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How to Test the Permeability of Industrial-grade material

Permeability testing services are one of the essential concepts for various industries like nonwovens, filtration, separation, etc. It helps in identifying low permeability materials that possess specific barrier properties to gases.

Among all these, the materials having shallow gas permeability are classified as barrier materials. They are mostly utilized as functional materials (for instance, commodity packaging and filtration materials).

On the other hand, the numerous varieties of high permeability materials possess excellent gas porousness and are widely used in industries, including clothing, medical, non-woven material, etc.

However, there’s a gap that needs to be filled. A gap in knowledge. Meaning, you need to know more about the importance of permeability testing services for industry-grade materials.


Permeability Testing Services and Operational Transformation

How to Test the Permeability of the Valuable Materials?

For all the materials such as plastic foam, cardboard, textiles, hollow ceramic, leather, and various other materials that contain high air permeability, their quantification is necessary. It has more relevance when they have a usage in some specific fields.

For instance, the permeability related to cigarette paper can affect the appearance of the cigarette directly along with its taste and smoke composition.

The air permeability of the textile material can affect the clothing's comfort directly. Professional permeability testing services are needed for such materials.

The methods to conduct the testing of air permeability could have a classification in two types. The first one is the pressure difference method having a constant flow rate, and the second is the flow measurement method containing the continual pressure difference.

What is the significance of the pressure difference method?

The pressure difference method has a utilization to test polyurethane foam, semi-rigid, and soft materials. The flow measurement method has usage for leather, geotextile, non-woven fabrics, textiles, etc.

The air permeability of the other materials like leather, paper, and different types of materials must go through testing for passing a particular volume of air because of the specific pressure difference. The calculation also takes place through the measured flow rate.

The test related to air permeability is based on a fixed pressure difference. There is no consistency of the national test standards that measures the pressure difference. For example, the ASTM D737 in the USA have a measurement based on (13mm water column), in France (20 mm water column), in the UK (10mm water column), etc.

Air permeability is a vital part of fabric permeability. The fabric's air permeability mainly occurs because of the gap between fibers in the material. It is due to this reason; different uses of fabric require different air permeability.

Wrapping Up

For testing the gas permeability of materials, the difference in material properties is imminent. For this reason, a noticeable difference in the testing instruments occurs. The selection of the corresponding tools under the testing requirements is optimal for acquiring a practical testing range.

Permeability testing services are favorable for the promotion of auto-gas permeability. They help in controlling materials including plastics, porous elastomer, polyurethane, and the likes.


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