PTFE random packing specifications should identify whether virgin unfilled PTFE is required, define product geometry and quantity basis, and require disclosure of any fillers or modified formulations.

PVDF tower packing procurement should define the required resin basis, virgin/recycled restrictions, chemical and temperature conditions, material documentation, and substitution rules. “PVDF” should not be replaced by a generic fluoroplastic description.

CPVC tower packing and internals should be procured against defined chemical and temperature conditions. The specification should also control product form, joining materials, documentation, and any proposed material substitution.

PVC tower packing and internals should be specified using the appropriate rigid material grade, actual chemical and temperature conditions, recycled-material restrictions, and suitable fabrication materials rather than the word “PVC” alone.

Conductive and antistatic plastic tower packing should be specified using the required electrical property, base polymer, approved additives, chemical compatibility, and test documentation. Color alone is not proof of electrical performance.