Also useful for protecting contents of plate from contamination during multiple manual reagent additions over time. X-Pierce films are 89 μm thick vinyl with a 18 μm thick adhesive layer, designed for temporary protection from contamination and evaporation for samples in 96 well plates. A precut "X" over each well creates four flaps that easily bend downward when pushed by a robotic probe or pipette tip, allowing sample access without coring or adhesive fouling. A thin adhesive layer and special hairline cuts separating the X-Pierce flaps combine to prevent probes from contacting adhesive and becoming occluded. The flaps return to their original position after sampling for continued protection. For long-term sample protection after sampling, a continuous film should be applied as a second layer.

X-Pierce is a trademark of Excel Scientific, Inc.