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Security window film buying guide

Updated: 21 October 2026

You are choosing a first clear roll for a glazed door, a low pane, or a window someone can reach from the path, and amazon.co.uk mixes safety film, security film, and anti-shatter film in the titles. This security window film buying guide is the order to use first: the job of the sheet, the thickness, the adhesive, a width that covers the pane, the glass, and any test the seller names. Shelf prices sit on the [security window film comparison](/hub/door-and-window-security/security-window-film). Peter F. checked those listings against Glass and Glazing Federation and National Protective Security Authority notes, with no lab test. A qualifying purchase can earn a commission at no extra cost to you. This page was updated on 21 October 2026.

You are choosing a first clear roll for a glazed door, a low pane, or a window someone can reach from the path, and amazon.co.uk mixes safety film, security film, and anti-shatter film in the titles.

Our top picks

Buydecorativefilm BDF S4MC 4 mil

Best overall

Buydecorativefilm BDF S4MC 4 mil
8.6/10about £66.51
View offer
Mgood Mgood 4 mil, 30 cm

Rank 2

Mgood Mgood 4 mil, 30 cm
8.0/10about £11.59
View offer
Shackcom Shackcom 4 mil roll

Best value

Shackcom Shackcom 4 mil roll
7.6/10about £13.99
View offer
On this page
  1. 1.What you are buying
  2. 2.Thickness and what a test claim is worth
  3. 3.One piece, and a width that covers the pane
  4. 4.Adhesive film, and glass you should leave alone

What you are buying

The roll is a clear adhesive polyester sheet for the inside of the glass, there to hold fragments if the pane breaks, while the lock and the handle still do their own work. Listings call that sheet safety window film, security window film, or anti shatter window film. The Glass and Glazing Federation assigns safety film to a BS EN 12600 class and security film to BS EN 356 or BS EN 13541. A mil on the title is the seller’s thickness claim. A class is a certificate for that film on that glass. Take the checks in order: the job, then thickness with any certificate, then adhesive polyester, then one width for the pane, then the glass, then a named test in the seller’s words. A trade film of about 100 microns can carry a certificate to BS EN 12600 Class 2B2, and that certificate stays with the named film. The same 4 mil wording on an amazon.co.uk roll is that listing’s own claim. National Protective Security Authority notes are blast guidance, and a reason to ask for a current certificate.

Thickness and what a test claim is worth

About 100 microns is what sellers call 4 mil, and about 200 microns is what they call 8 mil. Glass and Glazing Federation thickness excludes the adhesive and the coatings, so two titles that both say 4 mil can be describing different layers. NPSA Class 2(B)2 film is at least 100 microns and certificated. About 175 microns is the NPSA figure for Class 1(B)1 when blast curtains are omitted, and that blast note leaves a household 8 mil roll as a household roll. The longer micron comparison is on 4 mil or 8 mil security window film. BDF S4MC is the listing in this set that states a test: ANSI Z97.1 Class B and CPSC Category 1. Those are United States safety-glazing tests, separate from BS EN 12600 and from BS EN 356. An EN 356 P class is a manual-attack test, and a film can be discussed for impact while remaining outside that class. A narrow 4 mil roll here is about £12, Qualsen’s 8 mil is about £19.98, and BDF is about £66.51, the wider roll that states the US tests. A current British Standard certificate for this film on your glass is absent from these listings.
Buydecorativefilm BDF S4MC 4 mil

Testsieger

Buydecorativefilm BDF S4MC 4 mil
8.6/10about £66.51
View offer

One piece, and a width that covers the pane

Daylight film covers the glass you can see and stops short of the frame. NPSA asks for one piece, a gap of about 1 to 3 mm, and a gap up to 5 mm only where the frame is irregular. A join is a weak line, so measure the visible pane, allow that margin, and buy a roll at least that wide. A door pane of 28 cm can sit in a 30 cm roll if you centre it and leave about 2 mm at each edge. A 50 cm pane needs a wider roll for that same single sheet. Widths in this set are 30 cm by 200 cm from Mgood, DARUITE, and Qualsen, about 44 cm by 200 cm from Mgood and DARUITE, Shackcom at 44 cm by 300 cm, AWKAQUN at about 76 cm by 5 m with no mil in the title, and BDF at 91 cm by 7.32 m. Shackcom’s material field says vinyl while the bullets say 4 mil film, so leave both lines on the row until the parcel matches one of them. Shackcom is the best value among the mid-price 4 mil rolls. A pane wider than the roll you will pay for leaves a join, and a join is the weaker sheet.

Adhesive film, and glass you should leave alone

The sheet that holds glass is adhesive polyester. Static cling grips by suction and peels off, which is the bathroom film. Mirror film and frosted film are privacy films. A review that praises blackout, a one-way view, or a UV block on a Mgood or DARUITE privacy listing belongs to that privacy product, even when the same brand also sells a clear roll. Read the clear listing for the word adhesive, because a static-cling title is a different buy even at the right width. Smooth float is the surface these rolls are sold for. Rough, frosted, wired, and cracked glass are a poor fit, and glass under about 3 mm can crack under the squeegee while you fit the sheet. Toughened glass stays toughened glass with film on it. NPSA does not recommend anti-shatter film on laminated glass, so an existing laminate is a reason to skip the roll. Approved Document Q applies to new dwellings, so buy a tested window when you need PAS 24 or that document. Which listing suits a small pane, a wider pane, or the roll that states the US tests is on best security window film.

Common questions

What should I check before I buy security window film?
Start with the job: a clear sheet to hold broken glass. Read about 100 microns for a 4 mil label and about 200 microns for 8 mil, plus a certificate for that film on that glass. Confirm adhesive polyester and one width for the pane. Film smooth float, and quote any test in the seller’s words. A mil on the title is the seller’s claim until that certificate names the film and the glass.
Is 4 mil the same as a British Standard?
Sellers use 4 mil for about 100 microns and 8 mil for about 200 microns. Glass and Glazing Federation thickness leaves out adhesive and coatings. NPSA Class 2(B)2 asks for at least 100 microns and a certificate together. The mil is the seller’s claim. A BS EN 12600 class is a certificate for a named film on named glass, and these listings do not show that certificate.
How wide does the roll need to be?
The roll should cover the visible glass in one piece and stop about 1 to 3 mm short of the frame. NPSA allows up to 5 mm only for an irregular frame, and a join is weaker. Widths here run from 30 cm by 200 cm to 91 cm by 7.32 m. A 28 cm door pane can take the 30 cm roll if you centre it and leave a small gap at each edge.
Is adhesive film different from static cling, mirror film, or frosted film?
Adhesive window film is polyester with a glue layer that bonds to smooth glass. Static cling grips by suction and peels off a bathroom pane. Mirror film and frosted film are for privacy. A blackout review on a Mgood or DARUITE privacy listing stays with that privacy film. Buy the clear listing that says adhesive.
Does a US safety test on one listing count as a UK pass?
BDF S4MC states ANSI Z97.1 Class B and CPSC Category 1. Those are United States safety-glazing tests, separate from BS EN 12600 and BS EN 356. Quote them as the listing states them. A UK class would be a certificate for this film on this glass, which these rolls do not show. The US line is why that roll is the top pick in the comparison, not a building-regulations pass.

Related pages

How to apply security window film

Security window film

4 mil or 8 mil security window film: microns and test

Best security window film for the pane you are covering

Security window film and burglary on a reachable window

Sources

Public UK sources for glazing and window security, last checked on 21 October 2026. Shelf prices, stars, and review counts are from the amazon.co.uk listings in this category on that date.

  1. Metropolitan Police: window security (retrieved 21 October 2026)
  2. Approved Document Q, 2015 (retrieved 21 October 2026)
  3. Approved Document K (retrieved 21 October 2026)
  4. GGF Datasheet 5.18.3: adhesive-backed polymeric film (retrieved 21 October 2026)
  5. GGF Datasheet 5.18.8: installation on existing glass (retrieved 21 October 2026)
  6. NPSA EBP 08/13: anti-shatter film (retrieved 21 October 2026)
  7. NPSA: security of domestic windows (retrieved 21 October 2026)
  8. EWFA technical paper on safety films (retrieved 21 October 2026)