JIS Z-0208 Test Methods for Determining the Water Vapor Transmission Rate of Moisture-Resistant Packaging Materials (Plate Method)

EUROLAB laboratory provides testing and compliance services within the scope of JIS Z-0208 standard. This Japanese Industry Standard JIS Z-0208 specifies the method by which a water vapor transmission dish is used to test the water vapor transmission rate of moisture resistant packaging materials such as plastic film, covered paper and the like.

Water vapor transmission rate (MVTR) is a measure of the passage of water vapor through a material (usually a vapor barrier in the form of a film or fabric) in a given unit area per unit time under specified conditions. temperature and humidity conditions. It is also called the water vapor transmission rate (WVTR).

In metric units, MVTR/WVTR is typically expressed in grams per square meter per 24 hours (g/m²/day). In the US, it is expressed in grams per 24 square inches per 100 hours (g/100 inches²/day). A low WRTR indicates that the material has a higher capacity to keep moist products moist and dry products dry. Remember that vapor permeability is related to gaseous water.

Materials with controlled low MVTR are used in the packaging of moisture sensitive foods and medicines. This ensures high quality, safety and long shelf life. Food packaging often uses a combination of coating and packaging to control moisture. On the other hand, high MVTR in garments is important to achieve greater comfort and high breathability for garment wearers.

This test method determines the water vapor barrier properties of the package. With appropriate precautions and past experience, reproducible results can be achieved to assist in the selection of appropriate packaging materials required to achieve the desired product shelf life. This test method can be used to establish a performance specification.

This method is generally not recommended if the delivery rate is expected to be less than 1 g/m2 per day or for materials thicker than 3 mm. In such cases, the method specified in ISO 9932 is preferred.

The method is not applicable to film materials that have been damaged by hot wax or have shrunk significantly under the test conditions used. For some purposes it may be necessary to determine the transmission rate of crumpled material.

This document describes a method that can theoretically be applied to any sheet material. In practice, its main use is for flat, usually thin materials that can be processed to form a water vapor resistant barrier, such as paper, cardboard, plastic films or paper laminates with film or metal foil, and for fabrics coated with rubber or plastic.

The water vapor pressure difference is an essential part of this test and in this case it was not possible to adopt the conditions recommended in ISO 554. Also, the limits of temperature and humidity control are stricter than those required for normal testing.

The purpose of this test is to give reliable water vapor transmission rate (WVTR) values ​​through simple apparatus. However, the use of the results of any particular application should be based on experience.

Our organization, EUROLAB, also provides testing services for JIS Z-0208 Test Methods for Determining the Water Vapor Transmission Rate of Moisture-Resistant Packaging Materials (Plate Method) to enterprises within the framework of laboratory services of materials. Do not hesitate to contact our laboratory EUROLAB for your testing and certification requests.