Ceramic refractory silicone rubber 13170, 13670
Product description
Ceramic fire-resistant silicone rubber is a new composite material which can be vitrified at high temperature. Fire resistant silicone rubber is quickly burned into a hard and complete shell at the temperature of 500-1000 ℃, which ensures that the wires and cables will not be damaged in case of fire, and plays a solid protective role in the smooth flow of power and communication. Ceramic fire-resistant silicone rubber can replace mica tape as fire-resistant layer of fire-resistant cable. In particular, the medium and low voltage fire-resistant wire and cable can not only be used as fire-resistant layer, but also as insulation layer at the same time.
Main characteristics
1 The self-supporting ceramic body is formed in the flame.
When the rubber material containing inorganic fillers is exposed to the flame, the rubber will degrade or burn. After the degradation or combustion products volatilize, the inorganic residue or ash with lower strength will be left. These residues are usually not agglomerated or self-supporting, or even broken into particles or powders, so they have no fireproof effect. When the ceramic rubber with special design formula is exposed to the flame, depending on the rubber variety and formula adjustment, the ceramic can be produced in the range of 500 ~ 800 ℃ or above, and sintered into porous self-supporting ceramic body. The structural integrity can be maintained within a certain time (0.5 ~2h), which can play a good role in "passive fire prevention" and win valuable time for fire safety.
2 It has certain strength and good thermal shock resistance.
The sintered body after vitrification is relatively hard, there is ceramic sound when knocking, and it has certain bending strength and press through strength. The bending strength of the ceramic silicone rubber is much higher than that of the ordinary silicone rubber, and it increases obviously with the increase of temperature. The sample with high temperature ablation was sprayed with water during the simulation of fire fighting process, and the results show that the sintered body of the ceramicized silicone rubber does not crack and shows good thermal shock resistance.
3 Halogen free, low smoke, low toxicity, self extinguishing, environmental protection.
The ceramic silicone rubber can achieve the effect of flame retardant and self extinguishing without adding halogen flame retardant. The flame retardant UL94V-0. Under the ablation of the flame, the smoke will be completely cut off after being burned for a few minutes, and no smoke will be generated in the next ablation process. Carbon dioxide, water and silicon dioxide produced by combustion of ceramic silicone rubber are non-toxic substances.
4 Good electrical performance.
The electrical properties of the optimized ceramic silicone rubber the volume resistivity before sintering is not less than 1015 Ω• With the increase of sintering temperature, the volume resistivity decreases. After burning at 1000 ℃ for 30 min, the volume resistivity decreases to 107 Ω• cm.
5 Easy to process.
The production equipment of ceramic silicone rubber compound is the same as that of ordinary silicone rubber. The compound has good extrusion performance and molding performance. It can be directly extruded and vulcanized into wires and cables with silicone rubber wire and cable equipment without additional equipment. The production process of fire-resistant cable is simplified and the cost is reduced.
Main applications
It is mainly used in the production of fire resistant wires and cables. The fire-resistant wires and cables can ensure the smooth of power and communication lines in case of fire; The performance index of gb/t19216 has been reached, that is, under the condition of loading 0.6/1kv, temperature above 950 ℃ and flame erosion for more than 90min, it is not short circuit or open circuit, thus ensuring the smooth of the line, saving the lives and property of personnel and winning the time to the maximum extent.
Because of the excellent characteristics of refractory silica gel, the wire and cable produced by it are widely used. For example: hospitals, cinemas, commercial buildings, subway, tunnels, railways, airports, stations, large public sports, entertainment places, large supermarkets, hotel and other crowded places; The requirements of power and communication facilities such as television station, military facilities, nuclear power station are relatively strict; Coal, chemical industry, medicine, steel, metallurgy, ship and other industries with bad external environment.
Typical product data
| Test Items | Test standard | LS13170 | LS13670 |
| Appearance | Greyish white | Greyish white | |
| Density（g/cm3） ±0.02 | GB/T 531.1-2008 | 1.44 | 1.44 |
| Hardness (Shore A) ±5 | GB/T 531.1-2008 | 70 | 70 |
| Tensile strength(MPa) ≥ | GB/T 528-2009 | 6 | 7 |
| Elongation (%) ≥ | GB/T 528-2009 | 200 | 240 |
| Tear strength (KN/m) ≥ | GB/T 529-2008 | 15 | 21 |
| Volume resistivity(Ω.cm) | GB/T 1692-2008 | 1 × 1014 | 1 × 1015 |
| Breakdown strength（KV/mm） | GB/T 1695-2005 | 20 | 22 |
| Dielectric constant | IEC 60250 | 3.3 | 3.3 |
| Dielectric loss angle | IEC 60250 | 2×10-3 | 2×10-3 |
| Arc resistance (sec) | IEC 61621 | ≥350 | ≥350 |
| Resistance to electric leakage and scratch class | IEC 60587 | 1A3.5 | 1A3.5 |
| oxygen index | GB/T 10707-2008 | 29 | 33 |
| Smoke toxicity | GB/T 20285 | ZA1 | ZA1 |
| Note: 1. Curing condition: curing at 170 degrees Celsius for 5 minutes, the proportion of the DHBP is 1.2%, and by compression molding to make the test sheet; 2. Different vulcanizing agents, different testing conditions, data will be different; 3. The above physical property data are for reference only. If you need the inspection report of the goods, please ask the sales office for it. | |||
Usage and operation
1. Open the mill for about 3-5 minutes to make the rubber roll and mix evenly.
2. Then add the color paste to make it even (if necessary), and then add the curing agent. Roll 10 to 15 rolls to make the curing agent evenly dispersed in the rubber, and the rubber surface becomes smooth.
3. After the rubber is rolled down, it forms a sheet. Each piece is separated by a membrane.
If it is hot curing, it is recommended to add bis (2,4-sulfurizer). Dosage: 1% of glue weight.
If it is continuous or die pressed, it is recommended to add double five-year vulcanizing agent. Dosage: 1-1.2% of the glue weight.
The curing temperature is 170 ℃ - 350 ℃. The specific setting depends on the equipment, extrusion speed and product specifications.
Safety and Storage
* The normal temperature shelf life of silica gel is 12 months. It is recommended to use it within 3 months. If it is beyond 3 months, the mixing time of the product will be extended.
* Store in a dry and cool place, avoid direct sunlight.
* Store in a dry and cool place, away from direct sunlight.
* Keep out of reach of children.
Packing
* Packed in 20kg cartons lined with plastic bags. Please store in a cool place.
Industrial Instructions
- The user is obliged to know the applicable scope and use of the product.
- Our inspection report is only based on the vulcanization conditions and inspection methods of Dongguan Longsun Material Technology Co., Ltd. It can not be used as the standard of silicone rubber compound products of Dongguan Longsun Material Technology Co., Ltd. and can not be used as the basis for customers to accept the products of Dongguan Longsun Material Technology Co., Ltd.
- Due to the different production conditions, we can not guarantee that both parties can get the same test results. It is suggested that the data tested under their own test conditions can be used as a reference for performance.
- Any of the above performance data and applicable suggestions are only a reference for the use performance of products of Dongguan Longsun Material Technology Co., Ltd., not a guarantee for the effectiveness or universality of Dongguan Longsun Material Technology Co., Ltd. in specific applications.
- We reserve the right to change the product data without prior notice.
Performance Test of Ceramic Fire-Resistant Silicone Rubber Used in Fire-Resistant Wire and Cable
Key words:
Ceramifiable Silicone Rubber (Extrusion/Molding)
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