ISO 15025 Protective clothing — Protection against heat and flame — Method of test for limited flame spread

1 Scope

This International Standard specifies a method for the measurement of limited flame spread properties of vertically oriented textile fabrics and industrial products in the form of single or multi-component fabrics (coated, quilted,
multilayered, sandwich constructions, and similar combinations), when subjected to a small defined flame.

This test method is not appropriate for materials that demonstrate extensive melting or shrinkage.
2 Terms and definitions

For the purposes of this International Standard the following terms and definitions apply.

2.1 flame application time
time for which the ignition flame is applied to the test specimen

2.2 afterflame time
duration of flame
length of time for which a material continues to flame, under the specified test conditions, after the ignition source has been removed
NOTE Afterflame time is measured to the nearest second and afterflame times of less than 1,0 s should be recorded as zero.

2.3 afterglow
persistence of glowing combustion of a material under specified test conditions, after cessation of flaming or, if no flaming occurs, after removal of the ignition source

NOTE Afterglow is a continuation of combustion with the evolution of heat and light but without flame. Some materials
absorb heat during the flame application and continue to emit this absorbed heat after removal of the igniting flame. This
glowing without combustion should not be recorded as afterglow.

2.4 afterglow time
duration of afterglow
time for which a material continues to afterglow, under specified test conditions after cessation of flaming or after removal of the ignition source
NOTE Afterglow time is measured to the nearest second and afterglow times of less than 1,0 s should be recorded as
zero.

2.5 char
formation of a brittle residue when material is exposed to thermal energy

2.6 debris
material separating from the specimen during the test procedure and falling from the specimen without flaming

2.7 flaming debris
material separating from the specimen during the test procedure and igniting the filter paper

2.8 hole
surface ignition of procedure A break in the test specimen of at least 5 mm in any dimension and having a continuous perimeter caused by melting, glowing or flaming
NOTE 1 If the hole is crossed by any material it is described as discontinuous.
NOTE 2 This International Standard describes the reporting of holes in any separable layer of a multilayer specimen
obtained during suface ignition testing [see 8.2.1.3 g) and 10 i)].