BS 4790

详情

Standard Name:
BS ***0：Method for determination of the effects of a small source of ignition on textile floor coverings (hot metal nut method)
 
Scope of application:
This British Standard describes a method for the determination of the effects of a samll source of ignition on textile floor coverings using a hot metal nut.It is applicable to all types of textile floor coverings whether loose-laid or fully adhered and used with or without an underlay.
 
Sample Requirements:
From each sample,cut at lease three test specimens each measuring **0mm×**0mm,including any backing or underlay that dorms part of the final installation,following the procedure described in BS ***4.
 
Test process:

• Test within 2 minutes of removing the specimen in the standard temperature environment of the test textile or in the atmosphere.
• Heat the nut to a temperature of **0±*0℃in the muffle furnace.
• Using the crucible tongs place the heated nut onto the specimen within 3s of its removal from the furnace.
• Open the sliding panel and remove the nut from the specimen after it has been in contact with the specimen for *0±2s,and then immediately close the sliding panel once more.