stockcert






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ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS#                                                                                                                                                                                                                                                                             COMMON STOCK                                                                                                                                                                                                                                                                                                                                                                COMMON STOCK                                                                               PO  BOX 43004, Providence, RI 02940-3004                     ADD  4  ADD  3  ADD  2  ADD  1  DESIGNATION  (IF ANY) MR  ASAMPLE                                                                                                                                                                                                 PAR VALUE $.001                                                                                                                                                                                                            Certificate                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                Shares                                                                                                                                                                                                                Number                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         **000000******************                                                                                                                                                                                                                                                                                                                                                                                                                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                                                               ****000000****************                                                                                                                                                                                                                                                                                                                                                                                                                                          CMC MATERIALS, INC.                                                                                                                                                                                                                                                                                  *****000000***************                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               ******000000**************                                                                                                                                                                                                                                                                                                                                                                                               INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE                                                                                                                                                                                                                                                                                                                                                                                    ** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample                                                                                               SEE REVERSE FOR CERTAIN DEFINITIONS                                                                                                                                                                                                                                                                                                                                                                                   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David                                                                                                                                                                                                                                                                   THIS CERTIFIES THAT                                                                                             Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander                                                                                                                                                                                                                                                                                                                                                                                   David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.                                                                                                        CUSIP                               12571T                                     10                0                                                                                                                                                                                                                                                                                                                                                                                   Alexander David SampleMR. **** Mr. Alexander SAMPLE David Sample **** Mr. Alexander & David MRS. Sample **** Mr. Alexander SAMPLE David Sample **** Mr. Alexander &  David Sample ****                                                                                                                                                                                                                                                                                                                                                                                   Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample                                                                                                                                                                                                                                                                                                                                                                                   **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David                                                                                                                                                                                                                                                                                                                                                                                   Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander                                                                                                                                                                                                                                                                                                                                                                                   David Sample **** Mr. AlexanderMR. David  SampleSAMPLE **** Mr. Alexander David  Sample&  MRS.**** Mr. Alexander  DavidSAMPLE Sample **** Mr. Alexander David Sample **** Mr.                                                                                                                                                                                                                                                                                                                                                                                   Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample ****                                                                                                                                                                                                                                                                                                                                                                                   Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Sample **** Mr. Sample                                                                                                                                                                                                                                                                                                                                                                                     **000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares***                                                                                                                                                                                                                                                                   is the owner of                                                                                                 *000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****                                                                                                                                                                                                                                                                                                                                                                                   000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0                                                                                                        THIS CERTIFICATE IS TRANSFERABLE IN                                                                                                                                                                                                                                                                                                                                                                                   00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00                                                                                                                                                                                                                                                                                                                                                                                   0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000***ZERO HUNDRED THOUSAND000**Shares****000                                                                                 CITIES DESIGNATED BY THE TRANSFER                                                                                                                                                                                                                                                                                                                                                                                   000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0000                                                                                                                                                                                                                                                                                                                                                                                   00**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00000                                                                                                                       AGENT, AVAILABLE ONLINE AT                                                                                                                                                                                                                                                                                                                                                                                   0**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000ZERO HUNDRED AND ZERO*****Shares****000000                                                                                                         www.computershare.com                                                                                                                                                                                                                                                                                                                                                                                   **Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000*                                                                                                                                                                                                                                                                                                                                                                                   *Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**                                                                                                                                                                                                                                                                                                                                                                                   Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S                                                                                                                                                                                                                                                                                                                          FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK, $.001 PAR VALUE, OF                                                                                                                                                                                                                                                                                                                                                                                                                                                       CMC MATERIALS, INC.                                                                                      DTC       Number  of Shares Insurance  Value  Holder  ID CUSIP/IDENTIFIER   Total  Transaction 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 Certificate  Numbers                                                                                                                                                                                                                                                                    transferable in person or by duly authorized attorney upon surrender of this Certificate properly endorsed.                                                                                                                                                                                                                                                                    The shares represented hereby are issued and held subject to the laws of the State of Delaware and to the                                                                                                                                                                                                                                                                   provisions of the Certificate of Incorporation and the Bylaws of the Corporation as now or hereafter amended to                                                                                                                                                                                                                                                                   which the holder of this Certificate assents by its acceptance.                                                                                                                                                                                                                                                                                                 This Certificate is not valid until countersigned by the Transfer Agent and registered by the Registrar.                                                                                                                                                                                                                                                                                                 Witness the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.                                                                                      12345678  123456789012345                                                                         Num/No.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         DATED                                     DD-MMM-YYYY            6         5         4         3         2         1                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         COUNTERSIGNED AND REGISTERED:                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       COMPUTERSHARE TRUST COMPANY, N.A.                                                                                                                                                                                                                                                                                                           PRESIDENT AND                                                                        Denom.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          TRANSFER AGENT AND REGISTRAR,                                                                                                                    XXXXXXXXXX                                                                                                                              XXXXXX  XX X                                                                                                                                              CHIEF EXECUTIVE OFFICER                                                                                                          1,000,000.00           6         5         4         3         2         1                                                                                                123456                                                                       Total 7         6         5         4         3         2         1                                                                                                                                                                                                                                                                                    VICE PRESIDENT, SECRETARY                                                                                                                                                                                                                                                                          By                                                                                                                                                                                                                                                                                             AND GENERAL COUNSEL                                                                                                                                                                                                                                                                                                                           AUTHORIZED SIGNATURE