Signal Protect - Clear Film

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Purchase in 5 foot increments (QTY 3 = 15 linear feet). Shipped in one continuous piece on a roll.
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Signal Protect - Clear RF Shielding Window Film 

Virtually Clear Radio Frequency Signal Protect Window Film

*Does Not Include Free Shipping*

EMF Shielding Window Film

Installation should not commence if glass temperature drops below 40 degrees Fahrenheit or 5 degrees Celsius.

Virtually Clear Radio Frequency Signal Protect Window Film - our most transparent RF window shielding / glass shielding to block a wide range of radio frequency and microwave radiation.

This product offers light transmission of 72%.

The ultimate protector that provides an unaltered view of the outdoors while keeping your home naturally cool, new, bright, and enhance its value.

Trusted by EMF Professionals throughout the globe.

Includes a 10 Year Warranty.


RF Shielding Window Film

Signal Protect Clear, formerly SLTWF1 is the key to high performance windows and keeps your building safe, new and cool.

This film is virtually undetectable on your windows but provides a Radio Frequency barrier as well as keeping your home cooler and more comfortable while protecting your décor.

Designed to block analogue and pulsed digital signals for external sources such as microwave transmitters, cell phone towers, neighbours cordless telephones and Wi-Fi signals.


  • Best light transmission 72 %
  • RF shielding performance 99.99 %
  • Low reflectivity maintains the original appearance of your glass
  • Not noticeable from the inside or outside
  • Provides security from breaking glass
  • Excellent solar heat control blocking 55 % of total solar energy
  • Lowers summer time cooling expenses
  • Blocks +99 % of Ultraviolet “UV” rays
  • Blocks +95 % of Infrared “IR” rays
  • Provides a partial deterrent to premature skin aging and some potential skin cancers
  • Provides privacy, RF Eavesdropping protection and IR Eavesdropping protection, and security for wireless networks
  • Suitable for Government Agencies
  • Application: Self adhesive, activated by water
  • 10 Year Warranty


Desired Amount of Window Film

Technical Data:

  • Sold per linear ft in 3, 4 or 5 ft widths @ 5 ft increments
  • Min Qty = 5 linear ft or (5 feet length X roll width) What is a Linear Foot?
  • Full Rolls are 100 ft long

Installation Weather Guidelines – Interior Film

The main concern with installing film at temperatures below freezing would be that any water left behind during installation would freeze and cause a visible defect in the film. Thus the best method for reducing any potential problems would be to take extra care to remove all excess water during installation. The only way that the water could potentially freeze would be if the temperature of the interior pane of glass dropped below 32 ̊F. Below are a few recommendations to look for when installing in cold temperatures.

As a general rule these guidelines would be recommended any time temperatures are expected to be under 10 ̊F for double pane glass or under 40 ̊F for single pane glass, within 72 hours of the installation period.

  1. Check the temperature of the interior pane of glass, with an understanding that the temperature of the glass will drop significantly at night. If the temperature of the interior pane is less than 40 ̊F do not install film.
  2. Spray the glass with film mounting solution if the mounting solution freezes do not install film.
  3. Use a temperature gun to determine the temperature of the frame of the window right next to the glass. Water left around the edges of the glass could freeze due to the frame
  4. Check to see if heating vents are directed at the glass and will hold that glass at a warmer temperature, often allowing film installation at significantly lower outside temperatures.
  5. Determine what temperature the building is kept at during the night. Often unoccupied spaces, or spaces being renovated will be kept at much lower temperature, as are some buildings that utilize temperature setbacks at night.

In general, there are very few days that would prohibit film installation in the US climate. The interior temperature of the building will typically hold the interior glass temperature above 32 ̊F. The above are situations to be aware of, as well as suggestions to minimize the risk of installing film in temperatures that are too low.

DISCLAIMER: When applying film on cars, always check with your local authorities on restrictions for your application in your area. This product is to be installed by an experienced, professional car window film installer. Installation should not commence if glass temperature drops below 40 degrees Fahrenheit or 5 degrees Celsius.

2 mil (8mil optional)
RF Power Attenuation @ 1 GHz:
-33 dB, 99.949 %
RF Power Attenuation @ 2 GHz:
-38 dB, 99.984 %
RF Power Attenuation @ 10 GHz:
-28 dB, 99.841 %
% IR Light Blocked:
% UV Light Blocked:
Total Solar Energy Rejected:
Visible Light - % Transmittance:
72 - High
Visible Light - % Reflectance Exterior:
9 - Low
Visible Light - % Reflectance Interior:
9 - Low
Available Widths:
3, 4 and 5 feet
Minimum Lengths:
5 Feet
Additional Length Increments:
5 Feet
1 m² = 10.76 ft²

14 Reviews

  • 4
    Worked well!

    Posted by Jake Berg on 24th Jun 2024

    This product was as advertised, easy to install, and the company was very responsive and assisted with a custom order in good time. It only reduced our RF exposure so I'm not sure if it's coming in through other areas but it definitely improved the magnetic radiation we were experiencing as well.

  • 5
    Installation & Clarity

    Posted by Chad on 19th Jul 2023

    Products installs very nicely and has very good optical clarity.

  • 5
    Signal Protect, clear film

    Posted by Jessica Bryan on 17th Jul 2023

    I purchased a small sample of Signal Protect and it worked so well that I am planning to purchase enough for a whole window.

  • 5
    Clear Film WOrks

    Posted by Unknown on 23rd Apr 2023

    Product works as advertised. Recommend a professional install! Be sure they use silicone on the edges to avoid oxidation.

  • 4
    very happy with it

    Posted by rachel on 14th Apr 2023

    it reduces EMF signals

  • 5
    Works really well

    Posted by Michael on 11th Apr 2023

    Took our room from 500-1000µW/m² range down to low 20µW/m², was very pleased.

  • 5
    Signal Protect - Clear Film

    Posted by Rémi Bérubé on 23rd Mar 2023

    I am thrilled with this product. I got my car hard. THANKS... Je sui enchanter par ce produit. J'ai fait bander mon auto. Merci...

  • 5
    Signal protect- Clear

    Posted by Tammy on 21st Dec 2022

    Product meet expectation

  • 5
    Engineering project

    Posted by Tammy on 30th Aug 2022

    good product

  • 5
    effective frequency attenuation

    Posted by Allan Wilson on 6th Nov 2021

    Shuts out the head noise with concrete walls and remote access and location features turned off. Freedom of thought and peace of mind is real.

  • 5
    great product!

    Posted by Betsy Leighton on 27th Sep 2021

    The film is so clear it is impossible to tell it is there, while doing the job of blocking EMFs. Love it!

  • 5
    Signal Protect - Clear Film

    Posted by Nancy Messinger on 23rd Jul 2021

    I really love this product and have used it on multiple projects. The film is essentially clear in that it is possible to see right through it but has an ever so slight greyish tint that looks good and natural and is hard to notice when installed. Working with SLT is always easy and their customer service is great. I really feel confident that SLT stands behind all their products.

  • 5
    Review Clear Signal Protect Film

    Posted by Sharon on 12th Jul 2021

    Excellent. Without taking a meter, we could feel the difference once this product was installed on the window. It is perfect for reducing the electromagnetic radiation hitting the windows on a regular basis.

  • 5
    SP window film - a DIY perspective

    Posted by Etta on 25th May 2021

    Ok, I am a novice, but I learned how to install SP window film and it looks pretty good (but not perfect)! I covered about 30 windows (~400 square feet) in a high-rise condo. If you can paint or wallpaper, you can learn to install window film. Major lessons learned: 1) window film outperforms curtains (i.e., needed 3-layers of fabric), 2) professional grade window squeegees are a big time saver, 3) two people are best for large windows, 4) there are several “finer points” to a successful installation – keep a list and review it often, and 5) I forgot that my condo has a killer view of the BC mountains (b/c the window blinds / curtains were always closed!). This was a very intimidating project, but I am very pleased with this product and would buy it again!!