inventory, authorized sources, and factory suitability per project.
FR4, High Tg, Rogers, Hybrid lamination, RoHS evidence, Submit materials and stack-up · PCB surface finish selection
Engineering reference | Digital PCB stackups: material databases and controlled manufacturing structures: methodological reference; third-party design methods or material documentation do not represent KFPCBA manufacturing capabilities.
Engineering reference | RO4000 material family: grades, cores, and bonding sheets: methodological reference; third-party design methods or material documentation do not represent KFPCBA manufacturing capabilities.
Material comparison: submit grades together with product conditions
| Application | Historical or reference material examples | Comparison Dimension | Required Attachments |
|---|---|---|---|
| General Multi-Layer / Higher Thermal Requirements | FR4, S1000-2M, TU-768／TU-872 | Thermal history, interlayer expansion, and hole structure; different grades are not interchangeable | Manufacturer model, core/PP, copper weight, and revision |
| RF Communication | Rogers 4350B, RO4003C, and others | Operating frequency, design Dk, loss, copper foil, and dielectric thickness | Frequency/method linked to datasheets and RF structures |
| Hybrid lamination | Actual layer sequences such as RO4350+FR4 | Material compatibility, thermal expansion, lamination, and dimensional scaling | Layer grade, bonding sheet, and material substitution approval |
| Rigid-Flex Combination | FR4+FCCL/PI and coverlay | Rigid/flex thickness, copper type, and installation or dynamic bending | Rigid/flex regions, adhesive systems, stiffeners, and bending conditions |
| Metal base / heavy copper | Metal core insulating layer or specified copper thickness | Thermal path, current, voltage rating, and mechanical requirements | Material models, insulation layers, and thermal-installation drawings |
These material names are not an inventory list. Record manufacturer typical values, procurement guarantees, and board-level measurements separately; do not infer arbitrary electrical performance from high Tg or a material brand.
RO4350B communication PCB configuration → Press-fit hole PCB → 18 Layer Communication PCB →
