Introduction
Different PCB manufacturing processes require dry films with different performance characteristics. The training material classifies products into HC and HD series.
HC Series
The HC series is described as suitable for standard copper deposition, electroplating, and etching.
- HC-1525 and HC-1530: inner-layer and flexible board applications
- HC-1538: outer-layer direct etching and high-sensitivity applications
- HC-6540 and HC-6550: thick copper deposition and high-resolution applications
HD Series
The HD series is described as a high-sensitivity dry film series for LDI applications.
- HD-2333
- HD-7540
- HD-7550
How Should a Dry Film Be Selected?
Selection should consider PCB layer, flexible or rigid application, direct etching or plating, copper thickness, required resolution, exposure method, and process conditions.
Conclusion
Different dry film series are designed for different PCB manufacturing requirements. Specific grade selection should be confirmed against current manufacturer specifications.