Bullet resistant glass and use thereof

The invention is in the field of bullet-resistant glazing materials that prevent the passage of projectiles of different types of weapons. In particular, the invention relates to a bullet-resistant glazing, the B4 according to draft ÖNORM EN 1063 withstands the attack stresses the class of April 1993, where handguns caliber 44 Magnum with a tombak FMJ bullet / Flathead projectile / soft core lead with steel penetrator (type SS 109) with a mass of 15.6 ± 0.1 g of a firing distance of 5.00 m and an impact speed of 440 ± 10 m / s is not of a functional failure in three goals, which are at a distance of 120 ± 10 mm, bullet-resistant glazing lead.

Interleaf resistant glazing are nowadays already used, especially in areas of financial institution to such a hand, the undisturbed observing all operations both within the cash outside the box office, as to allow even from outside to inside the office, on the other hand the over money giving enacting cashier the required security.

Furthermore, such shot-inhibiting devices are also known in other public institutions, and it is finally possible that such devices be installed in remote homes or the like as a window, thereby protecting the owner against break-ins and robberies.

For a long time were used to produce bullet-retardant glazing glass panes of inorganic mineral glass, the known constructions in principle of several interconnected or closely abutting discs passed that, to achieve the required bullet resistance, had to have a considerable thickness and thus a considerable weight. This led in many cases to construction difficulties, as substructures, which should bear the bullet-retardant discs had to be correspondingly large dimensions.

For this reason, contact recently increased glazing with bullet-inhibiting action by which consist of transparent plastic materials. Here, sheets of polymethyl methacrylate (PMMA), so-called acrylic glass, preferably, as this material has the advantage of having only a specific gravity of 1.18, so that it therefore is only about half as much as normal window glass or safety glass. However, when using only discs, for example, made of acrylic glass, to achieve the required bullet resistance to take a strength of acrylic glass in purchase, which is bothersome to many areas.

From DE 24 24 255 bullet-resistant glazing pane with a have become known comprising a plurality of adjoining or interconnected translucent discs, which are a arranged a combination on the bombardment vulnerable side of the glazing, consisting of polymethacrylate (acrylic glass) to its rear arranged polycarbonate window is. Derlei combinations of acrylic glass and polycarbonate panes, wherein the polycarbonate disc having a substantially smaller thickness than the acrylic glass panel should lead to an overall much thinner version of bullet-resistant glass, as this would allow full implementation in acrylic glass. Further, described in DE 24 24 255 that the acrylic glass must be placed at the bombardment vulnerable side of the bullet-resistant glazing to allow for a possible bombardment, the ball must first penetrate the acrylic glass to be then collected probably by elastic polycarbonate disc, which they has already issued its initial energy in the acrylic glass.

Although known from DE 24 24 255 combination already represents a significant improvement over the use of several together loosely or tightly linked acrylic panels, the resulting disc assemblies of glass are still relatively thick, if the glazing to withstand bombardment classes that massive attack stresses the have content. So it can be assumed that handguns that have a Magnum-caliber and fired from short distances, impact velocities show that, lead to failure of the bullet-resistant glass, as they are described in DE 24 24 255th

FR 2,634,417 discloses ballistic and explosion resistant glazing consists of four components, which are combined together to form a laminated glass. Facing the bombardment endangered wing found initially a relatively thick disc of mineral silicate glass, which is followed by a polycarbonate disc, which is bonded to the glass display panel by means of an approximately 5 mm thick resin layer of an elastomer based on silicone. Finally, on the back of a PMMA disk is arranged, which is in turn connected to the polycarbonate lens by using the same adhesive as is used for the intermediate layer between mineral glass and polycarbonate glass. The four layers mentioned is essential layers, the glass display panel is performed compared to the plastic discs of polycarbonate and PMMA such thick that the construction shown has no significant weight savings over existing solely of mineral glass bullet-resistant glazing.

Bullet-resistant transparent elements include also the US to remove 4,594,290. Herein, an element is described which has transparent panes of acrylic glass and polycarbonate, which are connected together by a transparent polyurethane adhesive. In further development of the known from US 4,594,290 object WO discloses 93/16872 elements with unidirectional bullet resistance characteristic, in which the acrylic glass have a thickness of 7.5 to 9mm and the rear connection polycarbonate element a thickness of 9.5 to 11mm, wherein these elements are also bonded together by a transparent polyurethane material. The thickness of the adhesive layer is about 2 mm, a corresponding build an Uzi 9 mm FMG (Full Metal Jacket) -Geschoß resists. Although according to WO 93/16872 can be realized, a relatively thin overall construction of about 20 mm, resulting in a very low weight of the bullet-proof glass, it can be assumed that by the Prüfgeschoß an Uzi 9 mm FMG caused energies considerably less resistance class are assigned than the class B4 according draft ÖNORM EN provides 1063rd So the energy of the projectiles of UZZI submachine gun only 1/3 of the Magnum is 44-storeys, which is why the UZZI is classified as B II.

The US 5,318,853 relates to bullet-resistant and resisting glass plastic laminates for security applications. Typically the laminates according to US 5,318,853 made of glass and plastic panes, for. Example of polycarbonate, which are bonded together with an adhesive agent based on a solvent-free alkyd resin. Again, it is assumed that the energy absorption must take place essentially in the relatively thick mineral glass lens, so that pretty heavy laminated glass results with shot-inhibiting effect due to the proposed structure.

Given the stated and discussed herein prior art it is therefore an object of the invention to provide a bullet-resistant glazing is available, which is also very high-energy projectiles, such as those described in the bombardment class B4 resists, both the penetration of the glazing by the projectile as well as the formation of chips are to be avoided and wherein at the same time should result on lightweight and thin design of the glazing, so that their applications are greatly increased. Moreover, handling of the discs as well as their processing and production should be facilitated. In addition, should also be particularly versatile bullet-resistant glazing according to the invention, which in favorable cases of a to be used in the invention glazing using the class B4 additional requirements, such as the example in grades B5 to B7 or partially in classes SG1 and SG2 ÖNORM EN 1063 of 1 June 1993 (draft) describes can be met.

These objects and further not in detail herein literally reproduced tasks with a bullet-resistant glazing according to the type mentioned above having the features of the characterizing portion of claim 1. Advantageous embodiments of the bullet-resistant glazing according to the invention are placed in the back to claim 1 subordinate claims. With regard to the use of claim 10 provides is a solution of the objects underlying the invention.

Because at a bullet-resistant glazing from a combination of two or more adjoining or interconnected translucent panes facing away with at least one acrylic glass and the bullet endangered wing back sliver-retaining lens made of polycarbonate, the combination of at least one non-outer monolayer or multilayer plastic film having base of PVC, PC and / or PET materials with a thickness between 20 and 500 microns, wherein said film is fixed adhesive or by bonding between the discs, it is possible to not have been readily foreseen or from the prior art derivable Wise,<ul><li>to reduce the thickness of the combination,</li><li>to achieve a significant weight saving,</li><li>full transparency and light transmittance of Verglasungskomoination to ensure</li><li>To avoid penetration through B4 class projectiles sure </li><li>avoiding any penetration even through B7-class missiles largely,</li><li>in any case exclude the disposal of chips on the back,</li><li>allow for thermal deformability of the combination,</li><li>In a preferred embodiment to provide a scratch-resistant wing and</li><li>also in a preferred embodiment, to achieve the destruction of the entire glazing due to stress, such as impact, shock or blow, by an additional splitter bond within the bullet-resistant glazing inventive combination.</li></ul>

The inventive bullet-resistant glazing does have in common with the prior art that a suitable for binding splinters polycarbonate lens is located at the rear of the glazing, which with rear glazing that the bombardment endangered wing remote outermost side of the bullet-resistant glazing is the invention meant a substantial difference over the known from the prior art by shot-retardant glazing, however, is that, once in place of polyurethane adhesives or the like, for example, known to be used that have a relatively large thickness of about 2 mm in the invention or multilayer plastic sheets of relatively low thickness are used. For the purposes of the invention, said mono- or multi-layer resin are respectively disposed in the interior of a bullet-resistant glazing combination, ie, they form in any case a final layer on the back or on the wing. Here, the herein can further achieve different materials above advantageous properties, surprisingly, by combination of at least three discs, films or sheets. In this connection, it was particularly surprising that, arranged by the combination on the fire endangered side, consisting of PMMA (acrylic) plate, a thin, approximately 20 to 500 microns, preferably 50 to 300 microns, thick sheet, which is fixed on the acrylic glass sheet is, and a lens made of polycarbonate, which joins the back of the film, can achieve a very simple and especially easy to manufacture building a bullet-resistant glazing combination which enormous attack stresses resists, and while still over the acrylic panels or combinations of previously known a significantly thinner design is also possible, so that in this way a significant Gewichtsersparung is possible.

Over prior art combinations of acrylic glass and polycarbonate panes, which are bonded to polyurethane resins, It is especially the one used according to an embodiment of the invention very simple or multilayer plastic film made significantly thinner (20 to 500 microns, compared with about 2 mm of the prior art ), which still results in a better shot-inflammatory effect.

It is particularly emphasized that compared to the previously belonging to the prior art bullet-resistant sheets by the inventive combination of very simple a very light, fully transparent and fully transparent pane is created, which is the design new possibilities and the use of these discs in wide ranges allows that could not be fitted with bullet-resistant safety glass so far for cost reasons. Another advantage of the invention is that the composite according to the invention can be thermally deformed, so that even certain bending radii can be achieved. Furthermore, it is possible to color composites of the invention (eg, acrylic glass), so that even visually attractive design options are available.

When used in the context of the invention, plastic is mono- or multi-layer films based on polyvinyl chloride (PVC), polycarbonate (PC) and / or polyethylene terephthalate materials (PET). Insofar as PVC or polycarbonate, are used as the film material are single-layer plastic films are preferred, with their transparency is generally slightly lower than that of the polyethylene terephthalate materials. Unless multi-layer plastic films are used, are those based on PET preferred. It is especially advantageous four-layer Polyterephthalsäureethandiolester film, which has a 100% color fastness, excellent transparency and an extremely small reduction of visible light to only 6%. The thickness of such a film is preferably 100-200 microns, very convenient are 125-180 microns.

The used according to the invention sheets of polycarbonate or acrylic glass are known to the expert and are obtainable by known methods.

In a first embodiment of the invention, the bullet-resistant glazing is characterized in that the discs and films are close to each other and are fixed to a frame. Accordingly, it is to be regarded as more than adequate to achieve the beneficial effects of the invention, tightly arranging the disc and film materials which are to be used for the realization of the construction according to the invention in the order in which it should be ensured, that a polycarbonate disc is always to be arranged as a terminating or rear window. It is advantageous to firmly connect the densely arranged lying disks together by a frame structure (for example, an adhesive tape or by adhesive).

In another preferred embodiment, there is the possibility that the polycarbonate pane is connected to the formation of an intimate and dense bond of the discs and of the film with each other with the film, for example by gluing or other chemical methods.

In any case, the involved in the construction of a bullet-resistant glazing of the invention single- or multilayer plastic film at least on one side connected by adhesive or flexible joints with the plastic disks involved in the construction. This one-way connection is used for fixing the relatively thin film before the actual assembly of the constituent of the bullet-resistant glazing according to the invention discs and films. It is particularly expedient if the slide or slides is fixed on the inner side in the combination of an acrylic glass pane by gluing. The back side of the film which faces away from the acrylic glass sheet may then optionally, as already mentioned herein, are permanently connected by bonding with the polycarbonate disc.

Although the thicknesses of the synthetic glass panes involved in the structure of the invention can be varied over a wide range, with the thicknesses can be oriented to the desired fire resistance and resistance to specific attack stresses, among other things, it has proved to be very useful to the interleaf of a B4-class projectile to prevent, when an acrylic glass panel at the construction according to the invention is involved, or if more acrylic glass panes are combined together, when the total thickness of the acrylic glass panels involved in the structure is about&gt; 20 mm. This total thickness results very effective for absorption of most of the information transmitted by the bullet on the bullet-resistant glazing energy.

Although a fairly good shot-inhibiting effect is also available with total thicknesses of acrylic glass significantly below 20 mm achievable, but it is in this case usually take precautions to ensure that the thickness of the other layers of the structure according to the invention is increased to provide enough material for a necessary energy absorption of to make bullets available.

In a further preferred embodiment, the bullet-resistant glazing according to the invention is characterized in that one or more polycarbonate lenses are included in the combination, one of which forms the back, where the total thickness of the polycarbonate lens is ≥ 5 mm. In conjunction with the total thickness of the acrylic sheet (s) of&gt; 20 mm, the invention therefore provides that the polycarbonate lens has a much lower intensity than the acrylic glass, with this much lower intensity in connection with the rear assembly of at least one polycarbonate lens sufficiently to be completely has proven for the prevention outgoing splitter.

In this connection, the polycarbonate disc, which is essential as the rear side of the glazing according to the invention in question, namely be made thinner than 5 mm, when another polycarbonate disc is provided in the composite of the invention and the total thickness of the polycarbonate discs of at least 5 mm, it is, however, at far preferable to form the closure plate to the back of the glazing according to the invention in a thickness of about 5 mm or more. It has in fact been found in the inventive arrangement that just preventing the release of possible splinters beikommt great importance, so that here existing safety potential possibly should not be abandoned in favor of a further weight saving.

Regarding the use of single or multi-security films will also be noted that, although single-layer films are suitable, it is preferred for the absorption of vacant projectile energy far when multilayer films or multiple layer or multilayer films are used. Therefore, it is within the scope of the invention is particularly advantageous when the total number of all layers of the mono- or multi-layer films, which are included in the structure according to the invention, ≥ 4. This requirement is met excellent example by the above mentioned herein preferred four-layer film.

In a further preferred embodiment, the or one of the acrylic glass panels embedded monofilament threads on from another plastic material. Plastic panes of acrylic glass with embedded synthetic threads of another material are known per se. The internal plastics filaments, tapes, grids or nets are made of a plastic material than it has preferably a high shear stability as well as a higher viscosity surrounding matrix plastic (acrylic). Examples of the plastic materials which are eligible for the inner plastic threads in question are in particular crystalline polyamides. Such disc elements with internal plastics filaments made of crystalline polyamide are prepared either by a discontinuous casting process or by continuous coextrusion of two incompatible thermoplastics. The embedded inside the plastic disk of the composite plastic threads may be arranged such that they run parallel to one another in only one direction, or so that they extend parallel to each other in two directions. In the latter case, the two directions may form an angle of 90 ° or an angle deviating from 90 °. If plastic strips are embedded, they are expediently arranged so that they are parallel to each other in only one direction.

Finally, it is possible that internal plastics threads also contrasting or different color to color in order elicit specific effects.

The embedding of synthetic threads in one of the acrylic glass panes or the acrylic glass has the advantage that the resulting optical impression and signals that here the safety aspect is especially emphasized a certain solidity of bullet-resistant glazing. In particular, it is advantageous that stuck in damages compact type, for example, the use of force by impact or other forms of destruction, resulting individual fragments of the acrylic glass panes to the inner threads or strips of preferably polyamide, resulting in complete destruction of the bullet-resistant glazing is prevented according to the invention. Thus, a burglar alarm with the bullet-resistant glazing according to the invention is possible. This is only possible, and more preferably by the integrated splitter binding and not binding back splitter having a polycarbonate lens, because the latter only the back release of fragments, such as occurs during bombardment avoids.

The bullet-resistant glazing according to the invention is in an advantageous embodiment, exclusively made of plastic materials.

On the other hand, under certain circumstances, the combination with sheets of inorganic mineral glass possible. Unlike the glass known from the prior art mineral glass panes are used in connection with the invention only in a very small thickness and preferably on the bombardment vulnerable poor defending. Mineral glass in a thickness of about 0.5 to 3 mm, which are used as a front panel in the bullet-resistant glazing assembly according to the invention, in particular, ensure a scratch-resistant design and therefore a longer life of potentially hazardous side. The use of stronger mineral glass sheets than 3 mm is not preferred in the context of the invention, as this leads to a considerable adverse influence on the total weight of the construction according to the invention.

There are also other variations from the basic construction of the bullet-resistant glazing according to the invention possible. So it is still possible to provide the bullet-resistant glazing according to the invention with a heat-reflective film coating. This combined or alternatively possible is the use of imbedded wires for example integrated into the synthetic glass panes, wherein the embedded wires may serve to form an integrated alarm system. Finally, a composite of the type described herein is alternatively possible to scratch-resistant equipment using mineral glass, which is additionally coated with a scratch-resistant film.

The invention also provides the use of a bullet-resistant glazing, as described herein, in order to reduce the passage of projectiles of conventional weapons and ammunition types such that a polycarbonate lens of the bombardment vulnerable side facing away. As mentioned herein, thus, the bullet-resistant glazing are used in accordance with its unidirectional bullet-retardant character especially as bullet-resistant glazing in the area of ​​financial institution for personal protection. In addition, the use of such inventive constructions in remote homes or as a panel is especially useful in connection with integrated alarm systems, but independent of the unidirectional bombardment hard character, possible to protect such holders against break-ins and robberies. Thus, an effective anti-theft with the bullet-resistant glazing according to the present invention is given.

In the following the invention with reference to the accompanying figures and in greater detail, examples will be explained.

The figures show:<dl id="dl0001" compact="compact"><dt>Fig. 1</dt><dd>the perspective view of a first embodiment according to the invention in exploded view;</dd><dt>FIG. 2</dt><dd>a perspective view of another embodiment according to the invention in exploded view;</dd><dt>Fig. 3</dt><dd>a perspective view of another embodiment of the invention with integrated splitter assurance in exploded view;</dd><dt>Fig. 4</dt><dd>in a perspective view an illustration of another embodiment of the invention;</dd><dt>Fig. 5</dt><dd>a perspective view of an exploded view of yet another embodiment according to the invention with integrated shatterproofing;</dd><dt>Fig. 6</dt><dd>a perspective view of yet another embodiment according to the invention with integrated binding splinters in exploded view;</dd><dt>Fig. 7</dt><dd>an embodiment not according to the invention in perspective view;</dd><dt>Fig. 8</dt><dd>also an embodiment not according to the invention in perspective view;</dd><dt>Fig. 9</dt><dd>the exploded perspective view of another embodiment not according to the invention and</dd><dt>Fig. 10</dt><dd>yet another embodiment not according to the invention in perspective view and exploded view.</dd></dl>

In Fig. 1, reference numeral 1 is a bullet-resistant glazing according to the invention. This comprises three components in combination. 6 stands for a 25 mm-thick acrylic glass. 2 represents a 175 μ-thick plastic film from Polyterephthalsäureethandiolester while 5 represents a 5 mm-thick polycarbonate disc. The disc elements and foil are arranged close together, where this can be done by gluing or a frame not shown. The home side, ie the bombardment vulnerable side is shown in FIG. 1 indicated by A, while the back is designated by R. The structure shown resists fire in accordance with the classification of ÖNORM EN 1063 bombardment class B4.

Fig. 2 shows a first modification of the structure according to the invention, as shown in FIG. 1. The designated in FIG. 1 with 6 25 mm PMMA sheet is replaced in the embodiment of FIG. 2 by two acrylic glass panes 4 and 7. The disc 4 has in the embodiment shown here has a thickness of 12 mm, while the disc 7 has a thickness of 15 mm. The film 2 can be selectively fixed on the disc 4 or the disc 7, after which the whole assembly can be joined together either by gluing or by fixing in a frame on.

In the embodiment shown in Fig. 3, the disc 7 is replaced by an acrylic glass plate 3, which embedded plastics filaments 3a having, for example polyamide. These contribute as integrated elements for sliver retention under stress.

The embodiment of FIG. 4 illustrates that the inventive structure also several films 2 may be involved. These can be formed the same or different. Specifically, a first film 2 facing the not the bombardment vulnerable side side of the acrylic glass pane 7 can be fixed while a second sheet 2 can be fixed to the bombardment vulnerable side facing side of the acrylic glass pane. 4 In any case, does not form the foils 2 a completion of the bullet-resistant glazing according to the invention from.

FIG. 5 again shows a modification of the structure shown in Fig. 4, in which an acrylic glass pane 7 is also replaced by an acrylic glass plate 3 with integrated binding splinters in the form of polyamide filaments 3a. Otherwise, the structure, as can be seen in Fig. 5, the indicated in Fig. 4 structure is comparable.

Yet another variation of the invention is shown in Fig. 6. The structure corresponds to the first construction shown in Fig. 5, but equipped on the end side of the splitter with integrated bond (3, 3a) acrylic glass pane 3, an inorganic mineral glass sheet 13 is laminated by means of a further film 2. The film 2 is preferably fixed on the relevant page of the acrylic glass pane 3 and bonded to the glass display panel 13 by suitable adhesive.

Each of the embodiment shown in Figures 1 to 6 can withstand the attack stresses of class B4 according Draft ÖNORM EN 1063rd

For comparison, in the 7 to 10 embodiments are shown which do not belong to the invention and do not meet these ÖNORM respect to action stresses the class B4. among others This includes the embodiment of FIG. 7, which consists only of a 20 mm acrylic glass plate. This also in Fig. 8 represented modification in which a 30 mm acrylic glass plate is designated 12.

Fig. 9 illustrates a structure which consists of 12 mm-PMMA (reference numeral 4), a 5 mm polycarbonate plate 5, a 10 mm PMMA sheet 9 and a 2-mm polycarbonate sheet 10 consists. Although in terms of thickness or overall thickness of the PMMA and polycarbonate lenses, the minimum requirements, such as those resulting for the invention was building, are met, the energy consumption is too low due to the lack of a foil layer 2, so that the structure shown in FIG. 9 in the bombardment test in accordance with the class B4 failed.

The same applies to the construction of FIG. 10, which includes a 12 mm acrylic glass, a 3 mm polycarbonate disc 8, a 10 mm PMMA sheet 9 and 5 mm polycarbonate lens 5. Again, the attack stress Class B4 according Draft ÖNORM EN 1063 is not met due to the absence of the film. 2

The production of a composite system of the invention will be described, as shown in FIG. 4

example 1

The system consists of a 15 mm Gußglasplatte, a polyethylene terephthalate film laminated thereon, continues a 12 mm PMMA Gußglasplatte, which was also covered with a polyethylene terephthalate film, the conclusion of the assembly forms a 5 mm polycarbonate plate.

The preparation of this composite system is divided into three steps:<dl id="dl0002"><dt>Part Step 1:</dt><dd>Cutting of all PMMA / and polycarbonate sheets. Depending on requirements, the corresponding formats are tailored for a composite system. To this end, all commercially available and known in the literature sawing tools for PMMA and polycarbonate are suitable.</dd><dt>Part Step 2:</dt><dd>Lamination of the polyethylene terephthalate film on the PMMA plates. Before the polyethylene film is applied to the PMMA sheet, an appropriate wetting and activating agent is brought to the film on the PMMA sheet, then by means of pressure rollers bubbles, the PET film and laminated without creases.</dd><dt>Part Step 3:</dt><dd>Bundling Using a 4 cm wide, fabric-reinforced tape of the plate composite (three pieces) is fixed along the edge. The composite system thus obtained can then be fitted into corresponding metal frame and is thus usable form.</dd></dl>

The glass prepared in Example were examined as follows:

The shot-inflammatory effect and binding splinters of glass from the examples and comparative examples X Y was how 1063 ÖNORM EN - Draft of June 1, 1993, examined. In this case, test samples were taken from the glass produced in example and comparative examples. This is when measuring samples to units of samples that are prepared for testing. Samples are a certain number of nominally identical glazing units that are provided for type approval for a particular class. The samples, which are provided to type testing, passed for each tested class of three test samples. The size of the test samples was 500 ± 5 mm², The edges of the test samples were finely processed for better handling.

The test samples were conditioned and clamped in rigid frame vertically in the specified in Table 1 distance from the muzzle of the weapon. The clamping of the test samples filled while the following requirements:<ul><li>the test sample was clamped perpendicular to the line of fire;</li><li>between the glass edge and the frame strips were provided neoprene rubber of Shore A hardness 50 ± 10 with a thickness of 5 mm and a width of 30 ± 5 mm;</li><li>of the object edge of the sample A strip of neoprene rubber having a Shore A hardness was 50 ± 10 having a thickness of 5 mm and a width, which was equal to the total thickness of the test sample;</li><li>all four glass edges were clamped uniformly over a width of 30 ± 5 mm of hand that a free hit area of ​​about 440 x 440 mm remained;</li><li>the contact pressure was so high that the glass edges remained during testing at the site, which was on the other hand ensures that no voltages are generated which may affect the result.</li></ul>

From the back of the sample if necessary outgoing broken glass and through the measurement sample penetrating projectile parts were in a splinter collecting box, which was located behind the test sample and is fixed to the rigid frame, collected. had the splinter collecting box from the front an opening of 440 x 440 mm, which matches the incident under.

The potential for injury of the outgoing from the back glass splinters was determined by a splitter indicator. The splitter indicator consists of an aluminum foil having a thickness of 0.02 mm and a square measure of 54 g / m², The aluminum foil was mounted vertically in the fragment collection box at a distance of 500 mm behind of the sample and had an open space of at least 440 x 440 mm, which fit particular to target surface. The aluminum foil was mounted at their edges. She was so rigidly mounted that it remained in place during the test.

The bullet velocity was not more than 2.5 m from the front of the sample measured with an electronic distance measuring device. The measurement was accurate to 1.0 m / s. Here, it is assumed that the projectile velocity corresponds to 2.5 m in front of the measured sample of the impact velocity.

Table 1 also contains the necessary weapons and ammunition types.

The test samples were stored prior to the test at least 12 hours at a temperature of 18 ± 5 ° C.

The measurements were carried out according to the ÖNORM EN 1063rd Here, three shots according to the conditions of ÖNORM EN 1063 has been submitted to measure the projectile velocity in particular each test sample. The distances between the centers of the results amounted Registered in specified in the standard frame. As a result, it was assumed that an examination will satisfy the functional requirements for a particular class resistance against bullets when the speed and distance of results corresponded to the requirements.

The composite according to Example 1 filled the attack loads Class B4 according Draft ÖNORM EN 1063rd <u>LIST OF REFERENCE NUMBERS</u><dl id="dl0003" compact="compact"><dt>1</dt><dd>Fire resistant glazing</dd><dt>2</dt><dd>film</dd><dt>3</dt><dd>Acrylic glass with embedded polyamide threads</dd><dt>3a</dt><dd>polyamide threads</dd><dt>4</dt><dd>12 mm acrylic glass</dd><dt>5</dt><dd>5 mm polycarbonate glass</dd><dt>6</dt><dd>25 mm acrylic glass</dd><dt>7</dt><dd>15 mm acrylic glass</dd><dt>8th</dt><dd>3 mm polycarbonate glass</dd><dt>9</dt><dd>10 mm acrylic glass</dd><dt>10</dt><dd>2 mm polycarbonate glass</dd><dt>11</dt><dd>20 mm acrylic glass</dd><dt>12</dt><dd>30 mm acrylic glass</dd><dt>13</dt><dd>mineral glass</dd><dt>14</dt><dd>not bullet resistant glazing</dd></dl>