High-strength modified polypropylene cable conduit

Abstract

The utility model relates to the technical field of polypropylene cable conduits, in particular to a high-strength modified polypropylene cable conduit, which comprises a first cable conduit, convenient assembly mechanisms are arranged on the surfaces of the first cable conduit and a second cable conduit, and insulation and heat insulation mechanisms are arranged in the first cable conduit and the second cable conduit. And separation protection mechanisms are arranged in the first cable conduit and the second cable conduit. According to the utility model, the cable conduit is more convenient and faster to assemble, is firmer in use, has better insulation effect in use, can achieve better heat insulation effect in use, and is more convenient to use. And when the cable conduit is used, the cables can be separated, so that the phenomenon that the cables are on fire due to winding of the cables is avoided, and the cable conduit is higher in safety performance and more practical in use.

Description

Technical Field

[0001] The utility model relates to the technical field of polypropylene cable conduits, in particular to a high-strength modified polypropylene cable conduit. Background Art

[0002] Polypropylene cable conduit is made of modified polypropylene as the main raw material and is used for construction projects such as laying pipelines and cables in special areas such as roads, railways, buildings, and riverbeds. The raw materials for the production of polypropylene cable conduit are made of polypropylene resin aging-resistant masterbatch in a certain proportion, and the pipe is usually single-walled pipe.

[0003] After searching, the patent number is 201921063739.1, and the name is a modified polypropylene cable conduit for trenchless use, which is characterized in that it includes a pipe and a connector; the pipe is also provided with a wear-resistant layer; a card groove and an O-ring mounting groove are provided on one end of the pipe; an O-ring is installed on the sealing ring mounting groove; the other end of the pipe is arranged to be expanded, and a limit step is provided in the expansion.

[0004] Existing cable conduits typically allow multiple cables to be routed simultaneously. When the cables begin to operate, high temperatures are generated, and conventional polypropylene cannot withstand these high temperatures. Furthermore, existing cable conduits have certain disadvantages. For example, the cable conduits must be assembled before use, which is inconvenient and slow to assemble. Furthermore, the stability of the connection between the assembled conduits is significantly reduced, making the cable conduits less secure during use. During use, the cable conduits require insulation and heat insulation on the surfaces of the first and second cable conduits. Existing cable conduits have poor insulation and heat insulation effects on the surfaces of the first and second cable conduits, which reduces the insulation effect during use and prevents the cable conduits from achieving better heat insulation, making them unsuitable for normal use in high-temperature environments. When used, cables can easily become stacked together, posing a fire hazard. Existing cable conduits lack the ability to separate and fireproof the cables, making it impossible to separate the cables during use. This can easily lead to entanglement and fires, reducing the safety of the cable conduits and making them impractical. Utility Model Content

[0005] The purpose of the present utility model is to provide a high-strength modified polypropylene cable conduit to solve the problems in the above-mentioned background art, namely, that the cable conduit is not convenient to assemble, has poor insulation and heat insulation effects on the surfaces of the first cable conduit and the second cable conduit, and does not have the function of separating and fire-proofing the cables.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a high-strength modified polypropylene cable duct, comprising a first cable duct, a second cable duct provided on one side of the first cable duct, a connecting plate installed on the surface of the first cable duct, and convenient assembly mechanisms provided on the surfaces of the first cable duct and the second cable duct, the interior of the convenient assembly mechanism includes a first magnet, a second magnet and a convenient assembly part, the interior of the first cable duct and the second cable duct are both provided with an insulating and heat-insulating mechanism, the interior of the insulating and heat-insulating mechanism includes an insulating layer, an insulating cavity, an insulating layer, a heat-resistant layer and a thermal insulation layer, the interior of the first cable duct and the second cable duct are both provided with a separation and protection mechanism, the interior of the separation and protection mechanism includes a separation ring, a separation plate and a separation and protection part.

[0007] Preferably, one end of the second cable duct passes through the connecting disk and extends to the interior of the first cable duct, the surface of the second cable duct and the inner wall of the connecting disk are threadedly engaged with each other, and the surfaces of the first cable duct and the second cable duct are both wrapped with a reinforcement layer for enhancing the strength of the first cable duct and the second cable duct.

[0008] Preferably, the convenient assembly part is arranged on the surface of the first cable duct and the second cable duct, and the convenient assembly part is composed of an extension spring, a support block, an arc-shaped clip and a groove body. The surface of the second cable duct is installed with a support block, and the surface of the support block is provided with a groove body. The interior of the groove body is provided with an arc-shaped clip, and the arc-shaped clip and the inner wall of the groove body slide together, and the surface of the arc-shaped clip and the inner wall of the first cable duct are clamped together.

[0009] Preferably, the surface of the arc-shaped clamp is installed with an extension spring, one end of the extension spring is fixed to the surface of the groove body, the surface of the second cable duct is installed with a first magnet, the surface of the connecting plate is installed with a second magnet, and the surface of the second magnet and the surface of the first magnet are magnetically attracted to each other.

[0010] Preferably, the inner walls of the first cable duct and the second cable duct are both adhered with a heat-insulating cavity for insulating the surfaces of the first cable duct and the second cable duct, the material of the heat-insulating cavity is a mineral insulating material, and the interiors of the first cable duct and the second cable duct are both provided with a heat-insulating cavity, the inner walls of the heat-insulating cavity are adhered with a heat-insulating layer, and the interior of the heat-insulating cavity is provided with a heat-resistant layer for insulating the surfaces of the first cable duct and the second cable duct, the material of the heat-resistant layer is a glass fiber material, and the surface of the heat-resistant layer is adhered to the surface of the heat-insulating layer away from the inner wall of the heat-insulating cavity.

[0011] Preferably, the interior of the thermal insulation cavity is provided with an insulation layer for heat-insulating the interior of the first cable duct and the second cable duct, the surface of the insulation layer is bonded to the surface of the heat-resistant layer away from the insulation layer, and the material of the insulation layer is a mixture of Teflon and ceramic fiber.

[0012] Preferably, the separation protection part is arranged inside the first cable duct and the second cable duct, and the separation protection part is composed of a protective layer and a fireproof layer. Separation rings are installed at the center position inside the first cable duct and the second cable duct, and the surface of the separation rings is installed with equally spaced separation plates for separating the cables.

[0013] Preferably, the surfaces of the partition plate and the partition ring are both adhered with a protective layer for protecting the surface of the cable, and the surface of the protective layer is adhered with a fireproof layer for fireproofing between the cables, and the material of the fireproof layer is a mineral fireproof material.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the high-strength modified polypropylene cable conduit not only makes the cable conduit more convenient and quick to assemble, but also greatly improves the stability of the connection between the conduits after assembly, making the cable conduit more secure during use, and achieving better insulation effect during use. At the same time, the cable conduit can achieve better heat insulation effect during use, so that the cable conduit can be used normally in a high-temperature environment. Moreover, the cable conduit can separate the cables during use, avoiding the phenomenon of cables catching fire due to entanglement between the cables, making the cable conduit safer and more practical during use.

[0015] 1. By providing a convenient assembly mechanism, the second cable guide drives the first magnet to move until it contacts the surface of the second magnet on one side of the connecting disk. Under the magnetic attraction of the first magnet and the second magnet, the second cable guide is installed on the surface of the connecting disk. At this time, the arc-shaped clamp is driven to move under the elastic force of the extension spring inside the groove body, so that the arc-shaped clamp is clamped into the interior of the first cable guide. Under the joint action of the arc-shaped clamp and the extension spring, the second cable guide is prevented from loosening, completing the assembly between the first cable guide and the second cable guide, realizing the convenient assembly function of the cable guide, thereby making the cable guide more convenient and quick to assemble, and greatly improving the stability of the connection between the guides after assembly, making the cable guide more secure when in use;

[0016] 2. By providing an insulating and heat-insulating mechanism, the insulation effect of the first cable duct and the second cable duct is improved under the action of the insulating layer. Under the joint action of the insulating layer and the heat-resistant layer inside the heat-insulating cavity, the heat insulation effect of the surface of the first cable duct and the second cable duct is improved. Under the action of the thermal insulation layer, the heat insulation effect of the interior of the surface of the first cable duct and the second cable duct is improved, making the first cable duct and the second cable duct safer and more durable when in use. The cable duct realizes the function of insulating and heat-insulating the surface of the first cable duct and the second cable duct, thereby making the insulation effect of the cable duct better when in use. At the same time, the cable duct can achieve a better heat insulation effect when in use, so that the cable duct can be used normally in a high-temperature environment.

[0017] 3. By providing a separation protection mechanism, one end of the cable passes through the first cable duct and the second cable duct respectively. The cables are separated under the joint action of the separation ring and the separation plate to avoid the cables from being piled up and entangled together. The surface of the cable is protected under the action of the protective layer. The cables are fireproofed under the action of the fireproof layer to avoid fire between the cables. The function of the cable duct to separate and fireproof the cables is realized, so that the cable duct can separate the cables when in use, avoiding the fire of the cables caused by entanglement between the cables, making the cable duct safer and more practical when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0020] Figure 3 It is a schematic diagram of an enlarged side cross-section structure of the utility model;

[0021] Figure 4 For the utility model Figure 2 A schematic diagram of the enlarged structure of the convenient assembly mechanism;

[0022] Figure 5 For the utility model Figure 2 A schematic diagram of the enlarged structure of the insulation and heat insulation mechanism;

[0023] Figure 6 It is an enlarged structural diagram of the separation and protection mechanism of the utility model.

[0024] In the figure: 1. First cable duct; 101. Second cable duct; 102. Connecting plate; 103. Reinforcement layer; 2. Convenient assembly mechanism; 201. First magnet; 202. Second magnet; 203. Convenient assembly part; 2031. Extension spring; 2032. Support block; 2033. Arc-shaped clamp; 2034. Groove body; 3. Insulation and heat insulation mechanism; 301. Insulation layer; 302. Insulation cavity; 303. Insulation layer; 304. Heat-resistant layer; 305. Insulation layer; 4. Separation and protection mechanism; 401. Separation ring; 402. Separation plate; 403. Separation and protection part; 4031. Protective layer; 4032. Fireproof layer. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. In addition, the terms "first", "second", "third", "upper, lower, left, right", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. At the same time, in the description of the present invention, unless otherwise clearly stipulated and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] The utility model provides a high-strength modified polypropylene cable conduit having a structure as follows Figure 1 and Figure 2 As shown, it includes a first cable duct 1, a second cable duct 101 is provided on one side of the first cable duct 1, a connecting disk 102 is installed on the surface of the first cable duct 1, one end of the second cable duct 101 passes through the connecting disk 102 and extends to the interior of the first cable duct 1, the surface of the second cable duct 101 and the inner wall of the connecting disk 102 are threadedly matched with each other, and the surfaces of the first cable duct 1 and the second cable duct 101 are both wrapped with a reinforcement layer 103 for enhancing the strength of the first cable duct 1 and the second cable duct 101.

[0027] Further, if Figure 2 and Figure 4As shown, the surfaces of the first cable duct 1 and the second cable duct 101 are both provided with a convenient assembly mechanism 2, the interior of the convenient assembly mechanism 2 includes a first magnet 201, a second magnet 202 and a convenient assembly portion 203, the convenient assembly portion 203 is provided on the surfaces of the first cable duct 1 and the second cable duct 101, the convenient assembly portion 203 is composed of an extension spring 2031, a support block 2032, an arc-shaped clamp 2033 and a groove body 2034, the surface of the second cable duct 101 is both installed with a support block 2032, and the surface of the support block 2032 is provided with a groove body 2034, An arc-shaped clip 2033 is provided inside the groove body 2034. The arc-shaped clip 2033 and the inner wall of the groove body 2034 slide together. The surface of the arc-shaped clip 2033 is engaged with the inner wall of the first cable duct 1. The surface of the arc-shaped clip 2033 is installed with an extension spring 2031. One end of the extension spring 2031 is fixed to the surface of the groove body 2034. The surface of the second cable duct 101 is installed with a first magnet 201, and the surface of the connecting plate 102 is installed with a second magnet 202. The second magnet 202 and the surface of the first magnet 201 are magnetically attracted to each other.

[0028] During implementation, the second cable duct 101 drives the first magnet 201 to move until it contacts the surface of the second magnet 202 on one side of the connecting disk 102. Under the magnetic attraction of the first magnet 201 and the second magnet 202, the second cable duct 101 is installed on the surface of the connecting disk 102. At this time, under the elastic force of the extension spring 2031 inside the groove body 2034, the arc-shaped clamp 2033 is driven to move, so that the arc-shaped clamp 2033 is clamped to the inside of the first cable duct 1. Under the joint action of the arc-shaped clamp 2033 and the extension spring 2031, the second cable duct 101 is prevented from loosening, completing the assembly between the first cable duct 1 and the second cable duct 101, thereby realizing the function of convenient assembly of the cable duct.

[0029] Further, if Figure 2 and Figure 5As shown, the interior of the first cable duct 1 and the second cable duct 101 are both provided with an insulating heat-insulating mechanism 3, the interior of the insulating heat-insulating mechanism 3 includes an insulating layer 301, an insulating cavity 302, an insulating layer 303, a heat-resisting layer 304 and a thermal insulation layer 305, the inner walls of the first cable duct 1 and the second cable duct 101 are both adhered with an insulating cavity 302 for insulating the surface of the first cable duct 1 and the second cable duct 101, the material of the insulating cavity 302 is a mineral insulating material, the interior of the first cable duct 1 and the second cable duct 101 are both provided with an insulating cavity 302, the inner wall of the insulating cavity 302 is adhered with an insulating The thermal layer 301 and the interior of the thermal insulation cavity 302 are provided with a heat-resistant layer 304 for heat-insulating the surface of the first cable duct 1 and the second cable duct 101. The material of the heat-resistant layer 304 is glass fiber material. The surface of the heat-resistant layer 304 is bonded to the surface of the thermal insulation layer 301 away from the inner wall of the thermal insulation cavity 302. The interior of the thermal insulation cavity 302 is provided with a thermal insulation layer 305 for heat-insulating the interior of the first cable duct 1 and the second cable duct 101. The surface of the thermal insulation layer 305 is bonded to the surface of the heat-resistant layer 304 away from the thermal insulation layer 301. The material of the thermal insulation layer 305 is a mixture of Teflon and ceramic fiber.

[0030] During implementation, the insulation effect of the first cable duct 1 and the second cable duct 101 is improved under the action of the insulating layer 303, and the thermal insulation effect of the surface of the first cable duct 1 and the second cable duct 101 is improved under the joint action of the thermal insulation layer 301 and the heat-resistant layer 304 inside the thermal insulation cavity 302. The thermal insulation effect inside the surface of the first cable duct 1 and the second cable duct 101 is improved under the action of the thermal insulation layer 305, making the first cable duct 1 and the second cable duct 101 safer and more durable when in use, so as to realize the function of the cable duct to insulate and heat-insulate the surface of the first cable duct 1 and the second cable duct 101.

[0031] Further, if Figure 3 and Figure 6As shown, the interior of the first cable duct 1 and the second cable duct 101 are both provided with a separation protection mechanism 4, and the interior of the separation protection mechanism 4 includes a separation ring 401, a separation plate 402 and a separation protection part 403. The separation protection part 403 is arranged inside the first cable duct 1 and the second cable duct 101, and the separation protection part 403 is composed of a protective layer 4031 and a fireproof layer 4032. The first cable duct 1 and the second cable duct 101 are both installed with a separation ring 401 at the center position, and the surface of the separation ring 401 is installed with equally spaced separation plates 402 for separating the cables. The surfaces of the separation plates 402 and the separation ring 401 are both adhered with a protective layer 4031 for protecting the surface of the cables. The surface of the protective layer 4031 is adhered with a fireproof layer 4032 for fireproofing between the cables, and the material of the fireproof layer 4032 is a mineral fireproof material.

[0032] During implementation, one end of the cable passes through the first cable duct 1 and the second cable duct 101 respectively, and the cables are separated by the joint action of the separation ring 401 and the separation plate 402 to avoid the cables from being piled up and entangled together. The surface of the cable is protected by the protective layer 4031, and the fireproof layer 4032 is used to prevent the cables from catching fire, so as to realize the function of the cable duct to separate and fireproof the cables.

[0033] Working principle: When in use, first place the first cable duct 1 at the designated position, and the user places the second cable duct 101 on one side of the first cable duct 1. The user rotates the second cable duct 101 so that one end of the second cable duct 101 moves to the inside of the connecting disk 102 and the first cable duct 1. Under the threaded cooperation of the second cable duct 101 and the connecting disk 102, the second cable duct 101 is initially installed on the surface of the first cable duct 1 and the connecting disk 102. At this time, the second cable duct 101 drives the first magnet 201 to move to contact the surface of the second magnet 202 on one side of the connecting disk 102. Under the action of magnetism, the second cable duct 101 is installed on the surface of the connecting disk 102. At this time, the arc-shaped clamp 2033 is driven to move under the elastic force of the extension spring 2031 inside the groove body 2034, so that the arc-shaped clamp 2033 is clamped into the inside of the first cable duct 1. Under the joint action of the arc-shaped clamp 2033 and the extension spring 2031, the second cable duct 101 is prevented from loosening, and the assembly between the first cable duct 1 and the second cable duct 101 is completed to realize the function of convenient assembly of the cable duct, thereby making the cable duct more convenient and quick to assemble, and the stability of the connection between the ducts after assembly is greatly improved, making the cable duct more secure when in use.

[0034] Subsequently, under the action of the insulating layer 303, the insulation effect of the first cable duct 1 and the second cable duct 101 is improved, and under the joint action of the insulating layer 301 and the heat-resistant layer 304 inside the insulation cavity 302, the thermal insulation effect of the surface of the first cable duct 1 and the second cable duct 101 is better, and under the action of the thermal insulation layer 305, the thermal insulation effect inside the surface of the first cable duct 1 and the second cable duct 101 is better, making the first cable duct 1 and the second cable duct 101 safer and more durable when in use, so as to realize the function of the cable duct to insulate and heat-insulate the surface of the first cable duct 1 and the second cable duct 101, thereby making the insulation effect of the cable duct better when in use, and at the same time, making the cable duct able to achieve better thermal insulation effect when in use, so that the cable duct can be used normally in a high temperature environment.

[0035] Subsequently, one end of the cable passes through the first cable duct 1 and the second cable duct 101 respectively, and the cables are separated by the joint action of the separation ring 401 and the separation plate 402 to avoid the cables from being piled up and entangled together. The surface of the cable is protected by the protective layer 4031, and the cables are fireproofed by the fireproof layer 4032 to avoid fire between the cables, so as to realize the function of the cable duct to separate and fireproof the cables, so that the cable duct can separate the cables when in use, avoiding the fire of the cables caused by entanglement between the cables, making the cable duct safer and more practical when in use, and finally completing the use of the cable duct.

[0036] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A high-strength modified polypropylene cable conduit, comprising a first cable conduit (1), characterized in that: A second cable conduit (101) is provided on one side of the first cable conduit (1), a connection plate (102) is installed on the surface of the first cable conduit (1), and a convenient assembly mechanism (2) is provided on the surface of both the first cable conduit (1) and the second cable conduit (101), and the interior of the convenient assembly mechanism (2) includes a first magnet (201), a second magnet (202) and a convenient assembly portion (203). Both the interior of the first cable conduit (1) and the second cable conduit (101) are provided with an insulating and heat-insulating mechanism (3), and the interior of the insulating and heat-insulating mechanism (3) includes an insulating layer (301), an insulating cavity (302), an insulating layer (303), a heat-resisting layer (304) and a heat-insulating layer (305). Both the interior of the first cable conduit (1) and the second cable conduit (101) are provided with a separation protection mechanism (4), and the interior of the separation protection mechanism (4) includes a separation ring (401), a separation plate (402) and a separation protection portion (403).

2. The high-strength modified polypropylene cable conduit according to claim 1, characterized in that: One end of the second cable duct (101) passes through the connecting disk (102) and extends to the interior of the first cable duct (1); the surface of the second cable duct (101) and the inner wall of the connecting disk (102) are threadedly matched with each other; the surfaces of the first cable duct (1) and the second cable duct (101) are both wrapped with a reinforcement layer (103) for enhancing the strength of the first cable duct (1) and the second cable duct (101).

3. The high-strength modified polypropylene cable conduit according to claim 1, characterized in that: The convenient assembly part (203) is arranged on the surface of the first cable duct (1) and the second cable duct (101), and the convenient assembly part (203) is composed of an extension spring (2031), a support block (2032), an arc-shaped clamp (2033) and a groove body (2034). The surface of the second cable duct (101) is installed with a support block (2032), the surface of the support block (2032) is provided with a groove body (2034), and the interior of the groove body (2034) is provided with an arc-shaped clamp (2033). The arc-shaped clamp (2033) and the inner wall of the groove body (2034) are slidably matched with each other, and the surface of the arc-shaped clamp (2033) and the inner wall of the first cable duct (1) are engaged with each other.

4. The high-strength modified polypropylene cable conduit according to claim 3, characterized in that: The surfaces of the arc-shaped clamps (2033) are all installed with extension springs (2031), one end of the extension springs (2031) is fixed to the surface of the groove body (2034), the surfaces of the second cable guides (101) are all installed with first magnets (201), the surfaces of the connecting disks (102) are all installed with second magnets (202), and the surfaces of the second magnets (202) and the first magnets (201) are magnetically attracted to each other.

5. The high-strength modified polypropylene cable conduit according to claim 1, characterized in that: The inner walls of the first cable duct (1) and the second cable duct (101) are both adhered with a heat-insulating cavity (302) for insulating the surfaces of the first cable duct (1) and the second cable duct (101), the material of the heat-insulating cavity (302) is a mineral insulating material, the interiors of the first cable duct (1) and the second cable duct (101) are both provided with a heat-insulating cavity (302), the inner walls of the heat-insulating cavity (302) are adhered with a heat-insulating layer (301), the interior of the heat-insulating cavity (302) is provided with a heat-resistant layer (304) for insulating the surfaces of the first cable duct (1) and the second cable duct (101), the material of the heat-resistant layer (304) is a glass fiber material, and the surface of the heat-resistant layer (304) is adhered to the surface of the heat-insulating layer (301) away from the inner wall of the heat-insulating cavity (302).

6. The high-strength modified polypropylene cable conduit according to claim 5, characterized in that: The interior of the heat-insulating cavity (302) is provided with a heat-insulating layer (305) for heat-insulating the interior of the first cable conduit (1) and the second cable conduit (101), and the surface of the heat-insulating layer (305) is bonded to the surface of the heat-resistance layer (304) on a side away from the heat-insulating layer (301).

7. The high-strength modified polypropylene cable conduit according to claim 1, characterized in that: The separation protection part (403) is arranged inside the first cable duct (1) and the second cable duct (101), and the separation protection part (403) is composed of a protective layer (4031) and a fireproof layer (4032). A separation ring (401) is installed at the center position inside the first cable duct (1) and the second cable duct (101), and the surface of the separation ring (401) is installed with equally spaced separation plates (402) for separating the cables.

8. The high-strength modified polypropylene cable conduit according to claim 7, characterized in that: The surfaces of the partition plate (402) and the partition ring (401) are both adhered with a protective layer (4031) for protecting the surface of the cable, and the surface of the protective layer (4031) is adhered with a fireproof layer (4032) for fireproofing between the cables, and the material of the fireproof layer (4032) is a mineral fireproof material.

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