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Classification in accordance with Consumer Product Safety Commission (CPSC)
Class 1
These textiles are considered by the trade to generally acceptable for apparel and are limited to the following:
Textiles that do not have a raised fiber surface but have an average time of flame spread in the test of 3.5 s or more.
Textiles having a raised fiber surface that have an average time of flame spread in the test of more than 7 s or that
burn with a surface flash (time of flame spread less than 7 s), provided the intensity of the flame is insufficient to ignite, char melt the base fabric. Textiles for which no specimen ignites.
Class 2
These textiles are considered by the trade to have flammability characteristics for apparel intermediate between
Class I and Class III fabrics and are limited to the following:
Textiles having a raised fiber surface that have an average time of flame spread in the test of 4 to 7 s, inclusive,
and in which the base fabric is ignited, charred or melted.
Class 3
These textiles are considered by the trade to unsuitable for apparel and are limited to the following:
Textiles that do not have a raised fiber surface that have an average time of flame spread in the test of less than 3.5
Textiles having a raised fiber surface that have an average time of flame spread in the test of less than 4 s, and in
which the base fabric is ignited, charred, or melted.