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Guidelines for Selecting Core Constructions for Multilayer Printed Wiring Board Applications
1 SCOPE
1.1 Purpose
This specification defines guidelines for selecting core constructions in terms of fiberglass fabric style and configuration for use in multilayer PWB applications. Each core construction is given a registration number for ordering purposes. Every effort shall be made to periodically review the construction guideline and include or exclude constructions based on current data.
1.2 Recommendations
This document groups the core constructions into categories based on relative nominal thickness. Within a nominal thickness category, the different core constructions are characterized in terms of resin content, dielectric thickness, glass transition temperature (Tg), availability, and cost. The core constructions are also compared for performance attributes, including machinability, dimensional stability, Z-axis expansion, measle resistance, chemical resistance, and flatness.
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