Meaning
Standard test method for determination of oxygen gas transmission rate through plastic film at controlled relative humidity conditions specifies procedures for evaluating barrier performance in flexible packaging substrates under active moisture conditions. Distribution agreements covering oxygen-sensitive products specify astm f1927 to ensure film structures preserve product stability during high-humidity transit. The standard governs flat plastic films, sheets, laminates and coextrusions tested under controlled relative humidity, terminating where porous non-woven materials or non-planar rigid components are evaluated.
Environmental Conditioning
Coulometric sensors measure oxygen transmission while both sides of the test specimen maintain controlled relative humidity levels. Carrier gas streams transport transmitted oxygen molecules from the test cell directly to the sensor detector. Maintaining equal relative humidity on both sides prevents moisture gradient distortions that alter polymer chain spacing during measurement.
Commercial Guarantee
Quality assurance clauses in distribution contracts tie compliance with astm f1927 to lot acceptance protocols at receiving warehouses. Packaging convertors must supply certificates of analysis showing oxygen transmission rates within contract limits under ambient humidity conditions. Deviations from target transmission values grant distributors the contractual right to issue formal chargebacks or return non-compliant shipments at supplier cost.
Testing Limit
Measurements become unreliable when condensation forms directly upon the specimen surface during testing.
