2026 - Precision Engineering Airtight

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

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.

Q&A: Can Domestic Leak Testers Replace Imported Equipment? A Guide to Rational Evaluation

This article explains how domestic alternatives to industrial leak detection equipment are becoming a hot topic in manufacturing for reducing costs and improving efficiency, but the discussion often gets bogged down in two extremes: “catching up completely” or “not daring to take risks.” In fact, the answer depends on the specific scenario: the true value of substitution lies in eliminating hidden friction costs—such as spare parts cycles and technical support—and gaining comprehensive adaptation capabilities, including parameter switching, system integration, and customization, rather than simply replacing a single instrument.

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

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.

The Application of Jingcheng Engineering’s Airtight Equipment in Automated Workshops

Quick Q&A: What Is a Leak Tester Used For? A Must-Read Guide for Beginners—From Principles to Applications

This article describes how airtightness testers use four methods—positive pressure, negative pressure, differential pressure, and flow rate—to perform “controlled gas testing” on products, thereby detecting minute leaks that are invisible to the naked eye. When selecting a model, higher accuracy is not necessarily better; rather, the equipment should be matched to the product’s structure and permissible leak rate. Only through the use of custom fixtures and sample validation can a stable, traceable quality system be established.

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.

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.

A die-cast part with an intact exterior does not necessarily mean it is completely sealed internally

Quick Q&A: How can you quickly identify minor defects—such as porosity, sand holes, and cracks—in die-cast parts?

This article introduces the principles and methods of airtightness testing for die-cast parts. Differential-pressure leak detectors determine whether pores, sand holes, or cracks have formed through-leaks by comparing the pressure difference between a reference part and the part under test; they do not detect all internal defects. In practice, the custom tooling, the balancing phase, and the validation of reference parts are most often overlooked. A mature quality control plan should combine non-destructive testing, airtightness testing, and automated 100% inspection.

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?

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.

JC-WG200 Multifunctional Test Platform for Waterproof and Breathable Membranes (2)

Q&A: How to Efficiently Inspect Breathable Films of Various Specifications? Jingcheng Engineering’s Single Machine Supports Multiple Product Models

This article introduces the Jingcheng Engineering JC-WG200 Comprehensive Tester for Waterproof and Breathable Membranes: Addressing the challenge of having to verify the two independent properties—air permeability and water pressure resistance—of ePTFE products separately, this solution uses “one device + multiple test fixtures + independent parameters” to enable testing of multiple products with a single machine, saving both costs and space. It also supports upgrades to automated production lines, providing an efficient and reliable testing solution for R&D, quality control, and procurement.

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!

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.