34 Pa. Code § 47.321. Fabrics.

CLASSIFICATION OF FLAMMABILITY

§ 47.321. Fabrics.

Classes I, II and III include stuffed toy coverings accepted as having no unusual burning characteristics; class IV includes all coverings which are considered dangerously flammable and recognized as being unsuitable for stuffed toys because of their rapid and intense burning. The classification for fabrics shall be as follows:

No map, pile, tufting, flock, or other type raised fiber surface Napped, pile, tufted, flocked, or other type raised fiber surface

Class I (Relatively slow burning)

When time of flame spread is 20 seconds or more for 12 square inches. When time of flame spread is over seven seconds for 12 square inches.

Class II (Moderately flammable)

When time of flame spread is eight to 19 seconds for 12 square inches. Burns with a rapid surface flash in less than seven seconds for 12 square inches, with no fusing or ignition of base fabric.

Class III (Relatively flammable)

When time of flame spread is three
to seven seconds for 12 square
inches. When time of flame spread is from four to seven seconds, both inclusive, for 12 square inches with fusing or ignition of base fabric.

Class IV (Rapid and intense burning)

When time of flame spread is less
than three seconds for 12 square inches. When time of flame spread is less than four seconds for 12 square inches with fusing or ignition of base fabric.

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No map, pile, tufting, flock, or other type raised fiber surface	Napped, pile, tufted, flocked, or other type raised fiber surface
Class I (Relatively slow burning)
When time of flame spread is 20 seconds or more for 12 square inches.	When time of flame spread is over seven seconds for 12 square inches.
Class II (Moderately flammable)
When time of flame spread is eight to 19 seconds for 12 square inches.	Burns with a rapid surface flash in less than seven seconds for 12 square inches, with no fusing or ignition of base fabric.
Class III (Relatively flammable)
When time of flame spread is three to seven seconds for 12 square inches.	When time of flame spread is from four to seven seconds, both inclusive, for 12 square inches with fusing or ignition of base fabric.
Class IV (Rapid and intense burning)
When time of flame spread is less than three seconds for 12 square inches.	When time of flame spread is less than four seconds for 12 square inches with fusing or ignition of base fabric.