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

Product

Water Vapor Transmission Rate (WVTR) Tester-Cup Method

W-B-121-G WVTR tester for films, packaging & building materials. ASTM E96 & ISO 2528 compliant. 0.05 g/m²·24h accuracy, fog-free humidification, 12 stations.
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.

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Permeation Analyzer

Water Vapor Transmission Rate Analyzer

WVTR Tester- Gravimetric Method

Water Vapor Transmission Rate (WVTR) Tester - Cup Method

Overview

LabStone provides precise measurement solutions for assessing the barrier properties of packaging materials. The W-B-121-G Water Vapor Transmission Rate (WVTR) Tester is a professional-grade instrument designed to evaluate the moisture barrier performance of films, sheets, laminates, and finished packages.

Utilizing the gravimetric cup method, the W-B-121-G delivers critical barrier data required for material science research, quality control, and regulatory compliance. It is fully compliant with international standards including ASTM E96, ISO 2528, and the Pharmacopoeia, making it an ideal solution for the pharmaceutical, food and beverage, medical device, and advanced materials industries.

Key Applications

Flexible Packaging Films: Measurement of WVTR for BOPP, BOPET, PE, CPP, PVDC, and aluminum-laminated films.
Pharmaceutical Packaging: Testing of blister lidding foils, strip packaging, and pouches for moisture-sensitive APIs (per Pharmacopoeia and YBB standards).
Finished Containers: Evaluation of moisture transmission through bottles, blister packs, and trays (using inverted cup mode).
Building Materials: Determination of water vapor transmission for vapor retarders, insulation boards, waterproof membranes, and gypsum boards.
Specialty Materials: Testing of nonwovens, textiles, leather, and composite barriers.

Measured Parameters:

Water Vapor Transmission Rate (WVTR)
Water Vapor Permeance
Water Vapor Permeability Coefficient

Working Principle

The W-B-121-G operates on the Gravimetric Cup Method, automatically performing the "Dry-Cool-Weigh" cycle required by international standards.

1.Preparation: A test cup is filled with either a desiccant (for the Desiccant Method) or distilled water (for the Water Method).

2.Mounting: The specimen is sealed over the mouth of the cup using a hot wax edge-seal to prevent edge leakage. The cup can be tested in an upright or inverted position depending on the sample type (sheet vs. finished container).

3.Conditioning: The sealed cup is placed in the instrument’s climate-controlled chamber. The system maintains a constant temperature and a specific humidity differential across the specimen, driving the diffusion of water vapor.

4.Measurement: A high-precision analytical balance periodically weighs the cup.

Desiccant Method: Mass increases as moisture penetrates the film.
Water Method: Mass decreases as moisture evaporates through the film.

5.Calculation: The system plots the weight change over time and calculates the WVTR and permeability coefficients based on the steady-state slope.

Compliance Standards

ASTM E96 / E96M: Standard Test Methods for Water Vapor Transmission of Materials

ISO 2528: Sheet materials - Determination of water vapour transmission rate (gravimetric method)

Pharmacopoeia: Method for Determination of Water Vapor Permeability

DIN 53122-1: Determination of water vapour transmission of plastic film, rubber sheeting, and other sheet materials

TPPI T464: Standard Test Method for Hygroscopic Transport Properties of Paper and Paperboard

ASTM D1653: Standard Test Method for Water Vapor Transmission Rate Through Organic Coating Films

YY 0471.2: Test Method for Permeability of Water Vapour for Surgical Implants

GB/T 1037: Plastics - Determination of water vapour transmission rate - Cup method

GB/T 17146: Test method for water vapor transmission performance of building materials

GB/T 12704: Textiles - Determination of water vapour transmission rate

YBB 00092003: Test method for water vapor permeability of laminated films for pharmaceutical packaging

GB 19082: Protective clothing for medical use - Water vapor performance

GB/T 21332: Determination of steady-state moisture transmission properties of thermal insulation materials

QB/T 2414: Test method for water vapor transmission rate of leather

Key Features

Dual-Method Integration: Supports both Water Method (Loss) and Desiccant Method (Gain) in a single unit, allowing for comprehensive material characterization.
Ultra-High Precision: Measurement error as low as 0.05 g/m²·24h. The high-resolution balance (0.1 mg) and temperature control (±0.3°C) ensure data stability over extended test durations.
Fog-Free Humidification: Utilizes pure steam injection directly into the test chamber. Unlike ultrasonic humidifiers, this prevents water droplet fallout ("false penetration"), ensuring data integrity.
Internal Humidification System: Moisture bypasses the low-temperature zone, preventing condensation and ensuring stable high humidity (up to 90% RH).
Patented Permeation Cup: The cup features a non-slip, non-absorbent design with no external plastic parts to interfere with measurements. The hot wax sealing ensures zero edge leakage.
Environmentally Independent: Built-in temperature and humidity control eliminates the need for a costly external constant-temperature/humidity laboratory. Test data remains unaffected by ambient fluctuations.
Patented Balance Protection: Thermal isolation and moisture-proof technology safeguards the high-precision balance, extending its service life.
Uniform Airflow: Dual-plane spiral circulation ensures exceptional homogeneity of temperature, humidity, and air velocity across all 12 test stations.
Fully Automated Operation: One-key start, automatic data acquisition, and real-time graphical display. The system automatically terminates and saves data upon test completion.
Low Maintenance: Automatic water replenishment and desiccant regeneration cycles reduce manual intervention (desiccant replacement typically once per year).
Data Integrity (Optional): Optional GMP Computerized System Module provides User Management, Role-Based Access Control, Electronic Signatures, and Audit Trails compliant with 21 CFR Part 11.

Technical Specifications

Parameter	Value	Parameter	Value
Measurement Range	Film: 0.05-10,000 g/m2•24h, Container: 0.0002-30 g/pkg•24h	Measurement Error	Film: 0.05 g/ m²•24h, Container: 0.0002 g/pkg•24h
Balance Range	220 g	Balance Resolution	0.1 mg
Temperature Range	15-45℃	Temperature Error	±03 ℃
Humidity Range	10% - 90%	Humidity Error	±2% RH
Airspeed	0.03 - 2.5 m/s（stepless speed regulation）	Air Pressure	>0.3 MPa (self-supplied)
Test Area	33 cm²（Other areas can be customized）	Sample Thickness	< 3mm
Custom Cup Height	<150 mm
Power Supply	AC220V /110V ;50/60Hz	Power	＜2,000 W
Model	Model
Model	W-B-121-G
Sample Quantity	12
Mainframe Size	898×727×677 mm (LxBxH)
Net Weight	appr. 108 kg

Standard Configuration

Main testing unit (host)

Test computer with professional software

Air dryer

Permeation cups (quantity matching model)

Calibration weights

Sample cutter

Optional Accessories

GMP Computerized System Module

Wax-sealed sample cups

Custom-sized permeation cups

User-Provided Items

Compressed air source (> 0.3 MPa)

Distilled water

Desiccant

Frequently Asked Questions (FAQ)

Q1: What is the difference between the Water Method and the Desiccant Method?

A: The ain) is used for moisture barriers (e.g., food packaging, pharmaceutical blisters), simulating a dry environment inside the package surrounded by ambient humidity. Using both provides a complete profile of material behavior.

Q2: Why is "Fog-Free Humidification" important?

A: Traditional ultrasonic humidifiers create microscopic water droplets that can settle on the test cup, artificially increasing its weight. This "false penetration" leads to inaccurate WVTR results. The W-B-121-G uses steam injection, which introduces pure water vapor, ensuring that only true vapor transmission is measured.

Q3: Can this instrument test finished packages like bottles or blister packs?

A: Yes. The instrument supports inverted cup testing. Finished containers can be mounted upside down (filled with desiccant or water) to measure the WVTR of the entire package structure, not just the material itself.

Q4: Does this instrument require a constant-temperature/humidity room?

A: No. The W-B-121-G features a fully integrated climate control system. It actively regulates the temperature and humidity within the test chamber, isolating the test from ambient lab conditions. This saves significant capital expenditure on facility upgrades.

Q5: How often does the desiccant need to be replaced?

A: The system includes an automatic desiccant regeneration cycle. Under normal operating conditions, the desiccant typically requires replacement only once per year, significantly reducing maintenance workload compared to manual cup testers.

Function
Water vapor permeability testing.
Water vapor transmission rate, permeability rate, permeability coefficient. Used for membranes, films, sheets, containers, and building materials made of materials such as plastic, fabric, leather, metal, etc.
Principle
Balance Weighing: Water method and desiccant method are integrated, upright or inverted test cup both supported. Desiccant (desiccant method) or water (water method) is placed in the cup; seal the cup with specimen, place it in the test chamber; control the temperature, humidity and airspeed of the test chamber; the humidity difference between cup’s inside and outside drives water vapor to permeate the sample; the mass of the sample cup increases or decreases; weighing the at a regular intervals, calculate the water vapor permeation and other performance parameters of the sample.
Standards
Pharmacopoeia - Method for Determination of Water Vapor Permeability, 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, etc.
Features
- Strict compliance with U.S. and international standards.
- Testing for 48 hours with a testing error less than 0.05 g/m²•24h, and the error attenuates to zero as the testing time increases.
- Fog-free humidifier: Completely gaseous, no fog, avoiding false permeation caused by fog settling.
- Built-in humidifier: Moisture directly enters the test chamber, bypassing the low-temperature zone to ensure stable high humidity.
- 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: Automatic humidity control, automatic water replenishment; semiconductor cooling and heating for bidirectional temperature control.
- Balance protection: Patented balance heat insulation and moisture-proof technology to ensure stability and longevity of the balance.
- Uniform airspeed: Double-plane spiral circulation air, uniform airspeed, humidity field, and temperature field.
- Fully automatic: One-key testing, automatic ending, and data saving; desiccant replacement of dryer is not required (once a year).
- Working environment: Indoor, constant temperature or humidity environment is not required(reducing operating costs), testing data can’t affected by environmental temperature and humidity.
- Self-diagnosis of faults: Self-check at startup to avoid testing in a faulty state.
- Data recording: Graphical, recording throughout the process with all elements, data not lost in case of power outage.
- Data security: Optional "GMP Computerized System" software module with user management, permission management, data audit trail, and other functions.

Specifications

Parameter	Value	Parameter	Value
Measurement Range	Film: 0.05-10,000 g/m2•24h Container: 0.0002-30 g/pkg•24h	Measurement Error	Film: 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	±03 ℃
Humidity Range	10% - 90%	Humidity Error	±2% RH
Airspeed	0.03 - 2.5 m/s（stepless speed regulation）	Air Pressure	>0.3 MPa (self-supplied)
Test Area	33 cm²（Other areas can be customized）	Sample Thickness	<3 mm
		Custom Cup Height	<150 mm
Power Supply	AC220V /110V ;50/60Hz	Power	＜2,000 W
Model	Model
	W-B-121-G
Sample Quantity	12
Mainframe Size	898(L)×727(B)×677(H)
Mainframe Net Weight	108 kg

Standard Configuration
Testing mainframe, computer, air dryer, professional testing software, sample cups, calibration weight, sampler.
Optional Configuration
GMP Computerized System software module, wax-sealed sample cups.
Self-supplied
Compressed air, distilled water, desiccant.

Keywords:

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