Window material

If you’re using window envelopes, make sure that you cover all windows with transparent material.

Transparent window material requirements

The transparent window material must have:

  • Enough transparency to allow visibility with a haze up to 75%
  • Uniform clarity
  • No wrinkles, creases, or blemishes
  • A gloss reading (on the side facing out) of 159 gloss units or less