[Code of Federal Regulations]

[Title 40, Volume 29]

[Revised as of July 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR467.31]



[Page 632]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 467_ALUMINUM FORMING POINT SOURCE CATEGORY--Table of Contents

 

                     Subpart C_Extrusion Subcategory

 

Sec. 467.31  Specialized definitions.



    For the purpose of this subpart:

    (a) The ``core'' of the extrusion subcategory shall include 

extrusion die cleaning, dummy block cooling, stationary casting, 

artificial aging, annealing, degreasing, and sawing.

    (b) The term ``extrusion die cleaning'' shall mean the process by 

which the steel dies used in extrusion of aluminum are cleaned. The term 

includes a dip into a concentrated caustic bath to dissolve the aluminum 

followed by a water rinse. It also includes the use of a wet scrubber 

with the die cleaning operation.

    (c) The term ``ancillary operation'' shall mean any operation not 

previously included in the core, performed on-site, following or 

preceding the extrusion operation. The ancillary operations shall 

include direct chill casting, press or solution heat treatment, cleaning 

or etching, degassing, and extrusion press hydraulic fluid leakage.