K.K.

The numbers yuour supplier mentioned are explained below:

1080 - 1.38 ozs/sq yd; thickness 0.0021 inch
1652 - 4.06 ozs/sq yd; thickness 0.0045 inch
7628 - 6.0 ozs/sq yd; thickness 0.0068 inch

Fabric weight, and thickness are of direct consideration for laminate
qualityand final properties whcih affect both electrical and mechanical
characteristics. These numbers represent the style of glass fiber, ie
diamete, number of fiber in a bundle, and weave type. Larger number mean
thicker cloth and diameter of yarn. Hope this helps.
----- Original Message -----
From: "KK Chin" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, May 05, 2000 11:06 AM
Subject: [TN] Prepreg numbering


> A PCB supplier recommended me to fine tune a  FR-4 multilayer lay-up to
make use
> of certain popular prepreg material. He named the prepregs by numbers like
7628,
> 1652, 1080, etc. Are these numbers common acronym, or just from a specific
> manufacturer's catalog? How can I decipher these numbers?
>
> Thanks,
>
> K.K. Chin
> Artesyn Technologies,
> Fremont, CA
>
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