探究BS476-4建筑材料不燃性測試BS476-4是針對建筑材料的不燃性測試，一般是針對不燃材料或者無機材料，有機材料或者塑料材料不適用，可參考標準規定的產品范圍：BS476-4不燃性測試-產品范圍：此英國標準規定了測定建筑材料是否為不燃物的測試方法。根據不燃性測試的性能結構，建筑結構和表面使用的材料被劃分為“不燃性”和“可燃性”。此測試旨在用于建筑材料，不論表面是否含有涂層，但井非用于單純的某種涂層。建筑材料做BS476-4測試怎么準備樣品呢？可參考如下樣品尺寸：須準備三個樣品，每個樣品的尺寸如下:長和寬：40mm.高：50±3mm,體積：800±50cm3關于圓柱狀厚度及其直徑的提示：如果材料的厚度小于規定的高度，每個樣品須由足夠多的樣品層疊到這個厚度。這些樣品層須平放于樣品夾內，同時須用細鐵絲綁實，避免層與層之間有間隙，但不可被壓緊。樣品的密度須能代表材料的實際密度。對于復合材料，如果按整數層疊加不能達到所需的樣品尺寸，則通過調整不同組分的厚度，使樣品中各組分的比例跟所測材料相同。如果以上兩種方式都不可行，則每種獨立的組分層都分別進行測試，分別出報告。測試前，樣品需要養護：測試前，樣品須在通風烘箱內，在60±5℃的條件下烘烤24小時，然后在含有無水氯化鈣的千燥皿內冷卻到室溫。ExploreBS476-4Non-combustibilitytestforbuildingmaterialsBS476-4isanon-combustibilitytestforbuildingmaterials,generallyfornon-combustiblematerialsorinorganicmaterials,organicmaterialsorplasticmaterialsarenotapplicable,pleaserefertotheproductrangespecifiedinthestandard:BS476-4Non-combustibilitytest-Productrange:ThisBritishstandardspecifiesthetestmethodfordeterminingwhetherbuildingmaterialsarenon-combustible.Accordingtotheperformancestructureofthenon-combustibilitytest,thematerialsusedinbuildingstructuresandsurfacesaredividedinto"non-combustible"and"combustible".Thistestisintendedforbuildingmaterials,regardlessofwhetherthesurfacecontainsacoating,butnotforasimplecoating.HowtopreparesamplesforBS476-4testofbuildingmaterials?Pleaserefertothefollowingsampledimensions:Threesamplesmustbeprepared,andthedimensionsofeachsampleareasfollows:Lengthandwidth:mHeight:50±3mm,Volume:800±50cm3Tipsoncylindricalthicknessanddiameter:Ifthethicknessofthematerialislessthanthespecifiedheight,eachsamplemustbestackedbyenoughsamplestothisthickness.Thesesamplelayersmustbeplacedflatinthesampleholderandtiedwithfinewiretoavoidgapsbetweenlayers,buttheymustnotbecompressed.Thedensityofthesamplemustrepresenttheactualdensityofthematerial.Forcompositematerials,iftherequiredsamplesizecannotbeachievedbystackingintegerlayers,thethicknessofdifferentcomponentscanbeadjustedtomaketheproportionofeachcomponentinthesamplethesameasthematerialbeingtested.Ifneitheroftheabovetwomethodsisfeasible,eachindependentcomponentlayeristestedseparatelyandreportedseparately.Beforetesting,thesampleneedstobecured:Beforetesting,thesamplemustbebakedinaventil