Form of Performance Stock Unit Award Agreement under the PQ Group Holdings Inc. 2017 Omnibus Incentive Plan

Grant of PSUs. The Company has granted to the Participant [●] PSUs (the “Target Award), effective as of the Date of Grant, on the terms and conditions set forth in the Plan and this Agreement, subject to adjustment as forth in the Plan.

Earning and Vesting of PSUs. Subject to the terms and conditions set forth in the Plan and this Agreement, the PSUs may be earned and will vest as follows:

Performance Conditions. Between 0% and 200% (the “Payout Range”) of the Target Award is eligible to be earned contingent on achievement of the Performance Measures set forth on Appendix A to this Agreement during the period beginning on January 1, 2019 and ending on December 31, 2021 (the “Performance Period”) and other terms and conditions as set forth in Appendix A to this Agreement.

Vesting Schedule. Subject to the terms and conditions set forth in the Plan and this Agreement, and except as otherwise provided in Section 2(b) or Appendix A of this Agreement, any PSUs that are earned in accordance with Appendix A will vest on the date the Committee certifies the levels of achievement of the Performance Measures, which shall be no later than sixty (60) days following the end of the Performance Period (the “Performance Vesting Date”), subject to the Participant’s continued Service through the Performance Vesting Date (or other

Termination of Service. Except as otherwise provided in Appendix A of this Agreement, the Participant shall forfeit, immediately and without consideration, all unvested PSUs upon a termination of the Participant’s Service for any reason. Without limiting the generality of the foregoing, the PSUs and the Shares (and any resulting proceeds) will continue to be subject to Section 13 of the Plan.

Settlement. The Company shall deliver to the Participant within thirty (30) days following the vesting date of the PSUs (but no later than March 15^th of the year following the year in which such PSUs are earned hereunder) a number of Shares equal to the aggregate number of PSUs that are earned in accordance with Appendix A and that vest on such date. No fractional Shares shall be delivered. The Company may deliver such Shares either through book entry accounts held by, or in the name of, the Participant or cause to be issued a certificate or certificates representing the number of Shares to be issued in respect of the PSUs registered in the name of the Participant.

Withholding Requirements. The Company will have the power and the right to deduct or withhold automatically from any Shares deliverable under this Agreement or from any other compensation payable to the Participant, or to require the Participant or the Participant’s representative to remit to the Company, up to the maximum statutory amount necessary to satisfy federal, state and local taxes, domestic or foreign, required by law or regulation to be withheld with respect to any taxable event arising as a result of this Agreement. Nothing in this Agreement may be construed as relieving the Participant of his or her obligation to satisfy all taxes required to be withheld in connection with the award, vesting or settlement of the PSUs.

Securities Laws Requirements. No Shares will be issued or transferred pursuant to this Agreement unless and until all then applicable requirements imposed by federal and state securities and other laws, rules and regulations and by any regulatory agencies having jurisdiction, and by any exchanges upon which the Shares may be listed, have been fully met. As a condition precedent to the issuance of Shares pursuant to this Agreement, the Company may require the

Rights of a Shareholder of the Company. Prior to settlement of the PSUs and the delivery of Shares to the Participant with respect thereto, neither the Participant nor the Participant’s representative will have any rights as a shareholder of the Company with respect to any Shares underlying the PSUs and the Participant will not receive payment of, or credit for, dividends or dividend equivalents with respect to any Shares underlying the PSUs.

Transfer Restrictions. The PSUs may not be transferred except as expressly permitted under Section 15.3 of the Plan. The Shares delivered hereunder will be subject to such stop transfer orders and other restrictions as the Committee may deem advisable under the Plan or the rules, regulations and other requirements of the Securities and Exchange Commission, any stock exchange upon which such Shares are listed, any applicable federal or state laws and any agreement with, or policy of, the Company or the Committee to which the Participant is a party or subject, and the Committee may cause orders or designations to be placed upon the books and records of the Company’s transfer agent to make appropriate reference to such restrictions.

No Right to Continued Service. Nothing in this Agreement or the Plan confers upon the Participant any right to continue in Service for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Company (or any Subsidiary retaining the Participant) or of the Participant, which rights are hereby expressly reserved by each, to terminate his or her Service at any time and for any reason, with or without Cause.

Notification. Any notification required by the terms of this Agreement will be given by the Participant (i) in a writing addressed to the Company at its principal executive office and will be deemed effective upon actual receipt when delivered by personal delivery or by registered or certified mail, with postage and fees prepaid, or (ii) by electronic transmission to the Company’s e-mail address of the Company’s General Counsel and will be deemed effective upon actual receipt. Any notification required by the terms of this Agreement will be given by the Company (x) in a writing addressed to the address that the Participant most recently provided to the Company and will be deemed effective upon personal delivery or within three (3) days of deposit with the United States Postal Service, by registered or certified mail, with postage and fees prepaid, or (y) by facsimile or electronic transmission to the Participant’s primary work fax number or e-mail address (as applicable) and will be deemed effective upon confirmation of receipt by the sender of such transmission.

Entire Agreement. This Agreement and the Plan constitute the entire agreement between the parties hereto with regard to the subject matter of this Agreement. This Agreement and the Plan supersede any other agreements, representations or understandings (whether oral or written and whether express or implied) that relate to the subject matter of this Agreement.

Waiver. No waiver of any breach or condition of this Agreement will be deemed to be a waiver of any other or subsequent breach or condition whether of like or different nature.

Successors and Assigns. The provisions of this Agreement will inure to the benefit of, and be binding upon, the Company and its successors and assigns and upon the Participant, the Participant’s executor, personal representative(s), distributees, administrator, permitted transferees, permitted assignees, beneficiaries, and legatee(s), as applicable, whether or not any such person will have become a party to this Agreement and have agreed in writing to be joined herein and be bound by the terms hereof.

Severability. The provisions of this Agreement are severable, and if any one or more provisions are determined to be illegal or otherwise unenforceable, in whole or in part, then the remaining provisions will nevertheless be binding and enforceable.

Choice of Law; Jurisdiction. This Agreement and all claims, causes of action or proceedings (whether in contract, in tort, at law or otherwise) that may be based upon, arise out of or relate to this Agreement will be governed by the laws of the State of Delaware, excluding any conflicts or choice-of-law rule or principle that might otherwise refer construction or interpretation of this Agreement to the substantive law of another jurisdiction. The Participant agrees that he or she will bring all claims, causes of action and proceedings (whether in contract, in tort, at law or otherwise) that may be based upon, arise out of or be related to the Plan and this Agreement exclusively in the federal and state courts located within the geographic boundaries of the United States District Court for the Eastern District of Pennsylvania (the “Chosen Court”), and hereby (i) irrevocably submits to the exclusive jurisdiction of the Chosen Court, (ii) waives any objection to laying venue in any such proceeding in the Chosen Court, (iii) waives any objection that the Chosen Court is an inconvenient forum or does not have jurisdiction over any party and (iv) agrees that service of process upon such party in any such claim or cause of action will be effective if notice is given in accordance with this Agreement.

Acceptance. The Participant hereby acknowledges receipt of a copy of the Plan and this Agreement. The Participant has read and understands the terms and provisions of the Plan and this Agreement, and accepts the PSUs subject to all of the terms and conditions of the Plan and this Agreement. In the event of a conflict between any term or provision contained in this Agreement and a term or provision of the Plan, the applicable term and provision of the Plan will govern and prevail.

Determination of Earned PSUs. The number of PSUs that are earned under this Appendix A will be determined by multiplying the Performance Factor by the Target Award.

Rules for Determining the Performance Factor. The following rules will apply in determining the Performance Factor:

If actual performance is below threshold for either Performance Measure, the Performance Factor will be zero percent (0%), and no PSUs will be earned.

If actual performance is above maximum for both Performance Measures, the Performance Factor will be (and will not exceed) two hundred percent (200%).

If actual performance is between the threshold and maximum benchmarks for Three-Year Average ROANTA and Three-Year Average Adjusted Free Cash Flow set forth in the chart above, then the Performance Factor will be determined by linear interpolation.

In calculating the Performance Factor, all percentages will be rounded to the nearest one-tenth (1/10^th) of one percent (1%). In calculating the number of PSUs that are earned under Section 1 of this Appendix A, the number of earned PSUs shall be rounded to the nearest whole PSU.

Three-Year Average Adjusted Free Cash Flow is defined as:

Adjustments. Certain adjustments may be made at the discretion of the Committee to the Average Three-Year ROANTA and the Three-Year Average Adjusted Free Cash Flow thresholds, targets and maximums as set forth in the table above in the event of the Company’s acquisition or divestiture of an entity, business, or product line, or any capital market transactions including debt refinancings or equity offerings.

Termination by Reason of Disability, Retirement, Good Reason, Termination by the Company without Cause or Death. Upon a termination of the Participant’s Service during the Performance Period by reason of Disability, Retirement (defined below), Good Reason (defined below), termination by the Company without Cause, or death, the PSUs shall be eligible to be earned and to vest as follows (and any PSUs that are not earned and do not vest under the circumstances described below will be forfeited and cancelled without payout of consideration therefor):

If the Participant’s Service is terminated by the Company without Cause or due to his or her Disability, or if the Participate terminates his or her Service due to Retirement or Good Reason, in each case, before the end of the Performance Period, the PSUs will remain outstanding and will be eligible to be earned based on actual performance as determined under this Appendix A, subject to pro ration as provided for below, and to vest on the Performance Vesting Date. Any PSUs that are so earned will be pro rated by dividing the number of earned PSUs by a fraction, the numerator of which is the number of days the Participant actually worked in the Performance Period, and the denominator of which is the number of days in the Performance Period.

If the Participant’s Service is terminated due to his or her death before the end of the Performance Period, upon such termination, a number of PSUs will be deemed earned and will vest equal to the Target Award multiplied by a fraction, the numerator of which is the number of days worked in the Performance Period, and the denominator which is the total number of days in the Performance Period.

For purposes of this Appendix A, “Retirement” means a termination of Service due to the voluntary resignation of the Participant, other than at a time when Cause exists, after attaining the age of 60 with a minimum of ten years of continued Service (for the avoidance of doubt, from the most recent hire date, including service with predecessor acquired entities).

For purposes of this Appendix A, “Good Reason” shall have the meaning set forth in any severance agreement between the Participant and the Company and/or any of its Subsidiaries to the extent that such severance agreement provides for the voluntary resignation of the Participant for “Good Reason”.

If a Change in Control occurs during the Performance Period, upon such Change in Control, a number of PSUs will be deemed earned and will vest as provided for in Section 7.2 below. Any PSUs that do not vest in connection with such Change in Control as provided for in this Section 7 will be forfeited and cancelled without payment of consideration therefor.

For purposes of determining the number of PSUs that vest in connection with a Change in Control, the Performance Factor shall be determined as otherwise set forth in Sections 2, 3 and 4 of this Appendix A, except that (i) the Performance