**Exhibit 31.02****CERTIFICATION**I, Jacques M. Croisetiere, Executive Vice President and Chief Financial Officer of Rohm and HaasCompany, certify that:1. I have reviewed this report on Form 10-K of Rohm and Haas Company; 2. Based on my knowledge, this report does not contain any untruestatement of a material fact or omit to state a material factnecessary to make the statements made, in light of thecircumstances under which such statements were made, notmisleading with respect to the period covered by this report; 3. Based on my knowledge, the financial statements, and otherfinancial information included in this report, fairly present inall material respects the financial condition, results ofoperations and cash flows of Rohm and Haas as of, and for, theperiods presented in this report; 4. Rohm and Haas’ other certifying officer(s) and I are responsiblefor establishing and maintaining disclosure controls andprocedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) and internal control over financial reporting (asdefined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for Rohmand Haas and have:(a) Designed such disclosure controls and procedures, or caused such disclosurecontrols and procedures to be designed under our supervision, to ensure that materialinformation relating to Rohm and Haas, including its consolidated subsidiaries, is madeknown to us by others within those entities, particularly during the period in which thisreport is being prepared;(b) Designed such internal control over financial reporting, or caused such internal controlover financial reporting to be designed under our supervision, to provide reasonableassurance regarding the reliability of financial reporting and the preparation of financialstatements for external purposes in accordance with generally accepted accountingprinciples;(c) Evaluated the effectiveness of the Rohm and Haas’ disclosure controls and procedures andpresented in this report our conclusions about the effectiveness of the disclosure controlsand procedures, as of the end of the period covered by this report based on such evaluation;and(d) Disclosed in this report any change in Rohm and Haas’ internal control over financialreporting that occurred during Rohm and Haas’ most recent fiscal quarter (Rohm and Haas’fourth fiscal quarter in the case of an annual report) that has materially affected, or isreasonably likely to materially affect, Rohm and Haas’ internal control over financialreporting; and5. Rohm and Haas’ other certifying officer(s) and I have disclosed, basedon our most recent evaluation of internal control over financialreporting, to Rohm and Haas’ auditors and the audit committee of Rohmand Haas’ board of directors (or persons performing the equivalentfunctions):(a) All significant deficiencies and material weaknesses in the design or operation ofinternal control over financial reporting which are reasonably likely to adversely affectRohm and Haas’ ability to record, process, summarize and report financial information; and(b) Any fraud, whether or not material, that involves management or other employees who havea significant role in Rohm and Haas’ internal control over financial reporting.Date: February 28, 2007       */s/ Jacques M. Croisetiere* Jacques M. Croisetiere      Executive Vice-President and Chief    Financial Officer  
121