Antistats (A/S) are divided into two general categories, external and internal. External antistats are topical agents applied to the surface. Washing the surface or repeated handling removes external antistats, thus requiring reapplication.
Internal antistats can be inert conductive fillers such as conductive carbon black, metalized fillers, or carbon fibers. Clear polymeric antistats are also available; these are non-migratory and provide antistatic properties independent of atmospheric humidity. Non-migratory antistats form a percolating network similar to a conductive carbon black.
Migratory antistats can be further divided into ionic and non-ionic types. Ionic antistats are recommended for polar resin systems such as PVC. Generally, ionic antistats are not recommended for polyethylene due to their low thermal stability. Non-ionic antistats are organic compounds composed of hydrophilic and hydrophobic portions. The compound migrates to the substrate surface, and, via hydrogen bonding with atmospheric water, creates a microscopic layer of water on the surface. Migratory antistats are therefore dependent upon atmospheric moisture for their mechanism to dissipate static electricity. The function of a migratory antistat is similar to that of an antifog.
The type of antistat used is determined by resin system, test specifications, FDA restrictions and end use application. To read more about antistats, click here.
For specific information about Antistat Masterbatches for your application, please complete our product inquiry form or contact your local Ampacet representative.