34 Pa. Code § 47.322
Nonfabric materials include plastics, paints, and nonfabric portions of a stuffed toy. These materials which meet the requirements in class V are accepted as having no unusual burning characteristics. Materials which have burning characteristics as set forth in class VI are considered dangerously flammable and recognized as unsuitable for stuffed toys because of their rapid burning and intense burning. The classification shall be as follows:
Class V
Such materials shall be classified as normal flammability when a nine square inch sample does not burn or flash the full area during a four second flame exposure.
Class VI
Such materials shall be classified as rapid burning when a nine square inch sample burns or flashes the full area during a four second flame exposure.
34 Pa. Code § 47.322