This standard describes a method for determining the contribution of interior finish materials to room fire growth during specified fire exposure conditions. It is intended for the evaluation of the flammability characteristics of wall and ceiling interior finish, other than textile wall coverings, where such materials constitute the exposed interior surfaces of buildings. This test is also known as the “room corner” test.

1.1* Scope. This standard describes a method for determining the contribution of interior finish materials to room fire growth during specified fire exposure conditions.
A.1.1 The performance of all wall and ceiling covering systems is addressed in this standard. Textile and expanded vinyl wall covering systems are included in this standard and they are also addressed specifically in NFPA 265, Standard Methods of Fire Tests for Evaluating Room Fire Growth Contribution of Textile or Expanded Vinyl Wall Coverings on Full Height Panels and Walls. Further information on testing of textile wall coverings can be found in Fisher et al., Room Fire Tests of TextileWall Coverings. Textile and expanded vinyl wall coverings are permitted by some codes (e.g., NFPA 101, Life Safety Code ) to be tested using NFPA 265.
1.1.1 This method is intended for the evaluation of the flammability characteristics of wall and ceiling interior finish, where such materials constitute the exposed interior surfaces of buildings.
1.1.2 This fire test method is not intended for the evaluation of fire resistance of assemblies, nor is it intended for the evaluation of the effect of fires that originate within a wall assembly.
1.1.3 This standard specifies three types of specimen mounting, depending on the application of the interior finish material, as follows: (1) Three walls (for interior finish to be used on walls only) (2) Three walls and the ceiling (for interior finish to be used on walls and ceilings) (3) The ceiling alone (for interior finish to be used on ceilings only).

Test Requirement 测试要求：

1987年美国国家标准局采用小型及大型试验，比较了几种材料的阻燃试样与未阻燃试样的火灾危险性，比较结果是：发生火灾后可供逃生时间，阻燃试样是未阻燃试样的15倍。因此目前欧美等发达国家对于材料和产品（尤其是电器、家私和建筑材料）的阻燃性能尤其重视，各国都出台了相应的强制性或建议性燃烧性能标准。

隧道试验是将测试材料的表面燃烧特性与石棉胶合板和未处理的红橡木做比较。0等级为石棉胶合板，100等级为未处理的红橡木地板材料。各种未处理的木材的火焰传播速率范围为60到230。在这个测试中，燃烧过程中产生的烟也同时被测量，并且在相同的范围内划分出其等级。这些等级在开始的10分钟内就被确定下来了。然而与防火涂层不同的是，建筑规范要求测试时间从10分钟延长到30分钟，火焰传播不能超过燃烧器10 1/2英尺，而且要求没有进一步燃烧的迹象。

NFPA 286隧道法测试设备：长7.62m，开口端横截面为0.45m*0.30m的内衬耐火砖的钢槽，槽侧有窗口。

以下几点值得注意：
1）NFPA 286主要评估的是材料或成品的火焰传播指数（FSI）和烟密度，并提供此两参数在燃烧过程中随时间变化的曲线。
2）试件至少1个 尺寸为：0.51米*7.32米* 使用最大厚度（长度不够需拼接处理）。
点燃源为2个煤气喷灯，能量输出为5.3MJ/min，位于试件之下190mm处，平行于实验室火的末端，相距305mm。试验时间为10分钟，根据试验测得FSI （flame spread index火焰传播指数）值。
3）由隧道法测定的材料的FSI值（介于0－200）及烟密度值将材料分类。高层建筑和楼道，要求FSI<25,FSI=25－100的材料只能用于防火要求不高的场所，FSI>100的材料不符合阻燃要求。标准将FSI值划分为三类:A类0－25，B类26－75，C类76－200。同时，烟指数小于450。

用该方法测定一般建筑材料的FSI，A类为0~25，B类为26~75，C类为76~200，烟指数小于450（或按照ASTM D2843测定的烟密度不大于75）。对于硬质泡沫塑料，FSI应小于等于25（或ASTM D 2843方法小于等于75），烟指数小于450。

Sample Size 样品数量 / 送样规格: on request
Lead Time / TAT (Turn Around Time) 测试周期: 常规服务 Regular service 7-9 working days

Report Summary 报告摘要: