Pressure Difference Method for Helium Permeation Testing in Graphene Films

Product Description

Product Features

• Gas transmission rate, solubility coefficient, diffusion coefficient and permeability coefficient of the specimen could be obtained at one operation
• 3 distinct or equivalent specimens could be tested individually with independent test results at one operation
• Wide range and high precision temperature and humidity control to meet various test conditions
• The instrument comes with two test modes: proportional mode and standard mode
• Test range could be extended based on user requirements to test the materials with high permeability
• Test results could be easily obtained even at extreme condition by data fitting function, which could work at any temperature
• The instrument could be used to test poisonous, inflammable, and explosive gases (customization required)
• The instrument is controlled by computer and test process is automatic
• Reference film for fast calibration to ensure accurate and universal test data
• Standard RS232 port for convenient data transfer
• Supports LystemTM Lab Data Sharing System for uniform management of test results and test reports

Principle

The pre-conditioned specimen is mounted in the gas diffusion cell as to form a sealed barrier between two chambers. The lower-pressure chamber is firstly evacuated, followed by the evacuation of the entire cell. A flow of gas is thereafter introduced into the evacuated higher-pressure chamber and a constant pressure difference is generated between two chambers. The gas permeates through the specimen from the higher pressure side into the lower side. The gas permeability and other barrier properties of the specimen can be obtained by monitoring the pressure changes in the lower chamber

Standards

This test instrument conforms to the following standards:
ISO 15105-1, ISO 2556, GB/T 1038-2000, ASTM D1434, JIS K7126-1, YBB 00082003

Applications

This test instrument is applicable to the determination of gas permeability of:

Basic Applications
Films Including plastic films, plastic composite films, paper-plastic composite films, coextruded films, aluminized films, aluminum foils, aluminum foil composite films and many others
Sheeting Including engineering plastics, rubber and building materials, e.g. PP, PVC and PVDC
Extended Applications
Various Gases Test the permeability of various types of gases, e.g. O2, CO2, N2, Air and He
Inflammable, Explosive Gases Test the permeability of inflammable and explosive gases
Biodegradable Films Test gas permeability of various sorts of biodegradable films, e.g. starch-based biodegradable bags
Materials for Aerospace Usage This instrument can test the Helium permeability of airship gas bags
Paper and Paper Board Test gas permeability of paper and paper-plastic composite materials, e.g. aluminized paper for cigarette packages, Tetra Pak sheeting, paper bowls for instant noodles and disposable paper cups
Paint Films Test gas permeability of substrates coated paint films
Glass Fiber Cloth and Paper Including glass fiber cloth and paper materials, e.g. Teflon paint cloth, Teflon welding cloth and Teflon silicon rubber cloth
Soft Tube Materials for Cosmetics Including various types of cosmetic tubes, aluminum-plastic tubes and toothpaste tubes
Rubber Sheeting Including various sorts of rubber sheeting, e.g. car tires

Technical Specifications

Specifications	Film Test
Test Range	0.0550,000 cm3/m224h0.1MPa (standard volume)
	At least 500,000 cm3/m224h0.1MPa (extended volume)
Number of Specimens	3 (with independent test results)
Vacuum Resolution	0.1 Pa
Vacuum Degree of Test Chamber	<20 Pa
Temperature	5C 95C
Accuracy	0.1C (standard)
Humidity	0%RH, 5%RHi95%RH (automatic humidification function under 1040 can be customized)
Accuracy	1%RH
Specimen Size	I97 mm
Test Area	38.48 cm2
Test Gas	O2, N2 and CO2 (outside of supply scope)
Test Pressure	10kpa200kpa
Gas Supply Pressure	0.4 MPa 0.6 MPa
Port Size	I6 mm PU Tubing
Instrument Dimension	760 mm (L) x 575 mm (W) x 450 mm (H)
Power Supply	220VAC 50Hz / 120VAC 60Hz
Net Weight	88 kg

Configurations

Standard Configurations

Instrument, Constant Temperature Control Device, Professional Software, Round Sample Cutter, Vacuum Grease, Fast Quantitative Filter Paper and Vacuum Pump(Imported)

Optional Parts

Blades for Sample Cutter, Vacuum Grease, Vacuum Pump Oil, Fast Quantitative Filter Paper

Note

1. The gas supply port of the instrument is I6 mm PU tubing;
2. Customers will need to prepare for gas supply and distilled water.

Highly Accurate Helium Permeation Measurement

This permeation tester employs the pressure difference method and ensures precise detection of ultra-low helium transport rates through graphene films. Users benefit from automated leak calibration, microprocessor-based automatic control, and an advanced PC-based analysis suite, resulting in repeatable and trustworthy results. With a measuring range from 109 to 103 cccm2s1Pa1 and resolution as fine as 0.001 cccm2s1Pa1, it meets rigorous research and industry standards.


Intuitive Operation and Broad Data Management

The tester features a digital LCD display for real-time test monitoring, integrated data logging, and storage capacity for up to 10,000 tests. Operation is streamlined by the quick-clamp sample holder and user-friendly software, enabling efficient test setup and comprehensive data analysis directly on your PC. Interface options include USB and RS232 for versatile connectivity.


Rugged Design with Advanced Safety Features

Constructed from corrosion-resistant stainless steel (SS 316L) and utilizing Viton O-ring seals, this bench-top device is engineered for durability. Safety is prioritized through overpressure relief and emergency stop features, while the quiet operation (<40 dB ambient noise) supports a comfortable laboratory environment. Compliance with ISO 15105-1 ensures suitability for regulated testing scenarios.