Johns Manville Restarts Fiberglass Furnace in Slovakia

On April 25, 2023, Johns Manville restarted a glass melter, after it was taken out of service for a routine rebuild. The furnace had previously reached the end of its service life after a record campaign of 10 years.

“This is an outstanding achievement from a technology perspective,” said John Vasuta, president of Johns Manville Engineered Products. "The teams from Trnava and our Johns Manville Technical Center in the U.S. worked together extremely well and did a fantastic job to achieve such a long life for the furnace. The rebuild also went remarkably smoothly."

This furnace rebuild also affirms Johns Manville’s commitment to continue serving the industry in Europe with regional production.

At JEC World last month, Johns Manville showcased its full potential of StarRov® single-end rovings, MultiStar® multi-end rovings and ThermoFlow® and StarStran® chopped strands – all of which expand the capabilities of thermoplastic and thermoset composites. In addition, Johns Manville showcased its innovative Neomera® PA-6 organosheet products, which feature exceptionally good mechanical properties thanks to their patented reactive sizing technology. 

About Johns Manville

Johns Manville, a Berkshire Hathaway company (NYSE: BRK.A, BRK.B), is a leading manufacturer and marketer of premium-quality building and specialty products. In business since 1858, the Denver-based company has annual sales over $4 billion and holds leadership positions in all of the key markets that it serves. Johns Manville employs 8,000 people and operates 44 manufacturing facilities in North America and Europe. Additional information can be found at

Johns Manville Corporate Communications