POWER OF ATTORNEY
FOR EXECUTING FORMS 3, 4 AND 5

	Know all by these presents, that the undersigned hereby
constitutes and appoints each of J. Mark Hollingsworth, Robert D.
Graham, A. Andrew R. Louis, and Andrew B. Nace signing singly, his/her
true and lawful attorney-in-fact to:

(1)	execute for and on behalf of the undersigned Forms 3, 4 and 5 in
accordance with Section 16(a) of the Securities Exchange Act of 1934,
as amended (the "Act"), and the rules thereunder;

(2)	do and perform any and all acts for and on behalf of the
undersigned that may be necessary or desirable to complete the
execution of any such Forms 3, 4 or 5 and the timely filing of such
form with the United States Securities and Exchange Commission and any
other authority; and

(3)	take any other action of any type whatsoever in connection with
the foregoing that in the opinion of such attorney-in-fact may be of
benefit to, in the best interest of, or legally required by, the
undersigned, it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to this power of
attorney shall be in such form and shall contain such terms and
conditions as such attorney-in-fact may approve in his/her discretion.

	The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and thing
whatsoever requisite, necessary and proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all intents
and purposes as the undersigned might or could do if personally
present, with full power of substitution or revocation, hereby
ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or
cause to be done by virtue of this power of attorney and the rights and
powers herein granted.  The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving such capacity at the request of the
undersigned, are not assuming any of the undersigned's responsibilities
to comply with Section 16 of the Act.

	This power of attorney shall remain in full force and effect
until the undersigned is no longer required to file forms 3, 4 or 5
unless earlier revoked by the undersigned in a signed writing delivered
to the foregoing attorneys-in-fact.

	EXECUTED as of this 23rd day of May 2006.


/s/ Paul J. Zucconi
Signature

Paul J. Zucconi
Printed Name