Our Fiberglass String Wound Cartridge Filters are recommended for high temperatures and high corrosion applications. String wound filters are a 'depth' filter created by winding diamonds onto a core with 1" to 4" of filtration media. Depth Fiberglass filters provide a high dirt holding/retention capability with low media migration. They are spun wound to micron ratings from .5 to 200 and are manufactured in our facility in Coleman, Texas. For use to 800ºF.