G571 Fabric Breathability Tester Standards
The fabric breathability tester is used to quickly determine the
breathability of various sheet-like materials such as coated fabrics, filter
paper, filter materials, plastics, etc.
Breathability testing standards:
The comparison of air permeability testing standards, commonly used air
permeability testing standards include ASTMD737-1996 "Test Method for Air
Permeability of Textiles", ISO9237-1995 "Determination of Air Permeability of
Textile Fabrics", GB/T 5453-1997 "Determination of Air Permeability of Textile
Fabrics" and JIS L1096-1999 "Test Method for Air Permeability of Textiles".
Among them, GB/T 5453-1997 is equivalent to ISO9237-1995. JISL1096-1999 is
divided into Method A and Method B. Method A uses a Frazir permeability tester
with a pressure difference of 125Pa, and measures 5 times to obtain the average
value; The B method uses a Gurley air permeability tester to measure the time it
takes for 300mL of air to pass through the fabric at a specific pressure
difference. The air permeability is expressed in seconds and is suitable for
woolen fabrics. Due to the requirement of using specific instruments in
JISL1096, it is not commonly used in daily quality testing.
Breathability testing principle:
Air passes through the fabric vertically, forming a certain pressure
difference between the front and back of the fabric. The amount of air passing
through the fabric per unit time under a certain pressure difference is
measured, which is the breathability of the fabric. Compare existing testing
standards for textile breathability and study various factors that affect fabric
breathability.
The commonly used methods for testing the breathability of textiles are
ASTMD737-1996 and GB/T5453-1997. Because air leakage can affect the test results
of fabric permeability, measures to prevent air leakage are mentioned in each
test standard, requiring the use of sample fixtures and rubber washers. Rubber
gaskets are prone to aging and deformation after multiple uses, which can affect
the test results and should be discarded. The sample fixture is suitable for
knitted fabrics or fabrics that are prone to sticking to the test head, and is
not suitable for heavy or stiff fabrics. When there is a difference in
breathability between the front and back of the tested fabric, the side with
lower pressure should face downwards to prevent air leakage. If you want to
obtain the breathability of the fabric, you can cover the sample with a non
breathable cover and measure the air leakage and air flow rate through the
fabric separately.
2024-03-28 17:15