Optical Properties
Numerous postal services prefer the optical properties found in PROCITE film; some even specify film with those characteristics. Optical properties are also crucial for envelopes sent internationally.

To assist in your film specification, please see the following articles:

US Postal Service Publication 25 Designing Letter and Reply Mail
"Low gloss polyclear materials are best."

CEN TC331 Postal Services - Committee for European Normalization

"The gloss of the address zone should be kept to a minimum."

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