LBT-0901 Geotextile Membrane Air Permeability Tester (Differential Pressure Method)
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Description
Product Introduction:
A professional gas permeability tester designed for thin-film samples, suitable for determining the gas transmission rate and gas permeance of plastic films, composite films, high-barrier materials, sheets, and metal foils across a range of temperatures. It is also ideal for evaluating the gas barrier properties of various sheet‑like materials, including engineering plastics, rubbers, and construction materials, such as PP sheets, PVC sheets, and PVDC sheets.
Reference standard:
GB/T 1038 “Test Method for Gas Permeability of Plastic Films and Sheets — Pressure Difference Method”
ISO 15105-1 “Plastics — Films and Sheets — Determination of Gas Permeability — Part 1: Differential Pressure Method”
ISO 2556 “Plastics — Determination of gas permeability of films and sheets under atmospheric pressure — Pressure‑difference method”
ASTM D1434 “Standard Test Method for Determining the Gas Permeability of Plastic Films and Sheets”
JIS K7126-1 “Determination of Gas Transmission Rate of Plastic Films and Sheets — Part 1: Pressure Difference Method”
YBB00082003 “Method for Determining Gas Permeation Rate”
Test principle:
Using the differential pressure testing principle, the pre‑treated specimen is placed between the upper and lower test chambers and clamped. First, the low…
The lower chamber is evacuated, after which the entire system is subjected to a vacuum. Once the specified vacuum level is achieved, the lower test chamber is sealed, and a test gas at a predetermined pressure is introduced into the upper (high-pressure) chamber, ensuring a constant, adjustable pressure differential across the sample. Under this pressure gradient, gas permeates from the high-pressure side to the low-pressure side. By monitoring and analyzing the internal pressure on the low-pressure side, the barrier properties of the test sample can be determined.
Product Features:
7-inch industrial touch screen, offering a stylish and convenient human-machine interface.
It can simultaneously determine the gas permeation rate, gas permeability coefficient, solubility coefficient, and diffusion coefficient of the sample.
Wide-range, high-precision temperature control, meeting testing requirements under various experimental conditions.
Offers three test‑procedure judgment modes: proportional, fuzzy, and time‑based.
The measurement range can be extended as needed to meet the requirements of high-transmittance testing.
Supports testing of toxic gases and flammable/explosive gases (customization required)
Uses pneumatic clamping for specimen holding, making it convenient and fast.
The system employs electronic intelligent control, and the entire testing process is completed automatically.
Provides standard membranes for rapid calibration, ensuring the accuracy and versatility of test data.
The product complies with GMP standards and supports multi-level user permissions.
Miniature printer for printing test statistics on sticky notes anytime
Dedicated computer communication software enables real-time display of test results, data analysis and processing, and data storage (optional on the PC).
Equipped with a universal USB data interface for convenient data transfer.
Technical specifications:
| Parameter Category | Parameter content |
| Test Scope | 0.05 ~ 50,000 cm³/m²·24h·0.1MPa (standard) |
| Number of test specimens | 1 item |
| Vacuum resolution | 0.05 Pa |
| Test chamber vacuum level | <10 Pa |
| Temperature control range | 15 ~ 60℃; 5~95℃ (optional) |
| Temperature control accuracy | ±0.1℃ (optional ±0.05℃) |
| Specimen dimensions | Φ95 mm |
| Through the area | 33.18 cm² |
| Test gas | Inert gases such as O₂, N₂, and CO₂ (CH₄ and H₂ available as optional options) (gas supply to be provided by the user) |
| Test pressure | 0.1 MPa ~ 0.15 MPa |
| Interface dimensions | Φ6 mm polyurethane tube |
| Power supply | AC 220V 50Hz |
| External dimensions | 400 mm (W) × 450 mm (D) × 420 mm (H) |
| Host net weight | 30 kg |
Sample preparation:
1. Test specimens shall be free of wrinkles, creases, pinholes, and stains; when taking samples, filter paper or A4 paper must be placed beneath the sample.
2. The test specimen shall meet the specified minimum dimensions and be easy to cut and seal.
3. During testing, the direction of gas permeation shall be clearly defined.
4. The specimen thickness shall be uniform, in accordance with the relevant provisions of ISO 4593.
5. Preliminary sample preparation: Place the sample in a desiccator for conditioning for at least 48 hours, or subject it to the prescribed treatment specified in the product standard.
6. Conditioning of the test specimens shall be carried out in accordance with the relevant standards specified in GB/T 2918.
7. Specimen clamping is pneumatic.
8. Use of the grease‑control ring;
Before performing the sampling, apply vacuum grease to the non‑permeable gas‑passing area of the lower chamber of the test cell. If the grease is applied to the permeable gas‑passing region, it may adversely affect the test results; therefore, care must be taken during greasing to avoid contaminating the test area. For novice users, the greasing process can be facilitated by using the grease‑application control ring. To do so, insert the small shaft at the bottom of the control ring into the central hole of the lower chamber of the test cell, then evenly spread the vacuum grease on the area outside the control ring. A 65 mm‑diameter chemical analysis filter paper should be placed beneath the test sample to ensure uniform gas permeation.
It should be specially noted that, throughout the entire testing process, users must strictly ensure that no foreign objects or liquids enter.
Ensure that the central hole in the lower chamber of the test chamber remains unobstructed to prevent blockage, maintain the accuracy of test data, and safeguard the equipment’s service life. When wiping the test chamber or removing residual vacuum grease, use a clean, lint‑free silk cloth. When cleaning with alcohol, do not pour it directly onto the test chamber; instead, soak the silk cloth and gently wipe the surface.
Standard configuration: host unit, professional software, RS‑485 communication cable, miniature printer, sample sampler, filter paper sampler, vacuum grease, rapid quantitative filter paper, vacuum pump, and temperature control device.
Optional accessories: computer, vacuum pump oil, oxygen pressure regulator, and water bath temperature control unit (with cooling function).
Note: The air supply inlet for this unit is a Φ6 mm polyurethane tube; the air source must be provided by the user.
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