Form unique shapes inside filters to sift corrosive liquids and gases at temperatures up to 1900°F. Because this wool is flexible, it’s good for use inside tubing and other lab equipment that doesn’t support flat filters. It won’t expand or contract when used with harsh materials, such as acids and acidic gases; however, hydrofluoric and phosphoric acids will eat away at the quartz material. Unlike natural quartz, this quartz is more than 99.95% pure, which means it won’t let in contaminants and is useful in applications where maintaining purity is crucial.