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Key: test item, instrument name, total nonvolatile migration, gravimeter, moisture permeameter

Product

WVTR Permeation Tester - Gravimetric Method

STW-8-120-G
Focusing on packaging and material testing technology, we are committed to quality control in industries such as healthcare, pharmaceuticals, food, packaging, textiles, and new materials. Our products are widely used in enterprises, testing institutions, universities, and research institutes.

Category:

Permeation Analyzer

Water Vapor Transmission Rate Analyzer

WVTR Tester- Gravimetric Method

Water Vapor Transmission Rate Tester

---Gravimetric Cup Method (ASTM E96) WVTR Analyzer

Overview:

The LabStone Gravimetric Water Vapor Transmission Rate Tester is designed for determining water vapor transmission properties of films, sheets, fabrics, construction materials, leather, paper and containers using the internationally recognized cup method.

Based on the gravimetric principle, the instrument continuously measures weight loss caused by water vapor transmission under controlled temperature, humidity and airflow conditions.

The system supports both upright cup and inverted cup testing configurations, making it suitable for a wide range of moisture barrier and breathable material evaluations.

Why Use the Gravimetric Method?

Although modern sensor-based WVTR technologies provide fast measurements, the gravimetric method remains one of the most widely accepted reference methods worldwide.

Many international standards and regulatory specifications continue to require or recognize gravimetric testing due to its:

Direct measurement principle
Excellent traceability
Broad material compatibility
Regulatory acceptance
Long-term stability

For many building materials and textile applications, the gravimetric method remains the preferred testing approach.

Function:

Determining water vapor transmission rate, permeability characteristics of materials and containers.

Suitable for: Film, sheet, container, and construction material of plastic, textile, leather, and metal.

Working Principle:

The instrument uses the Gravimetric Cup Method.

Water is placed inside a test cup and the specimen is sealed over the opening.

The cup is then placed inside a controlled environmental chamber.

A vapor pressure difference develops across the specimen, causing water vapor to permeate through the material.

The system continuously measures weight loss of the cup using a high-precision analytical balance.

The software automatically calculates:

Water Vapor Transmission Rate (WVTR)
Water Vapor Permeability
Moisture Transmission Characteristics

Both upright cup and inverted cup methods are supported.

Compliant Standards:

ASTM E96 / E96M
ISO 2528
TAPPI T464
ASTM D1653

General Chapter 4010, Chinese Pharmacopoeia Volume IV, Determination of Water Vapor Transmission Rate

YBB 0009-2003-2015
GB/T 1037
GB/T 17146
GB/T 12704.1
GB/T 12704.2
GB/T 21332
QB/T 2414
YY/T 0471

Key Features:

ASTM E96 Compatible Design

Supports internationally recognized cup method testing.

Ideal for laboratories requiring compliance with ASTM E96 and related standards.

Twelve Independent Test Stations

The system can test up to 12 specimens simultaneously.

Benefits include:

Higher throughput
Better laboratory efficiency
Reduced project time
Improved comparative testing

Integrated Precision Balance System

Features:

210 g weighing range
0.1 mg resolution

Provides accurate gravimetric measurement throughout the test.

Automatic Humidity Control

Humidity range:

5% RH – 50% RH

Automatic humidity regulation ensures stable testing conditions.

Uniform Airflow Technology

Dual-plane spiral airflow design ensures:

Uniform air velocity
Stable humidity field
Stable temperature field

Improving repeatability and inter-station consistency.

Automatic Desiccant Regeneration

Integrated air dryer automatically regenerates desiccant.

Benefits:

Reduced maintenance
Lower operating cost
Improved stability

Balance Protection Technology

Patented protection system shields the balance from:

Heat
Moisture
Corrosive environments

Extending service life and maintaining accuracy.

Specification

Name	Parameter	Name	Parameter
Measure Range	Film: 0.05~10,000 g/m²•24h Container: 0.0002-30 g/pkg•24h	Measure Error	Fim: 0.05 g/ m²•24h Container: 0.0002 g/pkg•24h
Balance Range	210 g	Balance Resolution	0.1 mg
Temp Range	15-45 ℃	Temp Error	±0.3 ℃
Humidity Range	5% -50%	Humidity Error	±2% RH
Flow Rate	0.03 - 2.5 m/s	Air Pressure	>0.3 MPa
Test Area	33 cm²(can be customized)	Specimen Thickness	<3 mm
Specimen Weight	<180g	Custom Cup Height	<150 mm
Power Supply	AC220V /110V ;50/60Hz	Power Consumption	<2 kW
Specimen Count	12
Size	898×727×677 mm (L×B×H)
Net Weight	98 kg

Configuration: Principal machine, computer, air dryer, professional software, test cupes, Correction weight(200g), Specimen Sampler.

Optional: GMP Software module, asphalt-seal cup.

Self-Supply: Compressed air, distilled water.

Application Areas

Building Materials Industry

One of the largest application areas for gravimetric WVTR testing.

Suitable for:

Waterproof membranes
Roofing membranes
Building wraps
Vapor barriers
Thermal insulation materials
Construction films
Waterproof coatings

Typical objective:

Evaluate moisture transfer performance and condensation control capability.

Textile and Apparel Industry

Suitable for:

Outdoor fabrics
Sportswear fabrics
Functional textiles
Breathable membranes
Protective clothing
Medical textiles

Common testing purpose:

Determine fabric breathability and moisture management performance.

Medical Protective Products

Used for:

Surgical gowns
Isolation gowns
Protective clothing
Medical laminates

Supports testing according to relevant medical material standards.

Flexible Packaging Industry

Applicable to:

Plastic films
Composite films
Paper packaging
Sustainable packaging materials

Used for moisture barrier evaluation and shelf-life studies.

Paper and Packaging Materials

Suitable for:

Coated paper
Corrugated packaging
Specialty papers
Fiber-based packaging

Asphalt and Waterproofing Industry

Used to evaluate:

Asphalt membranes
Waterproof coatings
Roofing systems

Optional asphalt sealing cups are available.

Industries Served

Building Material Manufacturers
Roofing Material Producers
Waterproofing Material Companies
Textile Manufacturers
Sportswear Brands
Medical Protective Product Manufacturers
Flexible Packaging Manufacturers
Paper Packaging Companies
Universities and Research Institutes
Third-Party Testing Laboratories

Frequently Asked Questions(FAQ)

What is the gravimetric method for WVTR testing?

The gravimetric method determines water vapor transmission by measuring the weight change of a test cup under controlled environmental conditions.

What is the difference between ASTM E96 and sensor-based WVTR testing?

ASTM E96 uses direct mass loss measurement, while sensor-based methods detect transmitted moisture using specialized sensors.

Which industries commonly use ASTM E96 testing?

Building materials, textiles, medical products, packaging materials and paper products.

What is the difference between upright cup and inverted cup methods?

The two configurations create different humidity gradients and are selected according to material type and test requirements.

Why is ASTM E96 still widely used?

Because it is highly accepted worldwide and suitable for a broad range of materials, especially building and textile products.

Can breathable fabrics be tested?

Yes. The instrument is widely used for measuring moisture vapor transmission of functional textiles.

Can construction membranes be tested?

Yes. Waterproof membranes, vapor barriers and roofing materials are among the most common applications.

How many specimens can be tested simultaneously?

Up to 12 specimens can be tested in one run.

Does this product have other names?

English

Gravimetric WVTR Tester
Gravimetric Water Vapor Transmission Rate Tester
Cup Method WVTR Tester
ASTM E96 Water Vapor Transmission Rate Tester
Water Vapor Permeability Tester
Moisture Vapor Transmission Tester
Moisture Permeability Analyzer
Water Vapor Permeability Tester
Building Material Moisture Testing
Textile Moisture Vapor Transmission Tester
Waterproof Membrane WVTR Test
Moisture Barrier Testing Equipment
Water Vapor Permeation Tester

German

Gravimetrisches Wasserdampfdurchlässigkeitsprüfgerät

French

Analyseur Gravimétrique de Transmission de Vapeur d’Eau

Spanish

Analizador Gravimétrico de Permeabilidad al Vapor de Agua

Portuguese

Testador Gravimétrico de Permeabilidade ao Vapor de Água

Japanese

重量法水蒸気透過率試験機

Function
Determining water vapor transmission rate, permeability characteristics of materials and containers.
Suitable for: Film, sheet, container, and construction material of plastic, textile, leather, and metal.

Principle
Method: water method, upright cup and inverted cup supported.
Water filled into test cup; mount the specimen on test cup and place it into test chamber; the temperature, the relative humidity and the wind speed inside test chamber are controlled to appointed value; the water vapor pressure difference between the outer and the inner of test cup will drive the water vapor permeating the specimen, the test cup’s weight will decrease; weighing the test cup and calculate the permeability characteristics of the specimen.
Standards
GB/T 1037、YBB 00092003、ASTM E96、ISO 2528、GB/T 17146、GB/T 12704、GB 19082、GB/T 21332、QB/T 2414、TPPI T464、ASTM D1653、YY0471.2、DIN 53122。
Characteristics
- Conplies to Standards of China, USA, ISO Strictly;
- Test error attenuates to zero and the maximum error can be estimated;
- Patented permeable cup: No plastic on the exterior of the cup(to avoid water absorption), non-slip design (no distortion of the sample), reliable sealing.
- Temperature and Humidity: The temperature is controlled by the TEC module and the humidity is controlled by dried air automatically;
- Uniform airspeed: Double-plane spiral circulation air, uniform airspeed, humidity field, and temperature field.
- Patent balance protector: moisture-proof, heat-proof and erosion-proof to protect the analytic balance;
- Air Dryer: the desiccant is re-dried automatically and its replace period is about 6 months;
- Work environment: indoors without constant temperature or humidity requirement (low cost), the test result is independent from the environment.
- Automatic：no mechanical knob; one button to test; terminating test and saving data automatically;
- Self-diagnosing：diagnosing when power-on and avoiding working within faults;
- Software: graphical, all-time, and all-element monitoring and recording, multi-format reports;
- Data security: conform to requirements of the GMP “computerized system”.

Specification

Name	Parameter	Name	Parameter
Measure Range	Film: 0.05~10,000 g/m²•24h Container: 0.0002-30 g/pkg•24h	Measure Error	Fim: 0.05 g/ m²•24h Container: 0.0002 g/pkg•24h
Balance Range	210 g	Balance Resolution	0. 1 mg
Temperature Range	15-45 ℃	Temperature Error	±0.3 ℃
Humidity Range	5% -50%	Humidity Error	±2% RH
Airspeed	0.03 - 2.5 m/s（stepless speed regulation）	Air Pressure	>0.3 MPa
Test Area	33 cm²（Other areas can be customized）	Specimen Thickness	<3 mm
Specimen Weight	<180 g	Custom Cup Height	<150 mm
Power Supply	AC220V /110V ;50/60Hz	Power Consumption	<2 kW
Model	Model
Model	STW-8-120-G
Specimen Count	12
Size (L×B×H) mm	898×727×677
Net Weight	98 kg

Configuration: Principal machine, computer, air dryer, professional software, test cupes, Correction weight(200g), Specimen Sampler.
Optional: GMP Software module, asphalt-seal cup.
Self-Supply: Compressed air, distilled water.

Keywords:

Water Vapor Transmission Rate Analyzer

Water Vapor Transmission Tester for Building Materials - Cup Method