Exhibit 23.1 Consent of Independent Accountants We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 of the Quaker Chemical Corporation of our report dated June 18, 2002 relating to the financial statements of the Quaker Chemical Corporation Retirement Savings Plan, which appears in this Form 11-K. /s/ PRICEWATERHOUSECOOPERS LLP Philadelphia, Pennsylvania June 24, 2002