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Question

#1140
Subject: How do optical density measurements convert to conductivity measurements (ohm/square)?

How do optical density measurements convert to conductivity measurements (ohm/square)? What are the ohms/square values that correspond to the typical .2 - 4.0 optical density values of a typical metallized PET.

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#1142

In general as the OD increases the metal layer thickens and the resistance drops.

#1142
Author: Eldridge M. Mount III, EMMOUNT Technologies
Email: www.emmount-technologies.com
Subject: In general as the OD increases the metal layer thickens and the resistance drops.

A relationship for this on PET film can be found in the AIMCAL Metallizing Technical Reference which you can obtain from AIMCAL for about $25. In general as the OD increases the metal layer thickens and the resistance drops. This will not be a universal relationship for evaporated layers due to variations in deposition process and substrate but the behavior shown in the hand book should help you understand better and you may have to correlate your self with your product.

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