ASTM F1249 sets forth standard test methods for determining the water vapor transmission rate of plastic films and sheeting. The technique allows for dependable moisture permeability results for barrier materials to be obtained for use in packaging and other applications. The scope includes:
- Covers the determination of water vapor transmission rate (WVTR) through plastic films and sheeting.
- Uses a modulated infrared sensor for moisture detection.
- Operates under controlled temperature and relative humidity during testing.
- Establishes standard methods for measuring moisture barrier properties.
- Assists quality assurance, product development, material comparison, and regulatory compliance.
- Applies mainly to homogeneous plastic films, multilayer flexible packaging materials, laminates, coated films, etc., which are used as barrier materials.
What are the Uses of ASTM F1249 Testing?
ASTM F1249 testing provides measured moisture barrier performance data that manufacturers, laboratories, and product developers use for material evaluation and quality control. Test results provide WVTR data that help evaluate whether packaging materials have suitable moisture barrier properties for the intended storage conditions and product requirements. Common applications include:
- ASTM F1249 measures the water vapor transmission rate (WVTR) of plastic films and sheeting under controlled environmental conditions.
- The test is used by packaging manufacturers to verify the moisture barrier performance of production materials and to support quality control and product qualification.
- ASTM F1249 results are used together with other package performance evaluations to help select packaging materials having suitable moisture barrier properties.
- The method is used in the pharmaceutical and medical device industries to test packaging to ensure moisture-sensitive products are not affected by environmental exposure.
- Barrier materials are evaluated by electronics manufacturers to minimize moisture intrusion, which could affect sensitive electronic components.
- ASTM F1249 can be used to evaluate new packaging materials and to enhance moisture barrier properties of existing materials in research and development laboratories.
- ASTM F1249 testing is used to assist in quality assurance programs, supplier qualification, regulatory compliance, and product certification related to packaging applications.
What Materials Can Be Tested Under ASTM F1249?
ASTM F1249 can be used for many flexible materials that are intended to be used as a moisture-resistant barrier. Common films that are typically tested with this standard include plastic films, multilayer laminates, metalized films, coated films, barrier films, and flexible packaging materials, as well as paper-plastic laminates, biodegradable films, polymer sheets, elastomeric films, medical packaging materials, pharmaceutical packaging, food packaging films, and specialty moisture barrier materials.
Why is ASTM F1249 Important?
ASTM F1249 offers a standardized test method for measuring the water vapor transmission rate of packaging materials, ensuring moisture barrier performance can be compared based on consistent testing protocols. Accurate WVTR data can be used to enhance packaging design, select the optimum materials, ensure product quality, and minimize product spoilage from excessive moisture exposure. The standard can also be used to aid product development, quality control, regulatory compliance, and international trade activities by offering precise and repeatable measurements that can be compared from laboratory to laboratory. For products that are especially susceptible to moisture, such as pharmaceuticals, food, electronics, and medical devices, moisture barrier evaluation is especially crucial.
Common Challenges and Troubleshooting
Proper specimen preparation, calibrated equipment, and carefully controlled environmental conditions are key to accurate ASTM F1249 testing. Possible factors that influence the accuracy of the test may include leaks in the specimen, damaged specimen, variable specimen thickness, inadequate sealing of the test cell, contaminated specimen surfaces, inappropriate test cell temperature or humidity, and incorrect instrument calibration. Clean specimens, calibration of equipment/gauges, sealing, control of environmental conditions in the laboratory, and standard testing procedures are important factors in obtaining accurate WVTR data that are repeatable and reproducible.
