The microporous structure of the GORE membrane enables gas flow even at the smallest difference in pressure. This means that unlike classic valve systems, such as mushroom valves, no response pressure is required to enable gas transport.

The airflow value in liters per hour (l/h), which can also be found in the product information, is a “dry” measured value, i.e. the vent has not been dampened by a liquid in advance. This allows the various GORE Packaging Vents to be evaluated relative to one another. The value can be used as initial selection criteria, but not the only one.

Direct contact with a liquid can significantly change the remaining airflow later on. It is therefore critical to not choose a vent based on the dry airflow performance only. An on-site application test must be performed for a new application or formulation change.

The resistance of the laminate to liquid penetration or leakage depends on the properties of the membrane, such as the size of the pores and the properties of the product in question, such as surface tension or viscosity. A liquid can enter or be pushed through a porous barrier from a certain given pressure. Due to the wide range of products and chemistries used in packaging, the values specified in the data sheets for GORE Packaging Vents should always refer to water as the reference liquid.

If liquid product covers the membrane surface of a GORE® Packaging Vent when a container is on its side or upside down, gas exchange cannot take place. In order for the vent to work, the gas in the container must be able to sit directly on the active surface of the GORE membrane.

GORE Packaging Vents D15 and D17 Molded Components are marked with an individual number on each part using a laser. This data enables traceability right back to the basic components utilized at the start of the Gore value-added chain. Thanks to the marking, a component can be individually distinguished and it can be ensured that an original GORE Packaging Vents Molded Component was used, even after use. In-depth traceability, complementary quality assurance measures, and airflow and visual tests provide the necessary safety for the packaging and transportation of hazardous goods.

Because all liquids are not the same! Even if you use a qualified container with a venting membrane to equalize pressure, the container can still leak. Passing the pressure test with water does not ensure that the membrane can prevent YOUR chemical formulation from leaking or spilling when exposed to real-world conditions. Every liquid formulation has a unique chemical make-up that results in significant variations in surface tension and viscosity. These properties translate to unique liquid entry pressure, most of which are very different from those of water.