This ASTM E1745 technical data explains how a polyethylene film vapor retarder should be reviewed below concrete slabs. It separates standard limits from typical references, lot-specific results, and project-confirmed values for thickness, water vapor permeance, tensile strength, puncture resistance, conditioned performance, and traceability. Final acceptance should use the submitted grade, current reports, and a representative mock-up under intended project conditions.
Clear protective film temperature is meaningful only when film construction, adhesive system, exposure temperature, exposure time, substrate, cooling, and post-heat checks are defined. This reference applies mainly to clear PET- or PE-based temporary protective films in heated processing or controlled storage. Use tested-grade or typical values for screening, then confirm peel, dimensional change, haze, edge condition, adhesive transfer, and removal on representative samples.
PET film puncture resistance describes how a defined PET, coated PET, or adhesive-backed PET construction responds to a controlled penetrating load. The result may include peak force, probe penetration, energy to failure, and the visible break pattern. These values support comparison of films exposed to sharp edges, local pressure, handling, or converting stress, but only under matched specimen and equipment conditions. Surface compatibility and removal behavior must be confirmed with the actual sample before full use. Puncture resistance is only one failure mode; the PET film properties comparison guide explains how to review tensile strength, elongation, thickness, shrinkage, optical properties, and surface behavior alongside puncture data.
