A word or two about pressure ratings:
The pressure comment on the spool label of our (Domestic) products is specific to the test performed by Underwriters Laboratories (UL) in the certification of our products. All PTFE thread seal tapes, regardless of manufacturer, which are submitted to UL for certification are subject to their uniform test at 100 psi. If we produce a product labeled with their certification, we have to include that paragraph at the bottom of the label which includes the 100 psi statement.
That does not mean our tapes cannot exceed 100 psi, in fact they generally do, One Hundred PSI is just the extent of the UL test and their required labeling.
All our Domestic products are 100% virgin PTFE, they do not contain any fillers or reprocessed materials, and are frequently used in systems where pressures exceed 10,000 psi. We cannot certify to this level because we do not control the other components in the system or the assembly process. But as a rule, our tapes, when properly used, will meet or exceed the minimum pressure rating of the components they are used with.