Burglar-resistant frames are no longer a simple option, but a targeted investment in our security, combining technology, materials, and proper design. The need for substantial protection of homes and business premises has led to significant developments in the field of frames. The security of frames (security of aluminum frames) is measured by resistance classes WK (Widerstand Klasse).
- WK 1 Category: The first category refers to the effort required to open a window using body force, e.g., by kicking, lifting, pulling, or falling onto it. Only frames with basic glazing are classified in this category, and the burglar does not need to be particularly skilled.
- WK 2 Category: In this category, the opportunistic perpetrator uses simple tools, such as screwdrivers, pliers, wedges, etc., to force open the locked frame.
- WK 3 Category: In this category, the opportunistic perpetrator uses additional small tools, such as a second screwdriver, crowbar, or pry bar, to open the door or window.
- WK 4 Category: In this category, the experienced perpetrator uses tools such as a sledgehammer, saw, hammer, chisel, or cordless drill.
- WK 5 Category: The experienced perpetrator in this category additionally uses power tools, such as a drill, saw, or jigsaw, and an angle grinder with a maximum disc diameter of 125 mm.
- WK 6 Category: (the highest category) the experienced perpetrator uses an angle grinder with a maximum disc diameter of 250 mm or other additional reinforced power tools.
What do ‘burglar-resistant frames’ mean in practice?
When we refer to burglar-resistant frames, we are talking about aluminum systems that have been manufactured with the aim of making any attempt at forced entry substantially difficult.
Burglar-resistant frames are not based on a single element, but on the cooperation of many factors:
• durable aluminum profile construction
• advanced locking systems – mechanisms
• glazing of increased resistance, even against weapons
• proper application during installation
• Extra protection with systems such as folding grilles, removable bars, iron bars, etc.
In practice, the goal is to significantly delay and deter the burglar from entering our premises.
Aluminum Profiles and Locking Mechanisms for Burglar-Proof Frames
Aluminum Profiles
The profile constitutes the main body of the frame and directly affects its overall behavior. A secure aluminum frame combines:
• greater thickness and reinforced cross-section
• resistance to heavy glazing weights
• increased rigidity against pressure
• better cooperation with locking systems and hinge resistance to heavy glass (150 kg/m2)
Burglar-resistant aluminum profiles for aluminum frames are specific energy-efficient aluminum frames that can withstand increased glass weights and increased pressures.
A quality profile maintains its stability even under intense stress, which is crucial in cases of forced entry.
Mechanisms and Locking Points
Equally important to the security provided by a frame are the frame mechanisms and the locks it features. In addition to having multiple locks, a burglar-resistant window must also withstand the increased weight of the glass.
Hinged burglar-proof frames
• Perimeter locking mechanism
• uniform pressure distribution on the sash
• increased resistance to burglar tools
• Special mechanisms and hinges for the heavy weights of burglar-resistant glass
Sliding frames
• Multiple security locking in sliding frames for higher security (three or six-point locks)
• limitation of the possibility of lifting the sash with special mechanisms
The quality of the mechanisms plays a decisive role, especially in sliding systems where most weaknesses are found regarding security aspects.
Frame Glazing
Burglar-resistant glazing plays a very important role in burglar-proof frames, as it is the most exposed point.
Triplex (laminated)
Triplex (laminated) glazing is created by joining two or more sheets of glass, which are bonded together using special PVB films, under conditions of high temperature and pressure. This results in a single and durable sheet of glass.
In case of breakage, the intermediate PVB film holds the pieces of glass in place, preventing disintegration and the creation of dangerous fragments. The broken glass remains united, forming a characteristic spiderweb-like pattern. At the same time, this film also contributes significantly to improving sound insulation.
The main characteristics of Triplex glazing are the following:
• consists of more than one sheet
• features an intermediate retention film
• remains in place even when broken
Securit (thermally treated)
Securit glazing: Securit glass is safety glass that, through special processing, becomes more resistant to impacts and thermal stresses. When it breaks, it shatters into small, relatively harmless pieces instead of sharp fragments.
The main characteristics of Securit Glazing are the following:
• greater resistance than ordinary glass
• breaks into small, almost harmless pieces
• limited anti-theft action compared to triplex
Bulletproof glass – Burglar-proof glass
Bulletproof glazing is a special category of glass, manufactured for high-security areas such as banks, museums, jewelry stores, etc. It is constructed with three or more layers of glass (many joined panes – many layers – laminated) of different thicknesses, between which a special film is inserted, in order to meet the required level of security.
Bulletproof glass is categorized according to the weapon, its caliber, the bullet’s speed, and the number of shots (see more details in frame security).
Burglar-resistant Exterior Shutters (roller shutters or traditional shutters)
Exterior shutters act as an additional barrier for aspiring burglars, significantly enhancing burglar-resistant frames.
Burglar-resistant roller shutters
Heavy-duty roller shutters (see all types of heavy-duty roller shutters) with security pins substantially contribute to the reinforcement of frames, offering increased protection against attempted forced entry. The pins act as fixed security points that keep the roller shutter ‘tied’ in place, significantly hindering any attempt to lift or force entry. At the same time, their more durable construction makes them particularly resistant to mechanical stresses, creating a reliable barrier that increases the required time for forced entry and acts as a deterrent for burglars.
• prevent lifting from the outside
• create a strong mechanical barrier
• ideal for ground floor openings
Roller shutters with reinforced guides – wing
For maximum protection of your space, roller shutters with reinforced guides – wing are the ideal solution, as they reinforce the roller shutter’s movement points. Their design prevents the system from ‘unhooking’ from the frame, even in cases of intense stress or attempted forced entry. Essentially, this additional support eliminates the room for maneuver for aspiring intruders, making the frame extremely robust and secure. The main characteristics of roller shutters with a guide-wing are the following:
• hold the sash within the guides
• reduce the possibility of derailment
• increase the overall strength of the system
Burglar-resistant shutters
The contribution of aluminum shutters to burglar-resistant frames largely depends on their construction method and their slats – louvers (see all louvers from aluminum shutters). How maximum security is ensured with aluminum shutters.
• Multiple locking points on each sash separately.
• Internal screwing of hinges (maskoula) for protection against external forced entry.
• Use of closed panels that make the sashes more robust.
• Unified frame (glass-shutter), which has an advantage over frames with separate casings.
• Selection of hinged systems, as they are considered more compact architectural systems compared to sliding ones.
Removable bars in burglar-resistant frames
Removable security bars are an ideal choice for someone seeking security without visually imprisoning their space with permanent structures. This specific system has the following characteristics:
• The bars lock into special receptacles only when necessary, such as during evening hours or when you are away, and are removed with a simple motion
• They do not permanently affect aesthetics as they are easily removed, allowing you to enjoy an unobstructed view and natural light.
Shutters with integrated grilles
The protection of your home or business premises reaches another level. Now, every aluminum frame, whether it’s a window or a balcony door, can be reinforced with folding security grilles, which work perfectly with your roller shutters or traditional shutters. (see photos of shutters with grilles)
The main characteristics of shutters with integrated grilles are the following:
• Combine functionality and protection
• Provide double security
• Maintain a balance between aesthetics and reinforcement
• Impenetrable Lock: We use a recessed security mechanism in the bolt. This design protects the cylinder from extrusion or impacts, making forced entry practically impossible.
• Maximum Anti-Corrosion Protection: Assembly is done exclusively with screws and rivets. The absence of welds eliminates corrosion points, offering double the lifespan and robustness.
• They are practical to use
• Open when protection is not required
• Offer strong security, deterring to the maximum extent anyone who tries to break in
• Retract almost silently into their special rails when the space needs light and an unobstructed view
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