ASTM E96 Gravimetric Determination of Water Vapor Transmission Rate of Materials

It is used for a wide variety of packaging materials, waterproofing membranes, building materials, textiles, films, coatings and laminates, and vapor barriers. ASTM E96 can assist manufacturers in optimizing their moisture protection, enhancing product durability, comparing the performance of materials, and ensuring compliance with industry specifications. Test results are reported in SI units (the internationally used system of measurement), allowing laboratories to compare results reliably and consistently. 

Get Certified ASTM E96 Testing for Accurate Moisture Barrier Performance Evaluation

ASTM E96 testing demonstrates the measured water vapor transmission characteristics of materials under specified laboratory conditions. Water vapor transmission rate and moisture permeability are laboratory tested in a controlled environment. ASTM E96 test results support product development, quality assurance, manufacturing consistency, and material selection by providing standardized water vapor transmission measurements. 

• Measures the water vapor transmission rate (WVTR) of materials.
• Calculates the material’s moisture vapor permeability when required.
• Evaluates moisture barrier performance under controlled environmental conditions.
• Helps ensure quality control and product improvement.
• Applicable in packaging, construction, textile, and coating industries.
• Establishes standardized procedures for comparing the water vapor transmission properties of different materials.

What are the Uses of ASTM E96 Testing?

ASTM E96 testing is useful for manufacturers to assess the moisture barrier properties of packaging, construction materials, fabrics, and protective coatings. These results assist with product development, quality assurance, material selection, and meeting industry standards.

• Packaging manufacturers use ASTM E96 to assess the moisture resistance of films, laminates, and flexible packaging used to protect food, pharmaceuticals, and consumer goods. Measuring WVTR accurately improves the shelf life of the product and package performance.
• ASTM E96 is used to evaluate vapor barriers, roofing membranes, insulation systems, waterproof coatings, and building materials. Moisture control in building envelopes and long-term structural durability is achieved through reliable testing.
• Textile manufacturers use the ASTM E96 test for breathable fabrics, waterproof clothing, protective wear, and outdoor performance textiles. The outcomes are used to help balance the moisture resistance and wearer comfort.
• Coating manufacturers use ASTM E96 to compare the effectiveness of protective coatings and surface treatments in preventing moisture entry and preserving coating durability.
• Research laboratories use ASTM E96 to compare new barrier materials, multilayer films, and advanced membrane technologies.

What Materials Can Be Tested Under ASTM E96?

ASTM E96 can be used to test a variety of materials for which moisture vapor transmission properties need to be assessed. They are used in a wide variety of applications such as protective clothing, pharmaceutical packaging, food packaging, composite products, adhesives and sealants, construction barriers, waterproof coatings, insulation materials, paper products, polymer membranes and plastic films, and many more where moisture control is essential to long-term product performance. 

Why is ASTM E96 Important for Moisture Barrier Evaluation?

ASTM E96 offers a standardized test for measuring water vapor transmission in order to allow manufacturers to fairly compare moisture barrier performance. Accurate WVTR information can be used to enhance product durability, design packaging to achieve optimal performance, avoid product failures related to moisture, assist in material selection, meet industry regulations, and ensure product consistency and quality under different environmental conditions. 

Common Challenges and Troubleshooting

Improper specimen sealing, leaks around the test cup, environmental conditions, balance calibration, specimen conditioning, and operator error are all potential factors that could lead to inaccurate ASTM E96 test results. Reliable and repeatable water vapor transmission measurements are achieved through specimen preparation, sealing, calibrated equipment, controlled humidity and temperature, and trained laboratory staff. 

Other ASTM standards mentioned in this specification are ASTM D1653, D1434, and D3574.

ASTM E96 Testing Process and Data Collection

Testing starts by conditioning a sample of the material that is representative of the product before securely mounting it above a standard sample cup of either water or desiccant. The sealed assemblies are then placed in a controlled environmental chamber, and the temperature and relative humidity are controlled throughout the test. The moisture gain or loss is measured with a precision analytical balance by the technicians at regular intervals, weighing the test cups. The weight change over time is used to calculate the water vapor transmission rate (WVTR), moisture permeability, environmental conditions, dimensions of the specimen, and test duration.