Views: 0 Author: Site Editor Publish Time: 2026-05-29 Origin: Site
No, anti-burst film can not prevent the glass from breaking. This is a main distinction that we must clearly understood. This film's purpose is not to make the glass unbreakable, but is to control the consequences of breakage.
Anti-burst film's actual function is to hold the shattered glass together when the object collides, preventing dangerous fragmentation. The glass will still crack, spiderweb, or shatter when received enough force—whether from a burglar's hammer, a storm-driven
projectile, or an explosion's pressure wave. However, this broken glass fragment will not fly into the interior room as previously sharp one or leaving an immediate opening, but get close with the film, creating a coherent membrane that continues to provide a barrier.
A directly example can be explain for this distinction in real-world conditions from the aftermath of Typhoon Mangkhut (2018) illustrates. Hotels that had applied security filmto windows found that when the fragment broken in the wind, the fragmented glass still , "standing" in place,held by the film. This prevented rooms from being exposed to wind and rain and allowed repairs to be scheduled rather than performed as an emergency .
Safety film majority function is hold glass fragment in the original position when glass was broken caused sufficiently strong external force. The mechanism involves:
1.Tear-resistant polyester layers (typically 7 to 42 micro-layers) bonded with specialized pressure-sensitive adhesives
2.Adhesive anchoring that maintains bond between film and glass even after glass fracture
Tensile strength allowing the film to stretch under load without tearing — documented at 225 MPa (machine direction) for 42-layer micro-layered film.
The glass will broken when an impact or blast wave strikes the glass. However, anti-Burst film adheres to the cracked surface, keeping the fragments attached to the film rather than allow them to separate and become projectiles. The glass is broken, but it is still as a single, flexible membrane.
No applied film is able make normal glass unbreakable. The physics are straightforward: glass is a fragile material with limited fracture toughness. Once the stress on glass limited with breakage strength, breakage occurs. Anti-Burst Film can not change these basic material properties.
This film's function is to change the glass broken way. Glass will not become a hundred of independent fragments suddenly, the glass fails in a controlled manner—cracked but contained. According to NPSA guidance, properly applied anti-shatter film "approximately halves the stand-off range at which a hazard would occur from flying annealed glass shards" .
The U.S. General Services Administration (GSA) has established six Performance Conditions (PC) for blast-resistant glazing systems :
Performance Condition | Description | Achievable with Security Film? |
PC 1 | Glass does not break | No — not achieved with film on standard glass |
PC 2 | Glazing cracks but is retained by the frame; dusting near sill acceptable | Yes — typical for well-anchored film |
PC 3 | Glass cracks; fragments enter space but land within 3.3 feet of window | Yes |
PC 4 | Fragments land within 10 feet of window | Yes |
PC 5 | Fragments impact witness panel ≤10 feet from window at ≤2 feet height | Yes |
PC 6 | Catastrophic failure; fragments exceed PC 5 limits | Unacceptable performance |
The key observation:
1.In the standard commercial interlayer glass unit, no safety film has met Performance Condition 1 in which the glass does not break.
2.In GSA system, the highest achievable rating is PC 2—glass cracks but is retained.
Documented performance specifications for micro-layered security film include:
①GSA Rating "3A" (Very Low Hazard): Minimum blast load of 11 psi overpressure and 55 psi·ms impulse.
②GSA Rating "3B" (Low Hazard): Minimum blast load of 10 psi overpressure and 89 psi·ms impulse.
③ASTM F1642 Rating "Low Hazard": Minimum blast load of 4 psi overpressure and 28 psi·ms impulse.
These ratings represent the film's ability to protect glass fragments rather than the stress at glass broken. The glass will break at lower pressure, but this film can prevent glass fragments form becoming lethal projectiles.
Claim | True? | Explanation |
Prevents glass from breaking | × No | Glass breaks at same force threshold; film cannot alter glass fracture mechanics |
Holds broken glass together | √ Yes | Adhesive bonds fragments to film; glass remains as contained membrane |
Prevents flying glass shards | √ Yes (within limits) | Primary function; reduces projectile hazard by containing fragments |
Makes glass bulletproof | × No | Film is not designed or tested for ballistic resistance |
Works without frame attachment | ⚠️ Partially | Unattached film performs poorly under blast; attachment required for rated performance |
Lasts permanently | × No | Replacement required every 10-12 years |
Provides UV protection | √ Yes (if specified) | Many security films include 99%+ UV blocking |
Application Scenario | Primary Function | Documented Benefit |
High-rise buildings | Prevent glass from falling to ground level after spontaneous breakage | Reduce street-level hazard from tempered glass shards |
Schools & childcare facilities | Protect children from injury near glass doors and low windows | Reduces laceration risk from accidental impacts |
Hurricane-prone regions | Maintain building envelope after debris impact | Prevents secondary injury to occupants |
Interior glass partitions | Contain shards from office or lobby breakage | Prevents secondary injury to occupants |
Q: If Anti-Burst film doesn't prevent breakage, what is the point of installing it?
A：The key is prevent injury. Most injuries from glass fragment are caused by flying shards rather than glass original break. Anti-Burst film is able to limit this fragment within a certain range. In blast events, this is the different between lethal fragmentation and a cracked-but-intact window panel. The UK NPSA specifically endorses anti-shatter film for this purpose.
Q: Can Anti-Burst film protect my windows during a hurricane?
A: Yes, but with an important qualification. Security film combined with impact protection attachment systems has passed missile impact testing (Medium Missile "C" and Small Missile "A") followed by pressure cycling per ASTM E1996/E1886 . However, the film does not prevent the glass from breaking when struck by debris — it retains the broken glass, preventing wind and rain from entering the building. The attachment system is essential for this application.
Q: Will security film affect how my windows look?
A: Quality security film is optically clear and virtually invisible when professionally installed. One manufacturer notes that "viewing the film from a distance of ten feet at angles up to 45 degrees from either side of the glass, the film itself shall not appear distorted" . Tinted or reflective options are available if solar control is desired.
