Spec-Wipes Spec-Wipe 4 Sterile Wiper. Combining top-notch and uncompromising quality with an affordable price the Spec-Wipes Spec-Wipe 4 Sterile Wiper 21914-772/ 21914-772 can fulfill your laboratory needs while still offering a great value for the money. Product Category Description: Wiper offers superior quality for aseptic environments where bacteria particulate and extractable levels are critical concerns. This 100percent double-knit polyester wiper has low levels of contaminants as a result of its tightly-spun continuous-filament material and clean-cut edges. While designed to be durable for rigorous cleaning it is soft enough for delicate surfaces. Wiper is laundered in an ISO Class 4 (FED-STD-209E Class 10/M2.5) cleanroom and sterilized by gamma radiation to a Sterility Assurance Level of 10 6 in accordance with ANSI/ISO/AAMI guidelines. Stacked. Specifications for Spec-Wipes Spec-Wipe 4 Sterile Wiper 21914-772 : Dimensions cm (in.): 30.5 x 30.5 (12 x 12) Unit: Case of 300 Particle Generation (>=0.5 m) Biaxial Shake: =0.5 m) Fibers (>=100 m):