Berkshire ValuSeal® IonX® is a laser-sealed-edge, cleanroom laundered wiper recommended for ISO Class 3 and above cleanroom environments. Composed of 100% polyester continuous filament yarns, its smooth knit construction and laser-sealed edges make it deal wiper for applications requiring critically low levels of particle and fiber release along with durability and chemical compatibility. A proprietary ISO Class 4 cleanroom laundry process insures ultra-low NVR and ionic contaminant levels, making ValuSeal® IonX® suitable for the most sensitive cleaning processes.