SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): June 27, 2000 MINE SAFETY APPLIANCES COMPANY - ------------------------------------------------------------------------------- (Exact name of registrant as specified in its charter) Pennsylvania 0-2504 25-0668780 - ------------------------------------------------------------------------------- (State or other jurisdiction (Commission (IRS Employer of incorporation) File Number) Identification No.) 121 Gamma Drive RIDC Industrial Park O'Hara Township Pittsburgh, Pennsylvania 15238 - ------------------------------------------------------------------------------- (Address of Principal Executive Offices) (Zip Code) Registrant's telephone number, including area code: (412) 967-3000

Item 5. Other Events. The following document is filed as an exhibit to this Report. 99.1 Press release Mine Safety Appliances Company dated June 27, 2000.

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. MINE SAFETY APPLIANCES COMPANY (Registrant) By /s/ James E. Herald ---------------------------- James E. Herald Vice President - Finance Date: June 27, 2000

EXHIBIT 99.1 FROM: Ketchum Six PPG Place - Pittsburgh, Pa. 15222-5488 Contact: Mark Deasy - (412) 456-3843 FOR: MSA (Mine Safety Appliances Company) Ticker: MSA (AMEX) Contact: James E. Herald, VP - Finance & CFO Phone: (412) 967-3000 E-Mail: FOR IMMEDIATE RELEASE MSA SELLS STOCK TO PENSION PLAN June 27, 2000, PITTSBURGH -- John T. Ryan III, chairman and chief executive officer of Mine Safety Appliances Company (MSA), announced today the sale of 1.1 million shares of common stock to the MSA pension plan at a price of $24.00 per share. Proceeds of the sale will be used to reduce debt incurred to fund the purchase of 1.9 million shares of stock from the estate and family of Mrs. Helen Ruth Henderson. Mrs. Henderson, who passed away last summer, was the daughter of Mr. George H. Deike, Sr., a co-founder of MSA. The company announced the purchase of the Henderson shares on June 20, 2000. At that time the company noted it was exploring the possible sale of shares to its pension plan. There were approximately 12.7 million shares outstanding as of May 31, 2000. The combined effect of these two transactions has been to reduce the total shares outstanding to 11.9 million, a reduction of 6.3%. The combined financial impact is expected to be accretive to earnings per share and return on shareholders' equity. MSA is the world's leading provider of quality products and services that protect people's health, safety and the environment. The company has annual sales of about $500 million, manufacturing operations throughout the United States and 29 international affiliates. ###