gudy® window is a unique, two sided mounting system with a permanent pressure sensitive on the first side and a glass removable pressure sensitive adhesives on the second. It is separated by a clear polyester carrier film. It is designed to provide bubble free mounting of double sided images onto window glass surfaces.

1. COMPANY CONFIDENTIAL Date: September 1, 2011
Technical Bulletin: gudy® window by SEAL Application Guide From: W. Decker
Description:
gudy® window is a unique, two sided mounting system with a permanent pressure sensitive on the first side
and a glass removable pressure sensitive adhesives on the second. It is separated by a clear polyester carrier
film. It is designed to provide bubble free mounting of double sided images onto window glass surfaces.
Quality Standards and Capability:
gudy window is a dual function mounting adhesive. The permanent adhesive, utilizing a siliconized paper
release liner, is designed to adhere to a wide range of surfaces from low energy films such as untreated
polyesters and polystyrene films to high energy coated products like inkjet medias. This permanent side is
durable and, once applied, cannot be easily separated from its contact surface.
The second side is a specially designed glass removable adhesive delivered with a proprietary embossed
release liner that enables easy air escape during application to glass surfaces. The adhesive is designed for
very low adhesive bond strength to high surface energy materials, specifically window glass. It is designed to
be easily removable and to not leave adhesive residue on the glass. It can also be easily and reliably
reapplied.
gudy window is designed to be uniform in clarity and adhesion to the intended substrates as described. It is
free of visual defects and contamination. It is intended for short term window glass mounting applications.
Application of gudy Window:
The removable adhesive system side of gudy window is specifically designed for window glass surface
applications. It is removable and can be reapplied multiple times. It is important that this adhesive be applied to
clean, dry surfaces free of solvents, dirt, dust etc. gudy window may also function on other high energy
surfaces where window glass equivalent surface energy is present. It is not intended for low energy surfaces
such as melamine cabinet surfaces, counter tops, polyolefin (PE, PP) surface and the like. These surfaces can
by characterized by their slickness, stain resistance, tendency to easily bead water, etc. gudy window’s
adhesion to these surfaces will be reduced and compromised.
gudy window must be applied with care to Polyacrylate sheet (PMMA a.k.a. Plexiglass) as adhesive
performance will be impacted by water in the Plexiglass.
gudy window is not designed for use on specially coated, low energy glasses used in electronics applications;
i.e.mobile phones and similar devices.
Surface Energy and Adhesion, a brief explanation:
For optimum adhesion, an adhesive must thoroughly “wet out” the surface to be bonded. “Wetting out” means the adhesive
flows and covers a surface to maximize the contact area and the attractive forces between the adhesive and bonding surface.
A lower surface energy material, such as water, will spontaneously wet out a higher energy surface, such as the un-waxed
hood of a car. A waxed hood, however, has a lower surface energy than water. The water beads up rather than wet out, reducing its
contact area with the surface.
For a liquid adhesive to effectively wet out a surface, the surface energy of the adhesive must be as low or lower than the surface
energy of the substrate to be bonded. Or, the surface energy of the substrate must be raised. Standard adhesive formulations
wet out and bond high surface energy (HSE) surfaces such as metal or ABS plastic, but fail to bond low surface energy (LSE)
polyolefins that include polypropylene and polyethylene. (thank you to Adhesives.org)