Differential Pressure Method Gas Permeability Tester，ASTM D1434 Gas Permeation Analyzer

TheDifferential Pressure Method Gas Permeability Testeris a precision laboratory instrument designed to measure the gas permeability of various materials under controlled differential pressure conditions. You can use it to evaluate O₂, CO₂, N₂, and air transmission rates through films, sheets, high-barrier materials, metal foils, and rubber. This instrument provides reliable data for material selection, quality control, and product development in packaging, engineering plastics, aerospace, and chemical industries.

Applications

The Differential Pressure Method Gas Permeability Tester is suitable for measuring the permeability rates of various gases—including O₂, CO₂, N₂, and air—through materials such as plastic films, composite films, high-barrier materials, sheets, metal foils, and rubber.

Standards

YBB 00082003 Determination of Gas Permeability of Pharmaceutical Packaging Materials

GB/T 1038.1-2022 Plastics - Films and Sheets - Test Methods for Gas Permeability - Part 1: Differential Pressure Method

ASTM D1434 Standard Test Method for Determining Gas Permeability of Plastic Films and Sheets

ISO 2556 Plastics - Determination of gas transmission rate of films and sheets at atmospheric pressure - Pneumatic method

ISO 15105-1 Plastics - Films and sheets - Determination of gas transmission rate - Part 1: Differential pressure method

JIS K7126-A Test method for gas transmission rate of plastic films and sheets by differential pressure method

Features

1.Features standard membrane calibration and external sensor calibration functions

2.Real-time monitoring of test status with full-process data logging ensures complete reproducibility of all test data curves, facilitating post-test evaluation of the testing process

3.Features an open database system for streamlined data analysis

4.Simultaneously measures gas transmission rate, solubility coefficient, and diffusion coefficient of test specimens

5.Three fully independent test chambers enable concurrent testing of three identical or different specimens

6.Wide-range, high-precision temperature and humidity control accommodates diverse testing conditions

7.Offers dual test process evaluation modes: proportional and fuzzy logic

8.Test range can be extended as needed to accommodate high permeability testing requirements

9.Enables data fitting at any temperature, facilitating acquisition of test results under extreme conditions

10.Supports testing of toxic, flammable, and explosive gases (requires modification)

11.Computer-controlled system automates the entire testing process

12.Provides standard membranes for rapid calibration, ensuring accuracy and universality of detection data

13.Equipped with RS232 universal data interface for convenient data transfer

Parameters

Item	Specifications
Measurement Range (Film)	0.01 ~ 50000 cc/m²·24h·0.1MPa
Number of Test Samples	3
Number of Main Sensors	3
Test Mode	Single-chamber independent
Vacuum Resolution	0.1 Pa
Vacuum Degree	< 10 Pa
Temperature Control Range	5°C ~ 65°C
Temperature Control Accuracy	±0.1°C
Test Pressure	Upper test gas chamber: -0.1 MPa ~ +0.15 MPa (standard)Lower permeation gas detection chamber: 0 ~ 1333.33 Pa
Gas Source Pressure	0.4 MPa ~ 0.6 MPa
Test Gas	O₂, N₂, CO₂ or other gases
Gas Inlet Interface	Φ6 mm
Vacuum Pipe Diameter	1/4"
Calibration Method	Standard film calibration, external calibration of vacuum sensor
Sample Thickness	≤3 mm
Sample Size	Φ97 mm
Permeation Area	38.48 cm²
Main Unit Dimensions (L×W×H)	760 mm × 575 mm × 450 mm
Main Unit Weight	88 kg
Power Supply	AC100 ~ 240V 50/60Hz

Accessories

Standard main unit

Temperature control system

Computer with professional software

Dedicated sample extractor

Vacuum grease

Quick quantitative filter paper

Vacuum pump

Test Procedures

1.Prepare and place samples in the upper and lower test chambers; ensure correct positioning and clamping.

2.Evacuate the lower chamber to a preset vacuum level and then apply vacuum to the entire system.

3.Close the lower chamber and introduce the test gas to the upper chamber, creating a stable differential pressure across the sample.

4.Monitor the pressure change in the lower chamber to determine gas transmission rate.

5.Record and save data curves for permeability, solubility, and diffusion coefficients.

6.Repeat for multiple samples if required.

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