Air Permeability Testing Methods
Knowing exactly how fast air passes through a separator sheet is critical for avoiding thermal issues and unexpected short circuits. On production lines, maintaining consistent quality control requires speed, simplicity, and highly capable equipment like the Battery Diaphragm Gas Permeability Tester QT-Q600E.
Standard Gurley Method
This is the preferred choice for the battery manufacturing industry. You force a specific volume of air, exactly 100 mL, through a small, 6.45 cm² section of the plastic sheet under a steady 1.21 kPa of pressure. By recording the exact number of seconds it takes to push through, you get a highly clear, actionable metric.
Most suppliers and buyers rely on a Gurley-type Apparatus, such as the QT-Q600E, because it delivers a universally recognized number that easily meets ISO 5636-5 and TAPPI T460 standards, keeping your specifications completely transparent.
Precision & Seal Integrity
Relying on basic, low-cost air checkers to estimate gas flow can lead to massive issues. When the pathways are incredibly tiny, air molecules bounce off the internal walls, known as Knudsen diffusion, which completely skews cheap measurements.
Furthermore, low-quality seals leak. You need a highly precise testing system like the QT-Q600E, which guarantees superior sealing with air leakage staying strictly under 1.0 mL/h, if you want to avoid highly inaccurate data.
Laminate Theory for Coated Separators
Multilayer separators, such as those combining a plastic base with a thin ceramic layer, can present unique testing challenges. To figure out how much flow resistance each layer contributes, engineers treat the individual layers as a sequence of flow restrictions.
By measuring the total time delay with a highly adaptable Gurley-type Apparatus, you can calculate exactly how much the ceramic coating restricts flow compared to the underlying plastic base. Because the Battery Diaphragm Gas Permeability Tester QT-Q600E allows you to arbitrarily adjust pressure differences anywhere from 0 to 3 kPa, with an incredible accuracy of 0.001 kPa, analyzing complex multi-layer materials becomes remarkably straightforward. You can easily customize the test range from 60 to 12000 s/100mL based on your specific material requirements.
Automated QA & Data Compliance
Translating these scientific principles into daily manufacturing requires fully automatic operation where the testing equipment handles the heavy calculations for you.
Having the Battery Diaphragm Gas Permeability Tester QT-Q600E on the floor gives your technicians a color touch screen for real-time observation and a built-in micro-printer for instant test reports. Plus, its GMP-compliant software provides hierarchical authority management, electronic signatures, and clear audit trails, ensuring your production data remains clean, standardized, and entirely headache-free.
