There were different types of styrolite. Number 6 is one example. During her time aboard the USS Enterprise-D, Doctor Katherine Pulaski used styrolite to transport a genetically-engineered Human male aboard the ship for examination. With the assistance of Chief Miles O'Brien, a site-to-site transport protocol was implemented wherein the styrolite materialized slightly ahead of the patient, thus ensuring consistent quarantine. In addition to this precaution, a level 10 quarantine field was employed until integrity of the styrolite was confirmed. (TNG: "Unnatural Selection" )