8000–10000 mL/min/cm² @ 7 kPa High-Flow Vent Cap for Agrochemical Packaging

The XINXIA high-flow vent cap is designed for agrochemical containers that require fast pressure equalization during storage, transportation, and use. With an airflow rate of 8000–10000 mL/min/cm² at 7 kPa, it provides a controlled gas-release path for packaging containing pesticides, liquid fertilizers, disinfectants, crop-protection chemicals, and other formulations that may generate gas or experience pressure changes.

The vent cap can be integrated with a microporous venting membrane to allow air and gas to pass through while helping reduce the risk of liquid leakage and external contamination. Compared with an ordinary non-vented closure, it can help prevent container swelling, paneling, cap loosening, and leakage caused by pressure differences.

Cap dimensions, housing material, membrane performance, installation structure, color, and packaging method can be customized. XINXIA also provides sample testing and technical support to help customers evaluate airflow, water-entry pressure, chemical compatibility, and installation performance before mass production.

Agrochemical formulations can create challenging packaging conditions. Some products slowly release gas because of chemical reactions, temperature changes, ingredient decomposition, or interaction with moisture. During transportation, containers may also experience changes in altitude, atmospheric pressure, and storage temperature.

Without a suitable venting solution, internal pressure can gradually increase. This may result in:

• Swollen bottles, pails, or container panels
• Deformed packaging during warehouse storage
• Leakage around the cap or sealing area
• Loosened closures caused by continuous internal pressure
• Product spraying or splashing when the container is opened
• Reduced packaging appearance and customer confidence
• Increased risk of returns, complaints, or transportation losses

Negative pressure can also develop when a filled container cools after packaging. This may cause bottle paneling or make rigid containers difficult to dispense. Conventional caps provide sealing but cannot actively balance the pressure between the inside of the container and the surrounding environment.

The XINXIA agrochemical vent cap combines a protective cap structure with a microporous venting membrane. Its airflow capacity of 8000–10000 mL/min/cm² at 7 kPa is suitable for packaging applications requiring rapid gas exchange.

The microscopic pores of the membrane create a controlled pathway for air and gas. When pressure builds inside the container, gas passes through the membrane and is discharged to the outside. If negative pressure develops, external air can enter through the same pathway to restore pressure balance.

For applications involving aggressive liquids, customers can select a hydrophobic or hydrophobic-and-oleophobic membrane according to the chemical formulation. The final membrane grade should be selected by considering airflow, liquid-barrier requirements, surface tension, viscosity, chemical compatibility, and container orientation.

Rather than relying only on theoretical airflow data, XINXIA can arrange application-based sample testing using the customer’s cap design, container, and actual filling product or a suitable test medium.

The stated airflow should be confirmed under the agreed test method and effective membrane area. Final performance may vary according to membrane grade, venting area, cap structure, welding quality, and test equipment.

Some pesticide and herbicide formulations can generate gas during storage. The vent cap helps release accumulated pressure and reduces the possibility of bottle swelling or closure leakage.

Liquid fertilizers may experience pressure changes caused by temperature variation or formulation activity. A high-flow vent cap helps maintain a more stable internal pressure during warehouse storage and long-distance transportation.

Certain disinfectants and oxidizing products require efficient venting because small amounts of gas may develop inside the package. Membrane compatibility and liquid-barrier performance must be evaluated according to the specific formulation.

The vent cap can also be considered for jerrycans, drums, intermediate packaging, and other chemical containers that require continuous pressure equalization.

Containers may be filled in one temperature environment and transported through regions with different temperatures or altitudes. The vent cap helps compensate for these pressure variations without requiring the operator to loosen the closure manually.

The vent cap contains a gas-permeable membrane installed inside a protective plastic structure. The membrane has numerous microscopic pores that allow air and gas molecules to pass through.

When the internal pressure becomes higher than the external pressure, gas moves outward through the membrane. When the internal pressure is lower, air can move inward. This two-way gas exchange gradually balances the pressure while the cap remains closed.

The vent cap does not remove the need for a reliable container seal. Its function is to create a controlled venting path. The cap design, membrane welding area, sealing interface, and installation tolerance must work together to achieve consistent performance.

For liquid packaging, airflow and water-entry pressure should be evaluated together. Choosing the highest airflow alone may not provide the best result if the container is frequently tilted, inverted, or exposed to low-surface-tension liquids.

Evaluate the gas-generation rate, container volume, filling ratio, storage temperature, and expected transportation conditions. The 8000–10000 mL/min/cm² at 7 kPa option is intended for applications requiring high gas-flow capacity.

Tell us the product category, main ingredients, concentration, pH range, viscosity, and surface tension if available. This information helps us recommend a suitable membrane and cap material.

If the package may be tilted or inverted, provide the required water-entry pressure or leakage-test conditions. A balance must be established between airflow and liquid resistance.

Please provide the cap drawing, mounting-hole dimensions, bottle-neck design, installation depth, and dimensional tolerances. XINXIA can evaluate snap-in, press-fit, welded, or customized venting structures.

Samples should be tested with the actual container, closure, filling product, and storage orientation. Recommended evaluations include airflow, leakage, chemical compatibility, temperature cycling, transportation vibration, and long-term storage tests.

Not necessarily. The required airflow depends on the gas-generation rate, container capacity, effective venting area, and pressure limit of the package. Please provide your container and formulation information for evaluation.

A suitable hydrophobic or oleophobic membrane can help resist liquid penetration. However, leakage performance depends on the formulation, surface tension, membrane grade, cap structure, installation quality, and container orientation. Sample testing is strongly recommended.

Yes. The cap diameter, height, mounting structure, venting area, membrane grade, material, and color can be customized according to your drawing or container sample.

Please provide the cap or bottle-neck drawing, required airflow, container volume, filling product information, working temperature, installation method, and expected leakage or water-entry pressure requirement.

Yes. XINXIA can arrange airflow and liquid-barrier testing and assist with membrane selection. Customers should also conduct final validation using the actual formulation and packaging system.

Send XINXIA your container drawing, filling-product information, required airflow, working temperature, and installation dimensions. Our team will recommend a suitable high-flow vent cap and arrange samples for packaging compatibility testing.