JPH08287737A - Fire risistant wire - Google Patents

Abstract

PURPOSE: To maintain insulation property for longer hours than that of the fire resistant test standard of the Fire Defence Agency notice so as to feed electric power stably by winding a specific laminated mica tape on a conductor specifically, and extruding covering the same with an insulating body of polyolefin. CONSTITUTION: Two to four laminated mica tapes, which are made by laminating soft composite mica of 0.09 to 0.15mm in thickness and backing material made of film of PE, PP, and the like or glass cloth mutually, are wound by means of 1/2 to 1/10 lapping or longitudinal lapping on a conductor 2 so as to form a fire resisting layer 6, and thereafter, an insulating body 7 made of polyolefin is extruding covered thereon so as to form an insulated wire core 20 of a fire resistant wire 1. Plural wire cores 20 are twisted together with inclusion 9 of paper, jute, PP plastic filler and a pressing winding tape 10 is wound thereon. A sheath layer 11 made of non-halogen flame resisting polyolefin or polyvinyl chloride is formed by extruding so as to cover the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of maintaining insulation performance for a longer period of time and stably supplying electric power without lowering insulation resistance when exposed to high heat or flame due to fire or the like. Concerning fireproof electric wires.

[0002]

2. Description of the Related Art Generally, in a place where a large number of people gather, such as in a theater or a department store, in case of a fire or the like, an emergency exit light such as an emergency exit light is provided in order to safely guide people on the site to the emergency exit. , It is required to keep the lights on for a certain period of time to complete evacuation. Therefore, with regard to fire-resistant electric wires used for wiring fire-extinguishing equipment, alarm equipment, and evacuation equipment in fire-resistant objects, the Japan Cable Manufacturers Association has voluntarily established its own certification criteria for fire-resistant electric wires, etc. We are trying to ensure the quality of materials.
In the present specification, the term "fireproof electric wire" refers to a generic term for cables having fireproof performance specified by Fire Service Agency Notification No. 7 of 1978. This fireproof wire has a structure as shown in FIG. That is, the refractory electric wire 1 has a soft natural laminated mica (phlogopite) 3 having a thickness of 0.09 to 0.15 mm on the outer periphery of the conductor 2 and a thickness of 0.015 to 0.030 mm.
The laminated mica tape 5 obtained by laminating the backing material 4 made of polyethylene (PE), polypropylene (PP) or the like film or glass cloth as shown in FIG. 6 is 1/2 to 1/10.
Wrap 2 to 4 sheets as needed with wrapping or vertical attachment,
A fire-resistant layer 6 is formed, and an outer periphery of the fire-resistant layer 6 is extruded and covered to form an insulating wire core 8. The insulating wire core 8 is used as an inclusion 9 of paper, jute, and PP defibrated yarn. After twisting together a plurality of (for example, three) windings, the winding tape 10 is wound, or the winding tape 10 is applied on the insulating core wire 6 if necessary, and then a plurality of pieces (for example, three) are included together with the inclusions 9. (3) After twisting, the holding tape 10 was wound, and the sheath layer 11 made of halogen-free flame-retardant polyolefin or polyvinyl chloride was formed by extrusion.

The laminated mica tape 5 constituting the refractory layer 6 includes a soft natural laminated mica (phlogopite) 3 having a thickness of 0.09 to 0.15 mm and polyethylene (PE) having a thickness of 0.015 to 0.030 mm. What is laminated with the film 12 (Fig. 7), a soft natural laminated mica (phlogopite) 3 having a thickness of 0.09 to 0.15 mm and a polypropylene (PP) film 13 having a thickness of 0.015 to 0.030 mm. (Fig. 8), a combination of soft natural laminated mica (phlogopite) 3 having a thickness of 0.09 to 0.15 mm and a glass cloth 14 having a thickness of 0.015 to 0.030 mm ( FIG. 9) is used.
The laminated mica tape 5 is obtained by laminating scale-shaped mica foils and adhering them with a silicone resin to form a tape, and natural mica (phlogopite) formed into a scale is used.

[0004]

However, this conventional refractory electric wire is a fireproof test (J.
Heat for 30 minutes according to the fire temperature curve of ISA1304)
In this case, the standard (remaining insulation for 30 minutes after being exposed to a flame after a fire has occurred) is sufficiently satisfied, but if combustion continues for a longer time (more than 30 minutes), the insulation of the fire-resistant wire The insulation property of is not maintained, causing a short circuit between lines. In recent years, office buildings have become taller and deeper in large cities, and underground stations run horizontally around the station centering on the station, rapidly expanding the area of underground stations. When a fire occurs in such a skyscraper, the elevators cannot be used, and the people inside the building must walk down the stairs to work or live in the building. It takes a considerable amount of time to evacuate people safely and surely, and the expansion of underground shopping areas leads to an increase in the number of people who are working and shopping in underground shopping areas, and these people are safe. It takes a considerable amount of time to evacuate quickly and reliably,
It is not enough to retain the insulation property for 30 minutes by exposing it to a flame after the occurrence of a fire as in the conventional case, and it is required to retain the insulation property for a long time.

The object of the present invention is to carry out a fire resistance test according to the Fire Service Agency Notification No. 3 (in accordance with the fire temperature curve of JIS A1304 30
30 minutes of exposure to flames after a fire
That is to maintain the insulating property for a longer time than to maintain the insulating property, and to enable stable power supply.

[0006]

According to the first aspect of the present invention,
Integrated mica tape in which synthetic mica is laminated with backing material on the conductor and integrated into one or more sheets 1/2 to 1 /
It is wound in 10 wraps or vertically attached, and an insulator made of polyolefin is extruded and coated on the mica tape.

According to a second aspect of the present invention, one or a plurality of laminated mica tapes in which a synthetic mica is laminated with a backing material and integrated on a conductor are wound in a 1/2 to 1/10 lap or vertically attached. Then, an insulating wire core is formed by extruding an insulator made of polyolefin on this laminated mica tape by extrusion, and the insulating wire core is twisted together with a plurality of inclusions and wound with a glass tape, a paper tape or a ceramic paper. A non-halogen flame-retardant polyolefin or polyvinyl chloride is extruded to form a sheath layer.

According to a third aspect of the present invention, an integrated mica tape is formed by integrally bonding synthetic mica having a thickness of 0.09 mm to 0.15 mm with a backing material made of a synthetic resin tape or glass cloth. Is.

According to a fourth aspect of the present invention, the synthetic mica is composed of fluorinated phlogopite.

[0010]

According to the invention of claim 1, a soft synthetic laminated mica (fluorinated phlogopite) having a thickness of 0.09 to 0.15 mm and a film of PE, PP or the like, or a backing made of glass cloth is formed on the conductor. Two to four laminated mica tapes, which are laminated with each other, are wound by 1/2 to 1/10 wrap winding or vertical attachment, a fire resistant layer is formed, and then an insulator made of polyolefin is extrusion-coated. For this reason, it is longer than the standard of fire resistance test (heating for 30 minutes according to the fire temperature curve of JIS A1304) by Fire Service Agency Notification No. 3 (after a fire occurs, it is exposed to flames and retains insulation for 30 minutes). Insulation can be maintained throughout, and stable power can be supplied.

According to the second aspect of the present invention, a soft synthetic laminated mica (fluorinated phlogopite) having a thickness of 0.09 to 0.15 mm and a film such as PE or PP or a backing made of glass cloth is formed on the conductor. 2-4 sheets of laminated mica tape, which is laminated with materials, is wrapped by 1 / 2-1 / 10 wrapping or vertical attachment, and after forming a fireproof layer, extruded and covered with an insulator made of polyolefin to form an insulated wire core. To do. Then, after twisting a plurality of this insulated wire core together with paper, jute, and PP defibrated yarn, wind a presser-wrapping tape, or after applying a presser-wrapping tape on the insulated wire core, if necessary A sheath layer is formed by extrusion of a combustible polyolefin or polyvinyl chloride. Unlike the conventional polyester non-woven fabric, nylon non-woven fabric, polypropylene, and polyester tape, glass tape, paper tape, and ceramics paper are used for this press-wrap tape. Therefore, the conventional refractory layer is reinforced, and even if it is exposed to a flame for a long period of time, it retains its insulating property and can be stably ionized and supplied. When a fire resistance test is performed according to the fire temperature curve of JIS A1304 It can withstand heating for a time (normal temperature to 925 ° C.).

According to the third aspect of the invention, the laminated mica tape is formed by integrally bonding synthetic mica having a thickness of 0.09 mm to 0.15 mm with a backing material made of synthetic resin tape or glass cloth. Therefore, the conventional refractory layer can be strengthened, and the insulation can be maintained even when exposed to a flame for a long time.

According to the fourth aspect of the present invention, since the synthetic mica is composed of fluorinated phlogopite, the conventional refractory layer is reinforced and the insulation is maintained even when exposed to a flame for a long time. be able to.

[0014]

Embodiments of the present invention will be described below. 1 to 3 show an embodiment of the fireproof electric wire according to the present invention. In the figure, a soft synthetic mica tape composed of a synthetic mica 15 having a thickness of 0.12 mm and a backing material 16 made of glass cloth having a thickness of 0.03 mm as shown in FIG. 17 is synthetic mica 15
The fire-resistant layer 6 is formed by winding three sheets with 1/3 wrap, with the side surface facing the conductor 2. On the outer periphery of the refractory layer 6, colored polyester tape 1 as shown in FIG.
After wrapping 8 with 1/5 wrap, the insulation 7 made of polyethylene is extruded and covered to form the insulation core 20.
Are formed. The colored polyester tape 18 is used for coloring each insulating wire core 20, and is not taped when coloring is not required.

The insulated wire core 20 is made of paper, jute, or PP.
Multiple pieces (for example, 3 pieces) together with the inclusion 9 of defibrated yarn
After twisting, the holding tape 10 is wound and the sheath layer 11 made of halogen-free flame-retardant polyolefin or polyvinyl chloride is covered by extrusion.
The holding tape 10 includes a glass tape (glass cloth having a thickness of 0.18 mm) different from conventional polyester non-woven fabric, nylon non-woven fabric, polypropylene and polyester tape, paper tape, ceramic paper (mixed with alumina fiber and pulp to have a thickness). The thickness of 0.12mm is 0.0
Use a 25 mm polyethylene film bonded together. As shown in FIG. 3, the soft synthetic mica tape 17 is formed by laminating synthetic mica 15 and adhering it with a silicone resin to form a tape, which is attached to the backing material 16. The synthetic mica 15 is a synthetic mica and has a scaly shape. As the synthetic mica, fluorophlogopite containing talc as a main component is suitable. Also, the silicone resin is
Organosilicon compound, organohalogenosilane (R ₂ S
A resinous substance is obtained by forming a network bond by hydrolysis and condensation polymerization of iX ₂ ). The properties of this silicone resin are extremely excellent in heat resistance and moisture resistance, and excellent in electrical insulation performance.

FIG. 4 shows a soft synthetic mica tape 17
FIG. 4 shows another embodiment of the soft synthetic mica tape 17 shown in FIG. 4, in which the soft synthetic mica tape 17 shown in FIG. 3 is formed by a synthetic mica 15 having a thickness of 0.12 mm and a glass cloth. The backing material 16 is laminated, but the synthetic mica 15 having a thickness of 0.12 mm and ceramic paper (alumina fiber and pulp laminated on a polyethylene film) are used. The backing material 19 is attached to the backing material 19.

The characteristics of the fire resistant electric wire using the soft synthetic laminated mica tape of the embodiment (synthetic mica and glass cloth) shown in FIG. 3 and the soft synthesis of the embodiment (synthetic mica and ceramic paper) shown in FIG. Table 1 shows the characteristic test results of the characteristics of the fireproof electric wire using the laminated mica tape and the characteristics of the fireproof electric wire using the conventional soft natural laminated mica tape.

The fireproof electric wire of Example 1 used for the characteristic test was prepared by laminating a 0.12 mm thick synthetic mica (fluorinated phlogopite) and a glass cloth on a conductor wire having a cross-sectional area of 14 mm ^2. The soft synthetic mica tape constructed is stacked and wound, and the insulating core formed by extruding an insulator on this soft synthetic mica tape is twisted together with the three cores and inclusions, and is wound. A cable having a sheath formed by extruding non-halogen flame-retardant polyolefin and covering it after winding and pressing with a tape was taken for a length of 1.3 m. The fire-resistant electric wire of Example 2 used for the characteristic test was a soft wire formed by bonding synthetic mica (fluorine-containing phlogopite) having a thickness of 0.12 mm and ceramic paper on a conductor wire having a cross-sectional area of 14 mm ^2. A synthetic synthetic mica tape is wound in layers, and an insulating wire core is formed by extruding an insulator on this soft synthetic mica tape, and then twisted together with three wire cores and inclusions, and wrapped with a holding tape. After pressing, a cable having a sheath formed by extruding and coating a non-halogen flame-retardant polyolefin was taken for a length of 1.3 m. The conventional fireproof wire used for the characteristic test is a soft natural laminated mica made by bonding 0.12 mm thick natural mica (phlogopite) and glass cloth on a conductor wire having a cross-sectional area of 14 mm ^2. After wrapping the tape over and twisting the insulation core formed by extruding an insulator on this soft natural mica tape, twist it together with the three cores and inclusions, and press it with a holding tape. A cable having a sheath formed by extrusion-coating a non-halogen flame-retardant polyolefin has a length of 1.3 m. The insulating material, the halogen-free flame-retardant polyolefin, and the thickness thereof are the same in the examples and the conventional examples.

This characteristic test was carried out by placing the refractory wire horizontally in the heating furnace in both the examples and the conventional examples, and passing both ends of this refractory wire to the inner wall surface of the heating furnace. This heating furnace is heated by a gas burner, and the furnace temperature is heated to 840 ° C. in 30 minutes according to the temperature curve defined in JIS A 1304. The heating start temperature of the sample is 200 ° C. or lower.

Table 1 Among the test conditions in the insulation resistance measurement test in Table 1,
“Before heating (MΩ · 1.3 m)” was obtained by arranging in a heating furnace and then measuring the insulation resistance value between the conductor and the fixed wire at room temperature with an insulation resistance measuring instrument of DC 500 V / 100 MΩ. The resistance value (unit is MΩ). In addition, “heating 30 minutes (MΩ · 1.3 m)” means that the insulation resistance value between the conductor and the fixed line when the temperature is raised to 840 ° C. in 30 minutes by heating in a heating furnace. It is a resistance value (unit is MΩ) obtained by measurement with an insulation resistance measuring device of 500 V / 100 MΩ.

Among the test conditions in the dielectric strength test in Table 1, "V / 1 minute before heating" means that a predetermined AC voltage is applied between the conductor and the fixed wire at room temperature for 1 minute after being placed in the heating furnace. It is to measure whether the insulation state can be maintained when applied. In addition, "V / 30 minutes during heating" means that a predetermined AC voltage is maintained between the conductor and the fixed wire from the start of heating (0 minutes) to the end of heating (30 minutes) by placing the heater in the heating furnace. Then, it is measured whether or not the insulation state can be maintained when applied. Furthermore, “V / 1 minute after heating” means that the sample is placed in a heating furnace and heated, and immediately after heating to 840 ° C. in 30 minutes to extinguish the burner fire,
It is to measure whether or not the insulation state can be maintained when a predetermined AC voltage is applied between the conductor and the fixed wire for 1 minute. Table 1
The test condition in the dielectric breakdown voltage measurement test is to measure the voltage value when dielectric breakdown occurs by further increasing the voltage after passing the dielectric strength test.

The flammability test in Table 1 was carried out when the refractory electric wire whose both ends were passed to the inner wall surface of the heating furnace was heated in the heating furnace for 30 minutes, and the temperature inside the furnace was immediately heated to 840 ° C. according to a predetermined standard. The state of combustion from the inner wall surfaces of both ends of the fire resistant wire of No. 1 was observed, and the length of combustion was displayed (unit: mm). The standards in Table 1 refer to the fire resistance certification standards established and announced by the Fire Department.

In Table 1, the insulation resistance value of the refractory wire before heating is defined by the standard to be 50 MΩ or more. The insulation resistance value before heating has a characteristic higher than the standard in each of the first and second embodiments and the conventional example. Generally, when an insulator is heated, the insulation deteriorates and the insulation resistance decreases. Therefore, in the standard, the insulation resistance value after heating (when the furnace temperature reaches 840 ° C.) is set to 0.4 MΩ or more. This insulation resistance has a characteristic higher than the standard in each of the first and second embodiments and the conventional example. However, comparing Example 1 and Example 2 with the conventional example, Example 1 has 9.5 to 12.0 MΩ, and Example 2 has 7.0 to 10.0 MΩ.
It can be seen that the characteristics are much lower than those of Examples 1 and 2, which is 3.0 to 6.0 MΩ.

Further, in the dielectric strength test of the fireproof wire, a voltage is applied between the conductor of the sample and the fixed wire to increase the voltage, and the voltage value when the dielectric breakdown occurs is measured. According to the standard of the test condition "V / 1 minute before heating", an AC voltage of 1500 V is 1 V between the conductor and the fixed wire at room temperature before heating is started.
It is required not to cause dielectric breakdown when applied for a minute. In this "V / 1 minute before heating" dielectric strength test, all of Example 1, Example 2, and the conventional example have standard characteristics. According to the test condition “V / 30 minutes during heating”, insulation is obtained when 600 V AC voltage is continuously applied between the conductor and the fixed wire from the start of heating (0 minutes) to the end of heating (30 minutes). No destruction is required. In this "V / 30 minutes during heating" dielectric strength test, all of Example 1, Example 2, and the conventional example have standard characteristics. According to the standard of "V / 1 minute after heating", the sample is placed in a heating furnace and heated, and the temperature is raised to 840 ° C in 30 minutes to extinguish the burner fire.
It is required that no dielectric breakdown occurs when an AC voltage of 00V is applied for 1 minute. This "after heating V / 1
In the dielectric strength test of “Min”, all of Example 1, Example 2 and the conventional example have standard characteristics.

The dielectric breakdown voltage of the fireproof wire is not specified in the standard, but the dielectric breakdown voltage immediately after the furnace temperature is heated to 840 ° C. according to a predetermined standard is measured and the conventional example shows 1900 to 1900. 2400V, Example 1 is 4000-4500V, Example 2 is 25
It shows a high value of 00 to 3000V. That is, both Example 1 and Example 2 have a high dielectric breakdown voltage even when exposed to high temperature, and when used in a fireproof wire, the time is longer than that of the conventional example when exposed to high temperature as compared with the conventional example. , It can be seen that the insulation state can be maintained. In addition, regarding the flammability, in the standard, the burning parts at the left and right ends of the refractory wire horizontally arranged on the left and right side wall surfaces in the heating furnace, and the left and right ends of the refractory wire are both 150 mm from the inner wall surface of the heating furnace. Up to the following places are required. Regarding this, all of the first and second embodiments and the conventional example have standard characteristics, but the right of the conventional example is 90 to 100 mm and the left is 95 to 105.
mm is 80 to 90 mm in both the left and right in Example 1, and Example 2 is
It can be seen that the right side is 80 to 90 mm and the left side is 85 to 95 mm, which is more difficult to burn (has flame retardancy) than the conventional example.

As is clear from the above-mentioned characteristic test of the fireproof wire, the fireproof certification standard set by the Fire Department is satisfied in all of the examples 1, 2 and the conventional example, but the high temperature which is the most important as the fireproof wire is satisfied. Example 1 compared to the conventional example in that the decrease in insulation resistance when exposed to (flame) is small, the decrease in insulation breakdown voltage when exposed to high temperature (flame) is small, and the flame retardancy is high. It can be seen that Example 2 is far superior.

[0027]

According to the invention of claim 1, the standard of the fire resistance test (heating for 30 minutes according to the fire temperature curve of JIS A1304) according to the Notification No. 3 of the Fire Service Agency (after being exposed to a fire, the fire resistance is 30 Insulation is maintained for a longer period of time than that in which the insulation is maintained), and stable power supply can be performed.

According to the second aspect of the present invention, a synthetic mica (fluorine-containing phlogopite) is used for the refractory layer, and a tape using an inorganic material such as glass or ceramic for the presser winding, or a heat insulating property such as a paper tape. By using the tape having, it is possible to maintain the insulating performance for a longer period of time than before.

According to the third aspect of the present invention, the conventional refractory layer can be reinforced and the insulation can be maintained even when exposed to a flame for a long time.

According to the fourth aspect of the present invention, the conventional refractory layer can be reinforced and the insulation can be maintained even when exposed to flame for a long time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a fireproof electric wire according to the present invention.

FIG. 2 is a view showing a state in which a laminated mica tape is wound around the conductor shown in FIG.

FIG. 3 is a cross-sectional view of a mica tape assembled on the conductor shown in FIG.

FIG. 4 is a cross-sectional view showing another embodiment of the laminated mica tape for a fireproof electric wire according to the present invention.

FIG. 5 is a cross-sectional view showing the structure of a conventional fireproof wire.

6 is a view showing the structure of the conventional laminated mica tape shown in FIG.

FIG. 7 is a diagram showing a specific configuration of the conventional laminated mica tape shown in FIG.

8 is a diagram showing a specific structure of the conventional laminated mica tape shown in FIG.

9 is a diagram showing a specific configuration of the conventional laminated mica tape shown in FIG.

[Explanation of symbols]

1 …………………………………………………… Fireproof wire 2 …………………………………………………… Conductor 3 ……………… ……………………………………… Assembled mica 4,16,19 ……………………………… Backing material 5 ………………………………………… …………… Natural laminated mica tape 6 …………………………………………………… Fireproof layer 7 …………………………………………………… Insulator 8, 20 ………………………………………… Insulation wire core 9 …………………………………………………… Inclusion 10 …… ………………………………………… Presser foot tape 11 ……………………………………………… Sheath layer 12 ………………………… …………………………… Polyethylene film 13 ……………………………………………… Polypropylene film 1 4 …………………………………………………… Glass cloth 15 ……………………………………………… Synthetic mica 17 …………………… ………………………………… Synthetic laminated mica tape 18 ……………………………………………… Polyester tape

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[Procedure amendment]

[Submission date] August 10, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

According to the second aspect of the present invention, a soft synthetic laminated mica (fluorinated phlogopite) having a thickness of 0.09 to 0.15 mm and a film such as PE or PP or a backing made of glass cloth is formed on the conductor. 2-4 sheets of laminated mica tape, which is laminated with materials, is wrapped by 1 / 2-1 / 10 wrapping or vertical attachment, and after forming a fireproof layer, extruded and covered with an insulator made of polyolefin to form an insulated wire core. To do. Then, after twisting a plurality of this insulated wire core together with paper, jute, and PP defibrated yarn, wind a presser-wrapping tape, or after applying a presser-wrapping tape on the insulated wire core, if necessary A sheath layer is formed by extrusion of a combustible polyolefin or polyvinyl chloride. Unlike the conventional polyester non-woven fabric, nylon non-woven fabric, polypropylene, and polyester tape, glass tape, paper tape, and ceramics paper are used for this press-wrap tape. Therefore, the conventional fire-resistant layer is strengthened, and even if it is exposed to flame for a long time, it maintains insulation and can supply power stably. When fire resistance test is performed according to the fire temperature curve of JIS A1304, It can withstand heating for a time (normal temperature to 925 ° C.).

Claims (4)

[Claims] 1. An integrated mica tape in which a synthetic mica is laminated with a backing material on a conductor to be integrated, and one or a plurality of the integrated mica tapes are wound in a 1/2 to 1/10 wrap or vertically, and the integrated mica tape is obtained. A fireproof electric wire, characterized in that an insulator made of polyolefin is extruded and covered on the top of the fireproof electric wire. 2. An integrated mica tape in which a synthetic mica is laminated on a conductor with a backing material to be integrated, and one or a plurality of the integrated mica tapes are wound in a 1/2 to 1/10 wrap or vertically and the integrated mica tape is formed. An insulating wire core is extruded and coated on the above to form an insulating wire core, and the insulating wire core is twisted together with a plurality of inclusions, and is wound with a glass tape, paper tape or ceramics paper, and a halogen-free flame-retardant polyolefin or A refractory electric wire characterized in that a sheath layer is formed by extruding polyvinyl chloride. 3. The laminated mica tape has a thickness of 0.09.
The fireproof electric wire according to claim 1 or 2, wherein a synthetic mica having a diameter of 0.1 mm to 0.15 mm and a backing material made of a synthetic resin tape or glass cloth are bonded and integrated. 4. The fire resistant electric wire according to claim 3, wherein the synthetic mica is made of fluorinated phlogopite.