Halogen Free FR4: Defined Limits and Grade Evidence

Halogen-free FR-4 is a supplier-specific laminate system with a defined halogen-content claim. Material reference.

Defined Limits and Grade Evidence

For a board with a halogen requirement, state the applicable definition and evidence instead of relying on the words green or lead-free. Those descriptions do not all mean the same thing. Compare electrical and thermal performance separately from the halogen declaration.

Manufacturing and acceptance checks

Request the exact laminate and prepreg grades, current declarations and supporting test scope. Define the stackup, assembly profile and required flame performance. Approve substitutes only when both material-composition documentation and board-performance requirements are met for the proposed construction.

Compare related options

• High TG FR4
• FR4

Reference and scope

Isola: halogen-free laminate material category provides material or specification background. The checks above are purchasing guidance; final acceptance values must come from the agreed grade, product specification and condition.

Send a drawing and material requirements for review. Include quantity, critical dimensions and the inspection evidence required with delivery.