4. Properties required for breathable
fabrics:
• Optimum heat and moisture regulation (thermo-regularity effect)
• Absorption of surplus heat
• Dimensionally stable even when comes in contact to water
• No/Minimum water absorption of the layer of clothing just positioned to
the skin.
• Rapid drying to prevent catching cold.
• Good air and water vapor permeability.
• Rapid moisture absorption and conveyance capacity
• Soft feel, light weight and Durable
7. Upright Cup Method
• A desiccant, calcium chloride, is put into a cup. A piece of
fabric is then secured over the cup and placed in a
controlled environment. Then after period of time the
cup is weighed to see how much water has been “pulled”
into the cup through the fabric. The weight is then
extrapolated to show the number of grams per 24hours
per sq meter of fabric that will pass through the fabric.
9. Inverted Cup Method
A desiccant, Potassium Acetate, is put into a cup and sealed with
a piece of ePTFE . The fabric to be tested is then placed over the
cup with the fabric side to the cup.
The cup is then inverted into a pan of water. Then after period of
time the cup is weighed to see how much water has been
“pulled” into the cup through the fabric. The weight is then
extrapolated to show the number of grams per 24hours / per sq.
meter of fabric that will pass through the fabric.
11. Sweating Hot Plate
• In this test, fabric is placed above a porous metal plate.
The plate is heated and water is channeled into the metal
plate, simulating perspiration. The plate is then kept at a
constant temperature. As water vapor passes through
the plate and the fabric, it causes Evaporative Heat Loss
and therefore more energy is needed to keep the plate at
a constant temperature. Ret is the measurement of the
resistance to evaporative heat loss. The lower the Ret
value, the less resistance to moisture transfer and
therefore higher breathability.
15. Conclusion
• Comfort property has become the
most prime objective of the
buyer/consumer where breathability
of the fabric with water proofness
has been the primary importance in
areas that do not enjoy the
evergreen nature
