Used in controlled environments, sticky mats (aka tacky or adhesive mats) are a stack of sheets of polyethylene film, with a specially treated pressure sensitive adhesive on one side and a colored sheet on the bottom. With the adhesive side facing up, when person walks on the mat entering a cleanroom or controlled environment, the tacky mat removes contamination such as dirt, dust, or foreign particles on shoe heels and soles. When a sheet becomes loaded with contamination, it is peeled off, exposing a new clean sheet. The numbers in the corner indicate the remaining number of sheets left.
Sticky Mats are used in a variety of industries, including microelectronics, aerospace, pharmaceutical, military, food, hospitals, and many others. They can even be used in a house or garage.
Some mats have a "High Tack" level. This means they are "stickier" than a medium tack level, which is the standard tack level. High Tack mats are indicated by an " HT" in the part #.
Some mats have colored peel-off sheets rather than clear. This is typically indicated by two letters in the part #. BB means Blue on Blue. WW means White on White... etc.