JP2014097901A - Fireproof double glazing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fireproof double glazing that can obtain a desired fireproof performance using a glass sheet that is not a fireproof glass sheet.SOLUTION: One glass sheet 12A out of two glass sheets 12A, 12B forming double glazing 10 is composed of a fireproof glass sheet, and the other glass sheet 12B is composed of a glass sheet that is not a fireproof glass sheet. The outside face of the glass sheet 12A composed of a fireproof glass sheet is provided with a non-silver Low-E film 28.

Description

  The present invention relates to a fireproof multilayer glass having fireproof performance.

  A typical multilayer glass is constituted by separating at least two glass plates through a spacer and sealing the periphery with a sealing material.

  By the way, fire-proof and semi-fire-proof buildings (such as various buildings), which are positioned as buildings with high fire resistance, are obliged to install fire prevention equipment (fire doors, etc.) with flame-shielding performance in areas where there is a risk of spreading the outer wall opening. It has been.

  In addition, from the viewpoint of urban fire prevention, in fire prevention and semi-fire prevention areas, buildings other than fire-resistant and semi-fire-resistant buildings (such as detached houses) are also equipped with fire prevention equipment with semi-flame-proofing performance at the part where the outer wall opening may spread. Installation is mandatory.

  Therefore, when using a double glazing for such an opening of the outer wall, it is necessary to have a certain fireproof performance.

  Conventionally, as a multi-layer glass having fire prevention performance, a multi-layer glass using fire glass such as a meshed glass, a heat-resistant tempered glass, a low expansion tempered glass, and a transparent crystallized glass is known as a glass plate constituting the multi-layer glass. (For example, Patent Document 1).

  However, there is a problem that the use of fireproof glass increases the cost. For this reason, in patent document 2, the glass plate of an outdoor side is comprised with plate glass with a heat strengthening degree lower than double strength glass or double strength glass, and the glass plate of an indoor side is plate glass with a higher heat strengthening degree than double strength glass. It is proposed to consist of

  In Patent Document 2, a Low-E film (Low-emissivity film (low radiation film (heat ray reflective film)) is provided on the inner surface (surface on the intermediate layer (also referred to as hollow layer) side) of the glass plate constituting the multilayer glass. It has also been proposed to improve fireproof performance by providing (also referred to as))).

Further, in Patent Document 2, it is mentioned that the CVD film (Low-E film composed of non-silver-based SnO ₂ ) attached to the indoor side glass is the most preferable in terms of fire prevention performance against an outdoor fire. Has been.

  Also in Patent Document 3, it is proposed to improve the fireproof performance by providing a Low-E film on the inner surface of a glass plate that similarly constitutes a multilayer glass.

JP-A-8-67536 JP 2000-109349 A JP-A-8-40747

  By the way, in the multilayer glass provided with the Low-E film, the heat rays are reflected by the Low-E film. For this reason, as in Patent Documents 2 and 3, when a Low-E film is provided on the inner surface of the glass plate constituting the multilayer glass, the glass plate closer to the fire occurrence side than the Low-E film is a fire source. In addition to the amount of heat directly incident from the light, the amount of heat reflected by the Low-E film is also received.

  As described above, when the Low-E film is provided on the inner surface of the glass plate constituting the multilayer glass, the glass plate closer to the fire occurrence side than the Low-E film receives more heat than the normal fire source. Therefore, the glass plate closer to the fire occurrence side than the Low-E film is damaged or the deformation due to heat becomes large, and there is a fear that desired fire prevention performance cannot be obtained.

  Similarly, when a CVD film (non-silver-based Low-E film) is applied to a glass plate on the indoor side that constitutes the multi-layer glass against a fire from the outside as in Patent Document 2, the glass plate on the outdoor side In addition to the amount of heat directly incident from the fire source, the glass plate on the indoor side also receives the amount of heat reflected by the Low-E film. Therefore, both the glass plate on the outdoor side and the glass plate on the indoor side are made of glass. The heat received by the board is severe. For this reason, there is a high possibility that either glass plate will be cracked or deformed by heat, and the desired fireproof performance may not be obtained.

  On the other hand, in order to ensure a desired fireproof performance, when a fireproof glass plate is used for the glass plate which comprises a multilayer glass, there exists a problem that cost will become high.

  This invention is made | formed in view of such a situation, and it aims at providing the fireproof multilayer glass from which desired fireproof performance is obtained.

  Means for solving the above problems are as follows.

  The first aspect is a multi-layer glass in which a plurality of glass plates are spaced apart with a spacer and a peripheral edge portion is sealed with a sealing material, and the plurality of glass plates are at least one sheet. A non-silver-based low radiation film is provided on the outer surface of one of the two glass plates arranged in the outermost layer, including a fire-proof glass plate and at least one glass plate that is not a fire-proof glass plate. It is a multilayer glass for fire prevention characterized by being made.

  According to this aspect, the plurality of glass plates constituting the fireproof multilayer glass include at least one fire glass plate and at least one glass plate that is not a fire glass plate. A non-silver-based low radiation film (Low-E film) is provided on the outer surface of one of the two glass plates arranged in the outermost layer. For example, when the multi-layer glass is composed of two glass plates, one glass plate is composed of a fireproof glass plate, and the other glass plate is composed of a glass plate that is not a fireproof glass plate. Then, a non-silver-based low radiation film is provided on the outer surface of one of the two glass plates arranged in the outermost layer. By providing a low radiation film on the outer surface of the glass plate constituting the outermost layer, the amount of heat received by the glass plate farther from the fire occurrence side than the low radiation film can be reduced. In general, a non-silver film is more excellent in heat resistance and durability than a silver film. By these, the temperature rise of the glass plate farther from the fire occurrence side than the low radiation film can be suppressed, and it is possible to suppress the cracking or deformation due to heat during a fire. Thereby, although at least 1 sheet | seat is comprised with a fireproof glass plate, the glass plate which is not a fireproof glass plate can be used for another glass plate, and manufacturing cost can be held down, ensuring desired fireproof performance. On the other hand, there is a problem that the low radiation film is easily scratched by applying the low radiation film to the outer surface, but the scratch problem can be solved by providing the non-silver-based low radiation film. . That is, a silver-based low-emission film (so-called low-emission film composed mainly of silver (Ag) as a main component) is easily damaged, but is a non-silver-based low-emission film that has better scratch resistance and durability. By imparting, scratches can be prevented and stable fireproof performance can be maintained over a long period of time.

  Of the two glass plates arranged in the outermost layer, which side of the glass plate is provided with the low radiation film is determined depending on which side is set as the heating side (flame side). That is, a non-silver-based low radiation film is provided on the outer surface of the glass plate on the heating side (the glass plate on the side opposite to the side on which flame intrusion is desired to be prevented). Thereby, the glass plate on the opposite side to the heating side can be effectively protected.

  The second aspect is a multi-layer glass in which a plurality of glass plates are spaced apart via a spacer and the peripheral edge portion is sealed with a sealing material, and each glass plate is not a fireproof glass plate. And a non-silver-based low emission film is provided on the outer surface of one of the two glass plates arranged in the outermost layer.

  According to this aspect, each glass plate constituting the multi-layer glass is constituted by a glass plate that is not a fireproof glass plate, and the two glass plates arranged in the outermost layer are not on the outer surface of one glass plate. A silver-based low emission film (Low-E film) is provided. For example, when the multilayer glass is composed of two glass plates, both are composed of glass plates that are not fire-resistant glass plates, and a non-silver-based low radiation film is provided on the outer surface of one glass plate. The As described above, by providing the low radiation film on the outer surface of the glass plate constituting the outermost layer, the amount of heat received by the glass plate farther from the fire occurrence side than the low radiation film can be reduced. In general, a non-silver film is more excellent in heat resistance and durability than a silver film. By these, the temperature rise of the glass plate farther from the fire occurrence side than the low radiation film can be suppressed, and it is possible to suppress the cracking or deformation due to heat during a fire. Thereby, the glass plate which is not a fireproof glass plate can be used for the glass plate which comprises a multilayer glass, and manufacturing cost can be restrained, ensuring desired fireproof performance. Moreover, by providing a non-silver-based low radiation film as described above, scratches can be prevented and stable fireproof performance can be maintained over a long period of time.

  Of the two glass plates arranged in the outermost layer, which side of the glass plate is provided with the low radiation film is determined depending on which side is the heating side (flame side). That is, a non-silver-based low radiation film is provided on the outer surface of the glass plate on the heating side (the glass plate on the side opposite to the side on which flame intrusion is desired to be prevented). Thereby, the glass plate on the opposite side to the heating side can be effectively protected.

  According to a third aspect, in the multilayer glass of the first or second aspect, a non-silver-based low radiation film is provided on the outer surface of both glass plates of the two glass plates arranged in the outermost layer. It is an aspect.

  According to this aspect, the non-silver-based low radiation film is provided on the outer surfaces of both glass plates of the two glass plates arranged in the outermost layer. That is, a non-silver-based low radiation film is provided on both of the two glass plates arranged in the outermost layer. Thereby, it can respond to the heat from both.

  The fourth aspect is an aspect in which the non-silver-based low radiation film is mainly composed of tin oxide in the multilayer glass of any one of the first to third aspects.

According to this aspect, the non-silver-based low emission film is mainly composed of tin oxide (SnO ₂ ). The low radiation film mainly composed of tin oxide (SnO ₂ ) is resistant to scratches and can secure stable performance for a long period of time even when applied to the outer surface.

  The fifth aspect is an aspect in which the non-silver-based low emission film has an antireflection layer on the tin oxide layer in the multilayer glass of the fourth aspect.

According to this aspect, in the non-silver-based low radiation film mainly composed of tin oxide (SnO ₂ ), the antireflection layer is provided on the tin oxide layer. Thereby, reflection of light by the tin oxide layer can be suppressed, and a feeling of glare can be suppressed.

  6th aspect WHEREIN: In the multilayer glass of the said 1st or 2nd aspect, the inner side of the glass plate in which the non-silver type low radiation film | membrane is not provided among the two glass plates arrange | positioned in the outermost layer Alternatively, a silver-based low emission film is provided on the outer surface.

  According to this aspect, the silver-based low radiation film is provided on the inner or outer surface of the glass plate that is not provided with the non-silver-based low radiation film among the two glass plates arranged in the outermost layer. It is done. By further providing a silver-based low emission film (so-called low emission film composed mainly of silver (Ag)) having excellent heat insulation, the heat insulation can be improved.

  According to the present invention, even if a glass plate that is not a fireproof glass plate is used, desired fireproof performance can be ensured.

Sectional drawing which shows one Embodiment of multilayer glass Sectional drawing which shows one Embodiment of the multilayer glass comprised with three glass plates Sectional drawing of the multilayer glass to which the Low-E film | membrane was provided to the outer surface of both the glass plates of the two glass plates which comprise an outermost layer Cross-sectional view of a multilayer glass provided with a non-silver-based Low-E film and a silver-based Low-E film

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing an embodiment of a multilayer glass according to the present invention.

  As shown in the figure, the multi-layer glass 10 of the present embodiment is composed of two glass plates 12A and 12B that are opposed to each other with a certain distance.

  The two glass plates 12A and 12B are configured such that one glass plate (first glass plate) 12A is a "fire glass plate" and the other glass plate (second glass plate) 12B is a "fire glass plate". Comprised of "no glass plate".

  Here, “fireproof glass” refers to plate glass that is one of the main materials constituting fireproof equipment approved by the Minister of Land, Infrastructure, Transport and Tourism. Fireproof glass is mainly classified into “mesh plate glass” and “heat-resistant plate glass”.

  “Meshed plate glass” refers to a meshed glass plate defined by JIS R3204 (netted glass plate and lined glass plate).

  “Heat-resistant plate glass” refers to a plate glass defined by the “heat-resistant plate glass quality standard” established by the Association of Curtain Walls and Fire Protection Openings. The heat-resistant plate glass is a so-called single plate glass without a net, and there are three types of “low-expansion fireproof glass”, “heat-resistant tempered glass”, and “heat-resistant crystallized glass”.

  Both the flat sheet glass and the heat-resistant glass sheet are glass sheets having a flame shielding performance of 20 minutes or more by a test method according to the evaluation work method document of the designated performance evaluation organization approved by the Minister of Land, Infrastructure, Transport and Tourism.

  “A glass plate that is not a fireproof glass plate” refers to a glass plate other than the fireproof glass plate defined as described above. Therefore, in addition to ordinary float glass, tempered glass, double-strength glass, chemically tempered glass, and the like are included in the “glass plate that is not a fireproof glass plate”.

It should be noted that a glass plate having a strength increased by forming a compressive stress layer on the surface of the glass, such as tempered glass, double-strength glass, or chemically tempered glass (the glass has a surface compressive stress of 20 [MN / m ² ] or more. The glass plate) is not fire glass, but has a certain heat resistance. Therefore, in the present specification, these glass plates are referred to as “quasi-fire glass plates” and are distinguished from other glass plates among glass plates that are not fire glass plates.

  “Tempered glass” refers to glass defined by JIS R3206 (tempered glass), and “double strength glass” refers to glass defined by JIS R3222 (double strength glass). Further, “chemically tempered glass” refers to glass whose strength is increased by forming a compressive stress layer on the surface of the glass by a chemical tempering method.

In addition, among glass plates that are not fire-resistant glass plates, glass plates that are not semi-fire-resistant glass plates, that is, the surface of glass regardless of so-called wind-cooling strengthening method (also called physical strengthening method or heat strengthening method) or chemical strengthening method. For a glass plate that is not a glass plate having a strength increased by forming a compressive stress layer on it (in terms of glass surface compressive stress, a glass plate of less than 20 [MN / m ² ]), It is referred to as “non-fire-proof glass plate” and is distinguished from the semi-fire-proof glass plate among glass plates that are not fire-proof glass plates. This non-fireproof glass plate includes ordinary float glass and the like.

  As described above, in the multi-layer glass 10 of the present embodiment, one glass plate (first glass plate) 12A is composed of a “fireproof glass plate” and the other glass plate (second glass plate) 12B. Is composed of a “glass plate that is not a fireproof glass plate”.

  The two glass plates 12 </ b> A and 12 </ b> B are spaced from each other with a spacer 16 interposed therebetween. The spacer 16 is disposed along the periphery of the glass plates 12A and 12B so that the distance between the two glass plates 12A and 12B is kept constant. An intermediate layer (hollow layer) 14 is formed between the two glass plates 12A and 12B arranged in this way.

  The surface of the spacer 16 facing the glass plates 12A and 12B is bonded to the glass plates 12A and 12B by the primary sealing materials 18A and 18B. Further, the secondary sealant 20 is filled outside the spacer 16 (on the side opposite to the intermediate layer 14). The secondary sealing material 20 is filled in a concave space formed between the spacer 16 and the two glass plates 12A and 12B, and is disposed in contact with the primary sealing materials 18A and 18B. The intermediate layer 14 is sealed (sealed) by the secondary sealing material 20 and the primary sealing materials 18A and 18B.

  The spacer 16 is formed in a hollow shape. Vent holes 22 are formed at a constant pitch along the longitudinal direction of the spacer 16 (the direction perpendicular to the paper surface) on the inner surface (on the intermediate layer 14 side) of the spacer 16. The vent hole 22 is formed so as to penetrate the hollow portion 24 of the spacer 16 and communicates the hollow portion 24 and the intermediate layer 14. The hollow portion 24 of the spacer 16 is filled with a desiccant 26 such as granular zeolite. Thereby, the air of the intermediate layer 14 is dried.

  As the spacer 16, a metal spacer mainly made of aluminum is used. However, when it is necessary to reduce the heat conduction in the periphery of the multilayer glass, stainless steel, which is a metal having a relatively low thermal conductivity, is used. It is preferable to use a material made of a material or a hard resin.

  Further, as the primary sealing materials 18A and 18B, butyl rubber which is not usually subjected to crosslinking treatment or a material based on polyisobutylene and containing a filler such as carbon black for the purpose of coloring and reinforcement is suitable.

  Further, as the secondary sealing material 20, a material based on a curable elastomer such as polysulfide, silicone, urethane, or the like, which has been appropriately modified in order to develop adhesiveness with glass, is suitable.

The multi-layer glass 10 configured as described above includes a Low-E film (low emission film) 28 on the outer surface (surface opposite to the intermediate layer 14) of the glass plate 12A formed of a fire-proof glass plate. It is done. The Low-E film 28 is a non-silver Low-E film, for example, a Low-E film mainly composed of tin oxide (SnO ₂ ).

In this way, by forming the Low-E film 28 on the outer surface of the glass plate 12A composed of a fire-proof glass plate, the amount of heat received by the glass plate 12A against a fire from the glass plate 12A side is reduced. Can do. Thereby, it can suppress that the glass plate 12A is heated at the time of a fire, and it can make it difficult to break the glass plate 12A and to produce a big deformation | transformation. In addition, this makes it difficult to transfer heat to the other glass plate (second glass plate) 12B, so that the other glass plate (second glass plate) 12B is not a fire-resistant glass plate. Even if it is comprised by, the crack can be prevented effectively. In addition, by providing a non-silver-based Low-E film 28, such as a Low-E film mainly composed of tin oxide (SnO ₂ ), scratches during normal use can be prevented, and long-term stable performance can be achieved. Can be secured.

<< Other Embodiments >>
<Mode in which all glass plates are made of glass plates that are not fire-proof glass plates>
In the above embodiment, in the multi-layer glass composed of two glass plates, one glass plate is composed of “fire glass plate” and the other glass plate is composed of “glass plate which is not fire glass plate”. However, the application of the present invention is not limited to this. The present invention can also be applied to a case where both glass plates are constituted by “a glass plate that is not a fireproof glass plate”. That is, in the multilayer glass 10 having the configuration shown in FIG. 1, the present invention can also be applied to a case where both of the two glass plates 12A and 12B are configured as “glass plates that are not fire glass plates”.

  As described above, even in the multilayer glass composed of both “glass plates that are not fire-resistant glass plates”, the temperature increase of the glass plates 12A and 12B can be suppressed by providing the Low-E film on the outer surface. And fireproof performance can be improved.

  In addition, which side of the two glass plates 12A and 12B is provided with the Low-E film is determined depending on which side is set as the heating side (flame side). That is, the Low-E film is applied to the outer surface of the glass plate on the heating side (the glass plate on the side opposite to the side on which flame intrusion is desired to be prevented). Thereby, the glass plate on the opposite side to the heating side can be effectively protected, and even if the glass plate on the opposite side to the heating side is composed of a glass plate that is not a fire prevention glass plate, the desired fire prevention performance is achieved. Can be secured.

<Aspect of constituting a multilayer glass with three or more glass plates>
In the said embodiment, although the case where a multilayer glass was comprised with two glass plates was demonstrated to the example, application of this invention is not limited to this. Multi-layer glass can also be constituted by three or more glass plates. In this case, a Low-E film is provided on the outer surface of at least one of the two glass plates constituting the outermost layer.

  FIG. 2 is a cross-sectional view of a multilayer glass composed of three glass plates.

  As shown in the figure, the multilayer glass 10 is composed of three glass plates (a first glass plate 12A, a second glass plate 12B, and a third glass plate 12C).

  The first glass plate 12A and the second glass plate 12B are spaced apart via the first spacer 16A, and the second glass plate 12B and the third glass plate 12C replace the second spacer 16B. Spaced apart.

  Between the first glass plate 12A and the second glass plate 12B, a first intermediate layer 14A is formed, and between the second glass plate 12B and the third glass plate 12C, the second The intermediate layer 14B is formed.

  12 A of 1st glass plates are comprised with a fire prevention glass plate, and the 2nd glass plate 12B and the 3rd glass plate 12C are glass plates (semi-fire prevention glass plate or non-fire prevention glass plate) which are not a fire prevention glass plate. Composed.

  A non-silver Low-E film 28 is provided on the outer surface (opposite the intermediate layer) of the first glass plate 12A.

  Thus, by providing the Low-E film 28 on the outer surface of the glass plate (first glass plate 12A) constituting the outermost layer, the glass plate is heated against a fire from the glass plate 12A side. It can be suppressed, and it is hard to break at the time of a fire, and it can make it difficult to produce a big deformation. Thereby, it can suppress that another glass plate (2nd glass plate 12B and 3rd glass plate 12C) is heated, and other glass plates (2nd glass plate 12B and 3rd glass). Even if the plate 12C) is a glass plate that is not a fireproof glass plate, the cracking can be effectively prevented.

  In addition, by providing a non-silver-based Low-E film, even when the Low-E film is disposed on the outer surface, it is difficult to be damaged, and stable fireproof performance can be ensured for a long period of time.

  In addition, in this example, although 12 A of 1st glass plates are comprised with a fire prevention glass plate, it comprises all the glass plates with the glass plate (semi-fire prevention glass plate or non-fire prevention glass plate) which is not a fire prevention glass plate. You can also.

<Aspect where non-silver-based Low-E film is provided on both outer surfaces>
In the said embodiment, although it is set as the structure which provides a Low-E film | membrane only to one of the two glass plates which comprise an outermost layer, as shown in FIG. 3, two glass plates 12A which comprise an outermost layer , 12B may be provided with a non-silver Low-E film 28 on both outer surfaces. Thereby, even if it is a case where it is a case where it heats from the surface of which side, the crack of glass plate 12A, 12B can be suppressed.

<Aspect to further provide a silver-based Low-E film>
In the above embodiment, only the non-silver-based Low-E film is provided. However, in addition to the non-silver-based Low-E film, a silver-based Low-E film may be provided. it can. For example, as shown in FIG. 4, a non-silver Low-E film 28 is applied to one glass plate 12A of two glass plates 12A and 12B constituting the outermost layer, and silver is applied to the other glass plate 12B. It is also possible to adopt a configuration in which a system Low-E film 30 is provided. Since the silver-based Low-E film (Low-E film mainly composed of silver (Ag)) has excellent heat shielding properties, the heat-shielding property can be improved by further providing a silver-based Low-E film. it can.

  In the example shown in FIG. 4, a non-silver-based Low-E film 28 is applied to the outer surface of one glass plate 12A, and a silver-based Low-E film 30 is applied to the inner surface of the other glass plate 12B. However, the silver-based Low-E film 30 can also be applied to the outer surface of the glass plate 12B. However, in consideration of scratches and the like, it is preferable to apply to the inner surface of the glass plate 12B as in the example shown in FIG.

<< Configuration of Low-E film >>
In general, Low-E films include those mainly composed of tin oxide (SnO ₂ ) or indium oxide (In ₂ O ₃ ) and those mainly composed of silver (Ag).

  Low-E film (silver-based Low-E film) mainly composed of silver (Ag) has low emissivity (JIS R3107 (Calculation method of thermal resistance of plate glass and heat transmissivity in architecture)) The vertical emissivity ε is approximately 0.1 or less), and has an advantage of having excellent heat shielding properties, but has a disadvantage of being vulnerable to scratches. In addition, it is weak against moisture, easily oxidized by heating, and inferior in heat resistance. For this reason, when a silver-based Low-E film is applied to the outer surface of the glass plate constituting the multi-layer glass, the Low-E film is damaged or peeled off under normal use, and stable fire protection for a long period of time. The performance cannot be maintained.

  Therefore, in the present invention, a non-silver Low-E film is used. Examples of the non-silver Low-E film include a Low-E film mainly composed of tin oxide or indium oxide as described above. Such a non-silver Low-E film has a relatively high emissivity (vertical emissivity is 0.15 or more), but has an advantage of being resistant to scratches with little deterioration due to heat.

  The Low-E film mainly composed of tin oxide or indium oxide can be applied to the surface of the glass plate by a process such as sputtering or spraying. For example, a tin oxide film or tin doped with fluorine or antimony can be used. A doped indium oxide film or the like can be used as the Low-E film.

In the case where the main component is tin oxide or indium oxide, an antireflection layer (film) is preferably provided on the tin oxide or indium oxide layer (film) in order to suppress glare. The antireflection layer can be formed of, for example, SiO ₂ or the like.

  As described above, the non-silver Low-E film mainly composed of tin oxide or the like has a relatively high emissivity, but it is preferable to use an emissivity that is as low as possible. For example, it is preferable to use a non-silver Low-E film having a vertical emissivity of 0.15 to 0.5.

  The film thickness of the Low-E film is preferably about 300 nm to 1500 nm.

  Moreover, a Low-E film | membrane can also be provided to a glass plate in multiple layers, such as two layers and three layers, in multiple layers.

  DESCRIPTION OF SYMBOLS 10 ... Multi-layer glass, 12A ... Glass plate (1st glass plate), 12B ... Glass plate (2nd glass plate), 12C ... 3rd glass plate, 14 ... Intermediate layer, 14A ... 1st intermediate layer , 14B ... second intermediate layer, 16 ... spacer, 16A ... first spacer, 16B ... second spacer, 18A ... primary sealant, 18B ... primary sealant, 20 ... secondary sealant, 22 ... vent , 24 ... hollow part, 26 ... desiccant, 28 ... Low-E film (non-silver type), 30 ... Low-E film (silver type)

Claims (6)

A plurality of glass plates are spaced apart via a spacer, and a peripheral glass is a multi-layer glass constituted by sealing with a sealing material,
The plurality of glass plates include at least one fire glass plate and at least one glass plate that is not a fire glass plate, and the outer side of one of the two glass plates arranged in the outermost layer. A multilayer glass for fire prevention, characterized in that a non-silver-based low radiation film is provided on the surface. A plurality of glass plates are spaced apart via a spacer, and a peripheral glass is a multi-layer glass constituted by sealing with a sealing material,
A fireproof multilayer glass comprising a non-silver-based low radiation film on an outer surface of a glass plate provided on a heating side among two glass plates arranged in an outermost layer.   The multilayer glass for fire prevention according to claim 1 or 2, wherein a non-silver-based low radiation film is provided on the outer surface of both glass plates of the two glass plates arranged in the outermost layer.   The fireproof multilayer glass according to any one of claims 1 to 3, wherein the non-silver-based low radiation film is mainly composed of tin oxide.   The multilayer glass for fire prevention according to claim 4, wherein the non-silver-based low radiation film has an antireflection layer on the tin oxide layer.   Of the two glass plates arranged in the outermost layer, a silver-based low radiation film is provided on the inner or outer surface of the glass plate on which the non-silver-based low radiation film is not provided. The multilayer glass for fire prevention according to claim 1 or 2.

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