**Exhibit31.2**

 

**CERTIFICATIONS**

 

I, Robert J. Zatta, certify that:

 

1.            I have reviewed this quarterly report on Form10-Q of Rockwood SpecialtiesGroup, Inc.;

 

2.            Based on my knowledge, this report does not contain any untrue statement of amaterial fact or omit to state a material fact necessary to make the statementsmade, in light of the circumstances 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 other financialinformation included in this report, fairly present in all material respectsthe financial condition, results of operations and cash flows of the registrantas of, and for, the periods presented in this report;

 

4.            The registrant’s other certifying officer(s)and I are responsible forestablishing and maintaining disclosure controls and procedures (as defined inExchange Act Rules13a-15(e)and 15d-15(e)) for the registrant and have:

 

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

 

(b)          Designed such internal control over financial reporting, or caused suchinternal control over financial reporting, to be designed under oursupervision, to provide reasonable assurance regarding the reliability offinancial reporting and the preparation of financial statements for externalpurposes in accordance with generally accepted accounting principles;

 

(c)           Evaluatedthe effectiveness of the registrant’s disclosure controls and procedures andpresented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by thisreport based on such evaluation; and

 

(d)          Disclosed in this report any change in the registrant’s internal control overfinancial reporting that occurred during the registrant’s most recent fiscalquarter that has materially affected, or is reasonably likely to materiallyaffect, the registrant’s internal control over financial reporting;

 

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

 

(a)           Allsignificant deficiencies and material weaknesses in the design or operation ofinternal control over financial reporting which are reasonably likely toadversely affect the registrant’s ability to record, process, summarize andreport financial information; and

 

(b)           Anyfraud, whether or not material, that involves management or other employees whohave a significant role in the registrant’s internal control over financialreporting.

 

 
| Date: August 11, 2008                             |   |
|---------------------------------------------------|--------|
|                                              |   |
| /s/ ROBERT J. ZATTA                          |   |
| Robert J. Zatta                                   |   |
| Senior Vice President and Chief Financial Officer |   |

 

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