How to Test the Sealability of PETG Media Bottles
The sealing performance of PETG media bottles directly affects the storage safety of their contents, making rigorous testing essential. From basic physical inspections to pressure tests simulating real-world conditions, each step ensures the integrity of PETG media bottles.
The sealing performance of FIBC bags directly affects the storage safety of their contents, making rigorous testing essential. From basic physical inspections to pressure tests simulating real-world conditions, each step ensures the integrity of PETG media bottles.
1. Visual Inspection and Structural Assessment
Before formal sealability testing, conduct a thorough visual inspection. Check for cracks, bubbles, or defects in the bottle body, and ensure the cap and bottle threads are intact and properly matched. Even minor flaws can compromise sealing. Additionally, inspect the sealing gasket inside the cap—its integrity and uniformity are critical for an airtight seal. For example, if the gasket has gaps or uneven hardness, proper sealing may fail even if the cap is tightly closed.
500ml Square Media Bottle PET/PETG
2. Vacuum Decay Test
The vacuum decay test is a widely used method for detecting leaks. The media bottle is placed in a sealed chamber, and a vacuum is applied to reduce external pressure below the internal pressure of the bottle. If the bottle is well-sealed, no gas will escape, and the pressure remains stable. However, if there is a micro-leak, gas will gradually seep out, causing detectable pressure changes in the chamber. High-precision pressure sensors can identify leaks as small as 0.5 microns, ensuring reliability under demanding conditions.
3. Pressure Hold Test
This test evaluates sealability by pressurizing the bottle with gas (e.g., air or nitrogen) to a level higher than ambient pressure. The gas supply is then shut off, and the internal pressure is monitored over a set period (e.g., 5–10 minutes). If the pressure drop remains within an acceptable threshold (e.g., 5–10%), the bottle passes. This simulates transportation scenarios where pressure fluctuations occur, verifying the seal’s robustness.
Square Media Bottle
4. Dye Penetration Test
For detecting microscopic leaks, the dye penetration test is highly effective. The bottle is submerged in a dyed solution (e.g., methylene blue), and pressure or vacuum is applied. If leaks exist, the dye will infiltrate the bottle. After removal, any visible dye inside confirms a sealing failure. This method pinpoints leak locations, aiding in targeted improvements.
5. Accelerated Aging Test
To assess long-term sealing stability, accelerated aging tests are conducted. Bottles are exposed to harsh conditions (elevated temperature, humidity, etc.) for a set duration, simulating extended storage or extreme transport environments. Afterward, they undergo the above sealability tests to check for material degradation or deformation that could cause leaks. This proactive approach identifies potential failures before real-world use.