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Industry News

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How to Test for Leaks in Product Seals Without Contacting Water: The Principles and Limitations of Air Leak Testers

2026-10-30

This article explains the principle behind airtightness testers, which detect product leaks by measuring changes in air pressure or flow rate within a sealed chamber. It also presents a case study of a road surveying instrument that measured 1 Pa at 15 kPa and passed a water immersion test with no bubbles, demonstrating that the two methods can be used for cross-validation. The article also emphasizes that pass/fail thresholds must be set according to standards, and that resolution is not equivalent to accuracy; airtightness testing is suitable for mass-production screening and traceability, while the water immersion method is better suited for visually locating leak points.

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New Energy Electric Vehicles

A Comprehensive Guide to Power Battery Leak Testing: National Standard Updates, Testing Methods, and Selection Guidelines

2026-10-23

This article focuses on the implementation of the new national standard GB 38031-2025 and systematically outlines the entire process of airtightness testing for power battery packs: It analyzes the fundamental differences between type testing and production line testing, compares the applicable scenarios for the four methods—direct pressure, differential pressure, flow-based, and helium leak testing—provides recommendations for selecting equipment for different components, and emphasizes that parameter settings must adhere to technical agreements. The paper also advocates for the objective evaluation of equipment through sample validation and repeatability testing, thereby offering a practical guide for production line acceptance.

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Jingcheng Engineering’s Liquid-Cooling Testing Solution System (2)

A Comprehensive Guide to Liquid-Cooled Leak Testing Solutions: From Testing Principles and Industry Standards to Automated Mass Production

2026-10-16

This article focuses on airtightness testing of liquid-cooling systems and points out that leaks are a critical weakness in liquid-cooled heat dissipation. The article compares the applicable scenarios for four testing methods—direct pressure, differential pressure, helium mass spectrometry leak detection, and water immersion bubble testing—outlines the scope of relevant industry standards for 2024–2026, and emphasizes that test pressure, equilibration time, and leak limits must be scientifically determined based on the actual product specifications— —Passing an airtightness test does not guarantee product quality; a comprehensive validation system must also include follow-up tests such as flow rate measurement, pressure endurance testing, and environmental stress testing.

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2. Negative Pressure Air Leak Tester

What is the pressure limit for a negative-pressure leak detector? Jingcheng Engineering provides a detailed explanation of the vacuum and pressure equalization testing procedures.

2026-10-09

This article begins by addressing the anomalous reading of “-104 kPa” encountered by engineers, pointing out that the limit for negative gauge pressure is the local atmospheric pressure; values below -100 kPa are physically impossible and are typically caused by confusion regarding pressure references or sensor drift; Based on the national standard GB/T 25752, it explains the principles of negative pressure leak detection, the testing process, and common sources of interference, emphasizing that equipment selection should focus on the device’s actual performance and repeatability rather than peak readings displayed on the screen.

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Liquid-cooled systems must undergo air-tightness testing

Liquid-Cooled Leak Testing: With the National Standard Set to Take Effect in 2026, How Should Companies Establish a Mass Production Quality Inspection System?

2026-09-29

This article outlines the key points of airtightness testing for liquid-cooled data centers: The new national standard set to take effect in 2026 only establishes a framework, with leakage rates to be determined by the product manufacturer; it compares the applicable scenarios for four testing methods—direct pressure, differential pressure, flow rate, and helium leak testing; it points out that fluctuations in results are often due to system factors such as test fixtures and temperature rather than the instruments themselves; It emphasizes that companies should establish their own testing specification matrices to translate standards into stable, traceable mass-production testing capabilities.

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Training and explaining the instrument to customers

A Comprehensive Analysis of the Causes of Negative Readings in Differential Pressure Leak Testing: Jingcheng Engineering Identifies Four Major Systemic Sources of Interference!

2026-09-19

This article analyzes the causes of negative readings in differential pressure-based airtightness testing and proposes solutions. The article points out that negative readings do not indicate product leakage or instrument malfunction, but rather result from the pressure at the reference end dropping faster than at the test end, causing the pressure comparison between the two sides to be reversed. There are four main causes of negative values: micro-leaks in the reference component or aging seals; excessive differences in volume between the product under test and the reference chamber; pressure desynchronization on both sides due to temperature changes; and slight deformation of fixtures or tubing under pressure.

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Airtightness Testing_LED Lamps Case

When the same product is tested twice, the results get lower each time—it’s not a problem with the airtightness equipment; it’s a flaw in the method.

2026-09-11

This article explains that the phenomenon of initially high data readings followed by a gradual decrease in airtightness testing is not due to instrument malfunction, but rather to an improper testing method. The root cause lies in the elastic deformation that occurs when the product is pressurized for the first time; if testing continues without sufficient depressurization and recovery, the stress release process in the material will be superimposed on the leakage values, resulting in a systematic drift in the data. Standard procedures require complete depressurization, allowing sufficient recovery time, controlling temperature, and ensuring fixture consistency; only under these conditions can the repeatability of the equipment be truly evaluated.

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Jingcheng Engineering’s Battery Housing Inspection Solution

Air Tightness, Hydrostatic Pressure, and Flow Rate Testing for New Energy Battery Cases: How Many Pieces of Equipment Are Needed for These Three Types of Tests?

2026-09-04

This article presents a comprehensive solution for inspecting new energy battery casings and points out that airtightness testing alone is insufficient to meet the quality requirements for complex casings. For structures such as battery top and bottom covers, it is recommended to use Jingcheng Engineering’s dual-channel airtightness tester in conjunction with a dual-station fixture to improve mass production efficiency; at the same time, separate equipment for testing the water pressure resistance and flow rate of waterproof-breathable membranes must be configured. The article also emphasizes the importance of automated decision-making logic, data traceability management, and solution scalability, and outlines four core dimensions for evaluating testing solutions.

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A Comprehensive Testing Protocol for Waterproof and Breathable Membrane Materials

Can a waterproof and breathable membrane water-barrier tester only measure one pressure level? Jingcheng Engineering’s multi-stage pressure solution is here.

2026-08-28

This article introduces the multi-stage pressure water-blocking and air-permeability tester for waterproof and breathable membranes launched by JCGK. This device overcomes the limitations of traditional single-pressure-point testing by automatically performing continuous multi-stage pressure testing. It simultaneously records pressure, leakage volume, and results for each stage, and supports visual analysis using an electron microscope, providing more comprehensive performance boundary data for the R&D validation and quality control of waterproof and breathable membranes.

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