GENERAL BUILDING CLASSIFICATIONS

Buildings enumerated in sections 4—8 of the Dry Cleaning and Dyeing Law (35 P.S. § § 1269.4—1269.8) shall be classified as follows:

1. (1) Class I. The buildings in this class use class I solvent which is a flammable petroleum solvent having the following properties:

   Flash point (closed cup tester)	Lower than 100 °F.

2. (2) Class II. The buildings in this class use class II solvent which is a flammable petroleum solvent having the following properties:

   Flash point (closed cup tester)	Lower than 138.2° F. but higher than 99° F.
   Initial boiling point	Lower than 357.8° F. but higher than 300° F.
   Ignition temperature	Lower than 453.2° F. but higher than 400° F.
   Power limit of explosive range	Not less than 1.1% by volume of air.
   Spontaneous heating	The solvent shall not heat spontaneously.

3. (3) Class III. The buildings in this class use class III solvent which is a flammable petroleum solvent having the following properties:

   Flash point (closed cup tester)	Not lower than 138.2° F.
   Initial boiling point	Not lower than 357.8° F.
   Ignition temperature	Not lower than 453.2° F.
   Power limit of explosive range	Not less than 0.8% by volume in air at an initial temperature of 302° F.
   Spontaneous heating	The solvent shall not heat spontaneously.

4. (4) Class IV. The buildings in this class use Class IV solvent which is a commercially nonaqueous liquid solvent that is volatile but does not contain flash point ingredients and which is neither a Class I, Class II nor a Class III solvent.