Applied Flat Glass Standards

1. Installed film on flat glass surfaces is not expected to have the same level of visual quality as glass.
The following criteria apply to the installed film only and not to any defect inherent in the
glass.

2. Installed film has a discrete time for full adhesion to be effected since installation utilizes a
detergent solution in the water to float the film onto the glass: the excess water is squeezed out,
but inevitably residual water will remain between the film and glass. The time to achieve full
adhesion is often referred to as "the adhesive cure time". Adhesive will be increasing from a lower
value during this time. Visual and adhesive cure time is related to thickness of the film and various metallic coating on the film. Typical visual cure times may be extended or shortened according to
climatic conditions.

3. Inspection for optical quality can be made before full visual cure is attained. Table 1 provides a
guide for typical visual cure times. It should be noted that effects during cure, such as water bubbles, water distortion and water haze are not to be regarded as defects.

4. The glass with applied film shall be viewed at right angles to the glass from the room side, at a
distance of not less than 6 feet (2 metres). Viewing shall be carried out in natural daylight, not in
direct sunlight and shall assess the normal vision area with the exception of a 2 inch (50mm) wide
band around the perimeter of the unit.

5. The installations shall be deemed acceptable if any of the following are unobtrusive (effects
during visual cure should be disregarded): dirt particles, hair and fibers, adhesive gels, fingerprints,
air bubbles, water haze, scores and scratches, film distortion, creases, edge lift, nicks and tears. Inspection may be made within 1 day of installation the film install. Obtrusiveness of blemishes shall
be judged by looking through the film installation under lighting conditions described in 4.

                    IWFA International Window Film Association
                    P.O Box 3871, Martinsville. VA 24115-3871
                    Phone: 540/666-4932; Fax:542/666-4933:
                    Email:adminn@www.iwfa.com

6. The 2 inch (50mm) wide band around the perimeter shall be assessed by a similar procedure to
that in 3 and 4, but a small number of particles is considered acceptable where poor frame condition mitigates against the high quality standards normally achieved.

7. Edge gaps normally be 1/32-1/16 inch (1-4mm). This allows for the water used in installation to
be squeezed out. This ensures that film edges are not raised up by contact with the frame margin.
Contact with the frame margin could lead to peeling of the film.

8. For thicker safety films the edge gaps will normally be 1/32-1/16 inch (1-4mm), with 1/32-1/8 inch (1-5mm) being acceptable for films less than or equal to 7mil (175u). Combinations solar control
safety films will also fall within this standard. An edge gap of up to 1 / 16 inch (2mm) is
recommended, especially for darker (tinted, metallized and sputtered) films, to minimize the light
line around the edge of the installed film.

9. Splicing of films is necessary when larger panels of glass are treated, where both length and
width of the glass exceed the maximum width of the film. The splice line itself should not be
viewed as a defect. This line should be straight and parallel to one edge of the frame margin. The
two pieces of film may be butt jointed. The maximum gap at any point in the spice should be 1/64
inch (1mm). Film may be overlapped, spliced or butt jointed.

10. Certain films with special high performance coating may have lengthened cure times.
Consult the manufacturer for the cure times of these.

Table1 - Typical Cure Times

FILM THICKNESS       FILM THICKNESS   TYPICAL CURE IN MLS     IN MICRONS (U) TIME (DAYS)

Up to 4 Up to 100 30    4 to 8                   100 to 200       6        8 to 12      200 to 300 100

Over 12 but not Over 300 but not 140
More than 17 more than 425