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B级外墙保温材料燃烧等级划分
发布时间:2021-08-27    发布人:富美家防火板小编   网址:https://www.zhumeiyike.com/   点击:
B级的保温材料,又可分为三个等级,其中B1级是难燃,B2级是可燃,B3级是易燃。B1级属于难燃保温材料,比较常见的是经过特殊处理加了阻燃剂的EPS/XPS保温板等。难燃类材料有较好的阻燃作用。其在空气中遇明火或在高温作用下难起火,不易发生蔓延,且当火源移开后燃烧立即停止。
Class B thermal insulation materials can be divided into three grades, among which Class B1 is flame retardant, class B2 is combustible and class B3 is flammable. Class B1 belongs to flame retardant insulation material, and EPS / XPS insulation board with special treatment and flame retardant is more common. Flame retardant materials have good flame retardancy. In case of open fire in the air or under the action of high temperature, it is difficult to catch fire and is not easy to spread, and the combustion stops immediately after the fire source is removed.
B2级是可燃保温材料,多见为苯板、挤塑板聚氨酯、普通真金板等。这种材料燃点低,并在燃烧过程中会释放大量有害气体。虽然可燃类材料有一定的阻燃作用,但在空气中遇明火或在高温作用下会立即起火燃烧,易导致火灾的蔓延,如木柱、木屋架、木梁、木楼梯等。B3级是易燃保温材料,多见为聚苯泡沫为主材料的保温材料。无任何阻燃效果,极易燃烧,火灾危险性很大。
Class B2 is combustible thermal insulation material, which is mostly benzene board, extruded board, polyurethane, ordinary real gold board, etc. This material has a low ignition point and will release a large number of harmful gases during combustion. Although combustible materials have a certain flame retardant effect, they will catch fire immediately in case of open fire in the air or under the action of high temperature, which is easy to lead to the spread of fire, such as wooden columns, wooden roof frames, wooden beams, wooden stairs, etc. Grade B3 is a flammable thermal insulation material, mostly polystyrene foam material as the main insulation material. Without any flame retardant effect, it is very easy to burn and has great fire risk.
(1)当建筑的外墙外保温系统采用燃烧性能为B1、B2级的保温材料时,应符合下列规定:除采用B1级保温材料且建筑高度不大于24m的公共建筑或采用B1级保温材料且建筑高度不大于27m的住宅建筑外,建筑外墙上门、窗的耐火完整性不应低于0.50h。应在保温系统中每层设置水平防火隔离带。防火隔离带应采用燃烧性能为A级的材料,防火隔离带的高度不应小于300mm。
A级防火不燃板
(1) When the exterior wall external insulation system of the building adopts thermal insulation materials with combustion performance of grade B1 and B2, it shall comply with the following provisions: except for public buildings with grade B1 thermal insulation materials and building height of no more than 24m or residential buildings with grade B1 thermal insulation materials and building height of no more than 27m, the fire resistance integrity of exterior wall doors and windows shall not be less than 0.50h. Each layer of the insulation system shall be provided with a horizontal fire isolation belt. The fireproof isolation belt shall be made of materials with class a combustion performance, and the height of the fireproof isolation belt shall not be less than 300mm.
(2)建筑的外墙外保温系统应采用不燃材料在其表面设置防护层,防护层应将保温材料完全包覆。
(2) The external thermal insulation system of the external wall of the building shall adopt incombustible materials, and a protective layer shall be set on its surface, which shall completely cover the thermal insulation materials.
(3)建筑外墙的装饰层应采用燃烧性能为A级的材料,但建筑高度不大于50m时,可采用B1级材料。
(3) The decorative layer of the external wall of the building shall be made of materials with class a combustion performance, but Class B1 materials can be used when the building height is not greater than 50m.
(4)建筑的屋面外保温系统,当屋面板的耐火极限不低于1.00h时,保温材料的燃烧性能不应低于B2级;当屋面板的耐火极限低于1.00h时,不应低于B1级。采用B1、B2级保温材料的外保温系统应采用不燃材料作防护层,防护层的厚度不应小于10mm。当建筑的屋面和外墙外保温系统均采用B1、B2级保温材料时,屋面与外墙之间应采用宽度不小于500mm的不燃材料设置防火隔离带进行分隔.
(4) For the external thermal insulation system of the building roof, when the fire resistance limit of the roof panel is not less than 1.00h, the combustion performance of the thermal insulation material shall not be lower than grade B2; When the fire resistance limit of roof slab is lower than 1.00h, it shall not be lower than grade B1. The external insulation system with B1 and B2 thermal insulation materials shall use incombustible materials as the protective layer, and the thickness of the protective layer shall not be less than 10mm. When B1 and B2 thermal insulation materials are used for the roof and external wall external insulation system of the building, non combustible materials with a width of not less than 500mm shall be used between the roof and external wall, and fireproof isolation belt shall be set for separation
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