Prepreg fine fabrics

Fine fabrics are also available in prepreg form and these fabrics are typically carbon or glass or some other hybrid fabric. Typical properties are listed in Table 4.13 for a fine carbon fabric. 

Aramid-reinforced laminate and prepreg allow fast microvia hole formation and at the same time maintain the performance characteristic of a smooth surface for fine-line conductor imaging. The ablation speed of non-woven (aramid) laminates and prepregs is close to that achieved when using nonreinforced materials such as resin-coated foil, dry film, or liquid dielectrics. Since aramid laminates are very stable, they allow the fabrication of doublesided, very thin, etched innerlayers, which are then pressed to a multilayer package in a single... 

Fabrics provide a wide range of properties and are chosen for both ease of drape (fine being better than coarse) and fibre orientation. Prepreg systems are available with fabrics as well as fully aligned rovings. 

Other prepreg systems are described in Chapter 5. Because of the cost of the fibre, carbon fabrics generally tend to be fine and are not generally used in random mat form like glass. 

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