Short answer:The airtightness testing method should be selected based on the target leak rate, volume, pressure, and testing cycle time. Water testing is suitable for visual preliminary inspection; pressure drop testing is suitable for mass production screening; the flow method is convenient for quantitative measurement; and helium testing is suitable for detecting lower leak rates and locating micro-leaks.
In what kinds of situations are these silicone parts suitable?
Clearly defining the actual application scenarios helps translate material, structural, and validation requirements into actionable technical specifications.
- Automotive Electronics, Battery Systems, and Connectors
- Medical, Vacuum, Valve Bodies, and Precision Instruments
- Waterproof Enclosures, Piping, and Pressure Components
Parameters to Confirm Before Selecting a Model
We recommend providing the following information before requesting a quote or ordering a sample to minimize the need for repeated prototyping and misunderstandings regarding specifications.
- Define the test pressure, stabilization time, and allowable leak rate
- Methods for Distinguishing Between Positive Pressure, Negative Pressure, and Tracer Gases
- Consider product volume, temperature compensation, and production cycle time
Key Points in Structural Design
Structural dimensions, assembly relationships, and material elasticity must be evaluated together; simply increasing a single parameter generally does not directly improve reliability.
- Establish stable and reliable test interfaces and sealing locations
- Avoid additional compression by the test fixture that could alter the seal condition
- Incorporate the sealing surface, screws, and cable exit into the overall path
Production and Quality Control
Consistency in mass production results from the combined control of material batches, mold condition, molding windows, and inspection methods.
- Establish Standard Parts, Routine Inspections, and Equipment Calibration
- Record the ambient temperature and the stabilization time after pressurization
- Nonconforming products should be tested to identify the actual leak point, rather than simply being retested.
Recommended Verification Items
Validation should be conducted using actual or equivalent operating conditions whenever possible, and functionality should be reconfirmed after aging or cycling.
- Verify the system's sensitivity using known standard leaks
- Comparison of Different Assembly Tolerances and Aging Conditions
- Complete assessments of repeatability, reproducibility, and false-positive rates
Frequently Asked Questions
Does passing the IP waterproofing test mean the unit meets airtightness requirements?
Not necessarily; the test conditions and permissible leakage rates may differ between the two.
Is helium testing definitely better than the pressure drop method?
Helium testing offers high sensitivity but varies in cost and cycle time; the choice should be based on product objectives.
How do I provide information to suppliers?
Please provide 2D or 3D drawings, photos of samples, material and hardness specifications, operating environment, target quantity, acceptance criteria, and a list of compliance documents. Based on this information, Chengxin Silicone Rubber can evaluate the materials, molds, molding process, and validation plan.