EXHIBIT 31.2

                                  CERTIFICATION
                                  -------------
            PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Neal E. Murphy, certify that:

   1.  I have reviewed this Quarterly Report on Form 10-Q of ISP Chemco Inc.;

   2.  Based on my knowledge, this report does not contain any untrue
       statement of a material fact or omit to state a material fact necessary
       to make the statements made, in light of the circumstances under which
       such statements were made, not misleading with respect to the period
       covered by this report;

   3.  Based on my knowledge, the financial statements, and other financial
       information included in this report, fairly present in all material
       respects the financial condition, results of operations and cash flows
       of the registrant as of, and for, the periods presented in this report;

   4.  The registrant's other certifying officer and I are responsible for
       establishing and maintaining disclosure controls and procedures (as
       defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for the
       registrant and have:


       (a) Designed such disclosure controls and procedures, or
           caused such disclosure controls and procedures to be designed
           under our supervision, to ensure that material information
           relating to the registrant, including its consolidated
           subsidiaries, is made known to us by others within those
           entities, particularly during the period in which this report
           is being prepared;


       (b) Evaluated the effectiveness of the registrant's disclosure
           controls and procedures and presented in this report our
           conclusions about the effectiveness of the disclosure controls
           and procedures, as of the end of the period covered by this
           report based on such evaluation; and


       (c) Disclosed in this report any change in the registrant's
           internal control over financial reporting that occurred during
           the registrant's most recent fiscal quarter that has
           materially affected, or is reasonably likely to materially
           affect, the registrant's internal control over financial
           reporting; and

   5.  The registrant's other certifying officer and I have disclosed, based
       on our most recent evaluation of internal control over financial
       reporting, to the registrant's auditors and the audit committee of the
       registrant's board of directors (or persons performing the equivalent
       functions):


<PAGE>

       (a) All significant deficiencies and material weaknesses in
           the design or operation of internal control over financial
           reporting which are reasonably likely to adversely affect the
           registrant's ability to record, process, summarize and report
           financial information; and


       (b) Any fraud, whether or not material, that involves
           management or other employees who have a significant role in
           the registrant's internal control over financial reporting.



Date:   November 11, 2003

        /s/ Neal E. Murphy
        ------------------
Name:   Neal E. Murphy
Title:  Senior Vice President and Chief Financial Officer