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These ISO 4 (FS209E Class 10) cleanroom masks are ideal for individuals working in ISO 4 to ISO 8 cleanrooms. Made from soft, flexible materials, they cover the nose and mouth, providing a comfortable fit while minimizing irritation. The lower numbered ISO classes indicate a cleaner mask than higher numbers, making these masks perfect for use in sensitive environments where contamination is a major concern. They are available in size M and feature dual, adjustable headstraps for a secure fit. With their exceptional quality and performance, these cleanroom masks are essential for maintaining a clean and controlled environment in various industries such as pharmaceutical manufacturing, biotechnology research, and microelectronics.