Strata 20 is a silver mirror window film for the inside of the glass. It holds back the sun and the solar heat and gives one-way vision privacy in daylight.

Applications

On ground-floor windows
On windows of private houses
On glass panels of entrance doors

Precisely Tailored for a Perfect Fit

Provide your window dimensions (e.g., 24 16/32" × 33 16/32"), and we cut the film to size, ready for installation — with no offcuts to pay for.

Complimentary Installation Accessories

Every order includes a free 3M squeegee or full toolkit, plus the mounting solution concentrate, and a free piece of film to practise the technique on. Learn more in our window film for sale section.

Available Widths

Strata 20% – 20-inch width — the narrow roll, for single windows and door panels.
Strata 20% – 30-inch width — the middle width.
Strata 20% – 40-inch width — the widest, for large panes with fewer seams.

Performance and Benefits

Strata 20 transmits 23% of the visible light (VLT 23%) and rejects 84% of the total solar energy (TSER 84%) — the strongest heat rejection of the silver mirror films we cut. It blocks 99% of UV radiation, which is what slows the fading of furniture and flooring. See more in our sun protection window films section.

One-Way Vision and What It Depends On

The mirror effect works towards the brighter side: from outside the glass reads as a mirror while it is lighter outdoors than in, and you keep the view out. At night this reverses — with the light on indoors and darkness outside, the room becomes visible from the street. That is how every mirror film behaves, and it is worth knowing before you order.

Adaptable for All Windows

Suitable for large or small windows. At VLT 23% this is the standard level of darkening, not a dark film — but on a small pane the room will still feel noticeably dimmer. The silver hue gives a slightly bluish cast to the light coming in, and the view out stays undistorted.

Alternative Light-Toned Films

For more natural light there are lighter models: Strata 35% at VLT 36% and TSER 67%, Bronze Ex 35 at VLT 36% and TSER 75%, or Gold L40. Learn more about mirror privacy window films.

Technical Specifications

Privacy: one-way visibility in daylight
Light transmission, VLT: 23%
Total solar energy rejected, TSER: 84%
UV protection: blocks 99% of UV radiation
Protective coating: 2H hardness
Structure: two-ply
Service life: 9 years and more
Installation: interior — for the outside of the glass see Strata EX 20

Key Features

Works on all smooth glass surfaces.
For double glazing and other complex glass, choose the exterior Strata EX 20 instead — an exterior film stops the energy before the glass, so the pane does not absorb the heat.