& nbsp; & nbsp; & nbsp; Silicone fireproof sealant is used for building doors, windows, and curtain walls to prevent frequent fires in high-rise buildings. The sealing of building doors, windows, and curtain walls is an effective measure to prevent the continuous expansion of fires. Based on the principle of high-temperature ceramicization, a fireproof sealant for building doors, windows, and curtain walls has been prepared, which has low smoke emission, low smoke toxicity, and can maintain structural integrity and thermal insulation even after continuous combustion at 1000 ℃ for 3 hours. R999 fireproof sealant has passed strict audits by certification agencies.
 
With the continuous advancement of urbanization in our country, high-rise buildings have sprung up like mushrooms after rain, becoming one of the symbols of urban modernization. However, in recent years, the frequent occurrence of fires in high-rise buildings has sounded the alarm for people due to their high floors, large volume, large number of personnel, complex functions, and much higher fire hazards than ordinary buildings. According to the "Code for Fire Protection Design of Buildings", fire prevention measures should be taken at the outer edge of each floor slab, and the gaps between the curtain wall and each floor slab and partition wall should be sealed with fireproof sealing materials. The evacuation doors and windows in the stairwell should be equipped with Class B or above fire-resistant doors and windows. The fire-resistant doors and windows must meet the insulation and integrity requirements for 1 hour under fire conditions to ensure the evacuation of personnel. Therefore, the fire prevention issue of buildings mainly considers two aspects: the fire prevention of the building itself (non flammability); How to prevent the spread of fire in building components.
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Introduction to Silicone Fire Sealing Adhesive Technology



The main components of fire-resistant door and window systems refer to fire-resistant glass and frame systems. According to their fire resistance performance, they are divided into two types: A-grade insulation and C-grade non insulation. A-grade fireproof doors and windows meet both fire integrity and fire insulation requirements, while C-grade fireproof doors and windows only meet fire integrity requirements and do not require fire insulation. According to different fire resistance limits, Class A insulation is divided into five levels: A3.00, A2.00, A1.50 (Class A), A1.00 (Class B), and A0.50 (Class C); C-level non insulated fireproof doors and windows are divided into five levels: C3.00, C2.00, C1.50, C1.00, and C0.50< br />


There are not many fireproof doors and windows in general buildings, and they are only used in fire compartments such as corridors. The vast majority of doors and windows in the market that require fire resistance are made of single piece fire-resistant glass. Composite fire-resistant glass is a type of fire-resistant material injected into the middle of ordinary fire-resistant glass. When this material is exposed to fire, the outer layer of glass will break, and the middle material will rapidly expand to protect the inner glass, so the effect is very good. However, due to some issues with the insulation and durability of composite fire-resistant glass, it is usually used on indoor fire-resistant doors. In addition to window glass, profiles also affect the fire resistance of doors and windows. Among the commonly used profiles, steel and wood profiles perform well in testing, while plastic and aluminum alloy windows will melt or even carbonize over time. Therefore, fire-resistant windows often use some special techniques, such as using insulated aluminum alloy profiles to connect the indoor and outdoor sides with steel on the profiles, and then setting up some fixtures to clamp the glass. This way, even if the glass softens, it will not collapse and can continue to function on the plane of the window. [4]



Performance of silicone fireproof sealant



Building curtain walls are composed of supporting structural systems and panels, which can be divided into glass curtain walls, metal curtain walls (stainless steel, aluminum alloy), stone curtain walls, etc. according to the different panel materials. Building curtain walls are generally used on the exterior walls of densely populated public buildings or important high-rise and super high-rise buildings, with a high risk of fire. Due to the requirements of building construction, there are large gaps between curtain walls and floor slabs, as well as between curtain walls, which require fireproof sealing treatment. If left untreated or mishandled, at the beginning of a fire, thick smoke has already spread upwards through the crack, and flames can climb up to the previous floor through this crack. When the curtain wall cracks and falls, the fire spreads from the outside of the curtain wall to the upper wall, burning the upper curtain wall and then entering the upper interior. In order to improve the fire resistance limit of the curtain wall, extend the time for the curtain wall to resist fires, prevent the spread of smoke and fire during fires, and minimize the losses caused by fires. The gaps between the curtain wall and its surrounding fireproof partition components, the gaps between the outer edge of the floor or partition wall, the gaps between the edge of the solid wall opening, as well as the gaps in pipeline shafts, elevator shafts, etc., should all be designed for fireproof sealing.
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Partial height with wall: For parts with wall height, fireproof sealing should be carried out at the floor and window openings. For parts without wall height, a fireproof layer should be installed on the lining board (the fixing method of the fireproof layer should ensure that it will not fall off in a fire). The gap between the partition wall and the fireproof layer should be fireproof sealed. Full height without walls: The fireproof layer should be installed on the lining board (the fixing method of the fireproof layer should ensure that it will not fall off in a fire). Fireproof sealing should be carried out at the floor level, and the gap between the partition wall and the fireproof floor should be sealed for fire prevention. Glass curtain wall: The lower part of the window wall is equipped with a fire-resistant layer (fire-resistant glass fire-resistant layer) at the upper part, and the wall between windows should be equipped with a fire-resistant layer on the lining board (the method of fixing the fire-resistant layer should ensure that it will not fall off in a fire). The non wall part should be equipped with a fire-resistant layer on the lining board (the method of fixing the fire-resistant layer should ensure that it will not fall off in a fire). The width of the gap between the partition wall and the fireproof layer shall not be less than 10.2m fireproof sealing< br />


The difference between fire prevention and flame retardancy



At present, there are also many manufacturers on the market promoting flame-retardant silicone sealants. There are significant differences in testing methods and performance between fire-resistant adhesives and flame-retardant adhesives. Most of these sealants comply with the standard GB/T 24267; 2009 "Flame retardant sealant for construction". This standard refers to GB/T2408-2008 "Horizontal and Vertical Methods for Determination of Plastic Combustion Performance" in the determination of combustion performance. Based on the combustion time (including flame combustion and flameless combustion) and combustion rate of the specimen, the combustion performance of the sealant is divided into four levels: V0, V1, V2, and HB. The combustion performance of flame-retardant sealant meets the V0 level, requiring that the combustion material does not drip within 10 seconds of the first vertical combustion, and the residual flame time and afterglow time after leaving the flame are both≤ 10 seconds, and the residual flame afterglow time after the second combustion; 30 seconds. According to this test method, only the flame retardant performance of the sealant itself after applying flames was judged and classified, without involving the key considerations of fire integrity and fire insulation in real fire situations. Once a fire occurs, it only takes about 10 minutes for the temperature to rise above 600 ℃. At such high temperatures, typical flame retardant sealants will quickly degrade, losing their original strength and elasticity. No matter how good their flame retardancy is, the sealant itself will not burn, but eventually it will still undergo ashing like ordinary sealants, losing its supporting and sealing function. [3]



In fact, GB/T 24267— The 2009 standard also states that '; When used for fire sealing engineering, it should also comply with GB 23864— The 2009 standard requirements for fireproof sealing materials;. GB 23864— The 2009 standard follows GB/T 99781-2009 "Methods for Fire Resistance Testing of Building Components Part 1: General Requirements" is a complete simulation of the actual fire situation of the specimen in the event of a fire, focusing on the fire resistance insulation and integrity of the specimen after being tested for 1 hour, 2 hours, and 3 hours in a specified fire resistance test furnace, with the highest level being 3 hours of fire resistance. Maintaining integrity requires that the adhesive joints do not collapse, have no cracks, and no flames penetrate; The requirement for maintaining thermal insulation is that the temperature rise of the back fire surface of the fireproof sealant should be less than or equal to; 180 ℃< br />


In addition to complying with the GB/T standard for flame retardant sealants used in buildings, fire-resistant adhesive also meets the requirements of GB 23864; The 2009 standard for fireproof sealing materials requires that after burning at 1000 ℃, the integrity and thermal insulation of building components are maintained< br />


Introduction to R999 fireproof sealant



R999 silicone fire sealant is a single component sealant with neutral curing. In addition to the advantages of ordinary silicone sealant such as weather resistance, high temperature resistance, and good adhesion, it also has excellent flame retardant and fire resistance properties. The flame retardant performance reaches the highest level V0 of GB/T2408-2008 standard, and the fire resistance performance reaches the highest level A3 of GB/T 23864-2009 standard (fire resistance of 1000 ℃ * 3 hours). See Figure 2 for the situation of the test specimens before and after the fire resistance test. The highest temperature rise on the back of the test specimen is 60 ℃, far below the standard requirement of 180 ℃. During combustion, no toxic gas is released and the smoke emission is low.
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The biggest advantage of R999 silicone fire sealant is that after high-temperature combustion, the colloidal organic matter decomposes and forms a ceramic structure at high temperatures. As shown in Figure 1, after combustion, the colloid does not pulverize, shrink, slightly expand, and has a hard sintered product, maintaining the stability of the size behind the combustion wall< br />


R999 silicone fire sealant must be used to seal the gaps, door and window seals, and pipe holes in building doors, windows, and curtain walls with fire-resistant sealing materials. Antai DJ-A3-AT178 is a fireproof sealant designed using the principle of high-temperature ceramicization. During the sealing process, it not only maintains the integrity of the specimen structure, but also has a back fire surface temperature of only 60 ℃, which is much lower than the standard; The requirement is 180 ℃< br />