Attached files
| file | filename |
|---|---|
| S-1/A - AMENDMENT NO.2 TO THE FORM S-1 - Ecovyst Inc. | d382954ds1a.htm |
| EX-23.4 - EX-23.4 - Ecovyst Inc. | d382954dex234.htm |
| EX-23.3 - EX-23.3 - Ecovyst Inc. | d382954dex233.htm |
| EX-23.2 - EX-23.2 - Ecovyst Inc. | d382954dex232.htm |
| EX-23.1 - EX-23.1 - Ecovyst Inc. | d382954dex231.htm |
| EX-10.19 - EX-10.19 - Ecovyst Inc. | d382954dex1019.htm |
| EX-10.13 - EX-10.13 - Ecovyst Inc. | d382954dex1013.htm |
| EX-10.12 - EX-10.12 - Ecovyst Inc. | d382954dex1012.htm |
| EX-10.11 - EX-10.11 - Ecovyst Inc. | d382954dex1011.htm |
| EX-10.10 - EX-10.10 - Ecovyst Inc. | d382954dex1010.htm |
Exhibit 16.1
August 14, 2017
Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C. 20549-7561
Dear Sirs/Madams:
We have read the section entitled “Changes in and Disagreements With Accountants on Accounting and Financial Disclosure” included within “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of PQ Group Holdings Inc.’s registration statement on Form S-1 (Registration No. 333-218650), and have the following comments:
| 1. | We agree with the statements made in the first, second and fourth paragraphs of the aforementioned section. |
| 2. | We have no basis on which to agree or disagree with the statements made in the third paragraph of the aforementioned section. |
Yours truly,
/s/ DELOITTE & TOUCHE LLP