Water vapor transmission rate (WVTR) testing determines how well a material holds moisture, also called the barrier effect. WVTR is an important parameter in the product development of materials that must withstand different moisture levels at varying temperatures, such as food packaging, construction materials, cosmetics, and medical equipment.
What is the water vapor transmission rate?
Water vapor transmission rate (WVTR) represents the amount of water vapor that passes through a material or substance over a set period of time. Data received through a WVTR analysis is often presented in g/m2 per day (how much water in weight passes through a one square meter area in 24 hours).
What is WVTR testing used for?
The water vapor transmission rate is an important variable in materials that are used in wet environments. In food contact materials, an effective moisture barrier is critical to keep the product fresh and prevent it from gathering mold and mildew. Another important variable in food packaging testing is the oxygen transmission rate, which measures the material's barrier effect against oxygen.
A moisture barrier is crucial in the opposite case as well: when packing liquids, it is important to ensure the product will not leak through the material and thus get exposed to outer threats. In addition to food, this also applies to products like cosmetics and their packaging solutions.
In construction material applications, WVTR and moisture barriers are essential factors in wet rooms and outdoor solutions. For the same reason as in food packaging, keeping moisture out is vital for maintaining the quality of buildings and building materials.
Caratteristiche:
1. touch screen control, Chinese and English menu, man-machine dialogue mode, convenient operation.
2. rotating sample placement frame, 1 ~ 15r/min speed adjustable, the test results than the fixed sample frame uniform.
3. high precision temperature and humidity sensor, control using PID algorithm fluctuation is small, effectively prevent temperature and humidity overshoot.
4. including temperature and humidity calibration function, can be very good to avoid the sensor deviation caused by long-term use.
5. MCU control, color touch screen operation, modular design, temperature and humidity digital setting, intelligent control, real-time display of temperature and humidity and timing time.
6. Input parameters on the touch screen to calculate WVT g/(h.m?), WVP g/(h.MHg.m ?), PV g.cm/(h.MHg.m ?) value.
7. the instrument is equipped with PC software, temperature and humidity curve can be recorded, convenient for a large number of data report calculation and printing, suitable for a variety of standards and measurement methods.
standard：
ISO 15106-2 - Plastics -- Film and sheeting -- Determination of water vapour transmission rate -- Part 2: Infrared detection sensor method
ASTM F1249 - Standard Test Method for Water Vapor Transmission Rate Through Plastic Film and Sheeting Using a Modulated Infrared Sensor
TAPPI T557 - Water vapor transmission rate through plastic films and sheeting using a modulated infrared sensor
ISO 2528 - Sheet materials -- Determination of water vapour transmission rate -- Gravimetric (dish) method
ASTM E96 - Standard Test Methods for Water Vapor Transmission of Materials
ASTM D1653 - Standard Test Methods for Water Vapor Transmission of Organic Coating Films
TAPPI T464 - Water Vapor Transmission Rate of Paper and Paperboard at High Temperature and Humidity
ISO 15106-3 - Plastics -- Film and sheeting -- Determination of water vapour transmission rate -- Part 3: Electrolytic detection sensor method.
Parametri principali:
Adjustable temperature control Accuracy：18 ~ 50℃±0.5℃
Temperature resolution：±0.1℃
Adjustable relative humidity：40 ~ 95%RH; ±2%RH
Air flow：0.1 ~ 0.8m/s
Speed：1 ~ 15r/min
The number of cups：8 ASTM standard for single layer
Machine size：750×720×1400mm
Weight:110kg
Power source:AC220V 50Hz 3500W
How is the water vapor transmission rate measured?
Different materials require different measurement techniques to get the most accurate WVTR results. Materials with weak barriers (that let through a lot of moisture) can be measured with a gravimetric technique, while materials with good barriers (that don't let through a lot of moisture) should be analyzed with humidity sensors or infrared sensors.
It is also important to make the testing conditions similar to the environment where the material will be used. This includes tuning the measurement temperature and carrier gas to simulate the intended real-world conditions. ' experts always ensure that the measurements are done in the correct conditions so that your test results correspond to the real usage environment of your materials.
Need a WVTR analysis?
Qinsun offers high-quality WVTR, OTR, and other barrier testing services. If required, our skilled experts will also assist in choosing the appropriate testing conditions to ensure the analysis gives you useful insights. Contact us through the form below to request a quote for your specific need and number of samples – we offer competitive pricing, especially for large sample batches and frequent orders.
Disclaimer: Il contenuto di cui sopra è per riferimento e comunicazione solo tra addetti ai lavori del settore e non garantisce la sua accuratezza o completezza. Secondo le leggi e i regolamenti pertinenti e i regolamenti di questo sito web, le unità o le persone fisiche che acquistano articoli correlati devono ottenere qualifiche e condizioni di qualificazione valide.
