What is BS 3321 – Bubble pressure test of fabrics about?
BS 3321 is an international standard that focuses on the measurement of the equivalent pore size of fabrics (bubble pressure test). BS 3321 describes a method for the measurement of the equivalent pore radius, which provides an estimate of the size of the interstices in all types of fabric which are permeable to air. The method is particularly applicable to water repellent and filter fabrics.
Who is BS 3321 - Bubble pressure test of fabrics for?
BS 3321 on the measurement of the equivalent pore size of fabrics (bubble pressure test) is useful for:
- Product development entities
- Quality control entities
- Fabric manufacturing unit
- Clothing industries
- Textile testing laboratories
Why should you use BS 3321 - Bubble pressure test of fabrics?
Bubble point refers to the pressure at which the first flow of air through a liquid saturated fabric sample occurs and it is a measure of the largest pore-throat in a sample. The bubble point method is based on the principle that the critical pressure of an airflow applied across the thickness of a fabric evacuates the fluid trapped in the pore with the largest pore-throat.
BS 3321 informs that pressure required to force air bubbles through the interstices of a fabric, wetted by a liquid and having a film of the same liquid applied to its upper surface, is observed. This pressure together with the known surface tension of the liquid is used to estimate the size of the interstices in the fabric.
BS 3321 covers the test principle, apparatus required for the testing, and atmosphere for conditioning testing which helps you to conduct the test feasibly and determine the measurement of the equivalent pore size (bubble pressure) of the fabrics.
BS 3321 includes the determination of the pressure and vapour phase composition that are in equilibrium with a given liquid phase composition at a specified temperature.
BS 3321 guidelines help manufacturers to streamline production so that users have access to superior products made from suitable materials.
