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ASTME 84 versus CPAI-84- What's the difference?

Posted by Nana Hinsley on Thu, Dec 15, 2011 @ 02:54

Question:  What is the difference between ASTME 84 and CPAI-84?

Answer:  ASTM E-84 measures the flame spread and smoke index, which are considered the surface burning characteristics of a material.  Depending on the numbers, materials can have classifications of Class A, B, or C according to NFPA , ANSI/NFPA No. 101, "life Safety Code" , 2006 Edition, or IBC (International Building Code), 2006 Edition, Chapter 8, Interior Finishes, Section 803,  if they pass any level of this standard.  The test is conducted in a fire tunnel using a 22" x 24' sample of the material.  The ignition source is 7 seconds in duration, total test is 10 minutes.  The flame front cannot exceed 24" during the test.  Results are expressed as Flame Spread Index, and Smoke Developed Value.

CPAI-84 does not measue flame spread. It measures the char length and mass lost as well afterflame.  CPAI-84 does not insure that a fabric is flame retardant.  It is a test method for evaluating the flame resistance of fabrics and other materials such as plastic sheeting.