Made of low-linting fabric, these masks won’t shed fabric particles that could contaminate your clean room. They come double bagged and are suitable for use in clean rooms rated to both Federal Standard and ISO classes. In both systems, clean rooms with lower class ratings have fewer contaminants. Toss these masks out after each use so you’re always wearing a fresh mask. They fit tight around your face to prevent contaminants from escaping—just pinch the nosepiece.