ASTM D1653-13(2021) PDF
Standard Test Methods for Water Vapor Transmission of Organic Coating Films
Standard Test Methods for Water Vapor Transmission of Organic Coating Films
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 5
- Дата публикации:
- 1 июня 2021 г.
- Издание:
- D1653
- ICS:
- 25.220.60
SIGNIFICANCE AND USE 5.1 One of the factors affecting the performance provided by an organic coating is its capability of resisting or aiding the passage of water vapor. In some services, for example, exterior wood and masonry, the coating has to allow moderate amounts of water vapor to pass through the film without damage to it. Hence, the water vapor transmission characteristics of coatings are important in assessing their performance in practical use. 5.2 The purpose of these test methods is to obtain values of water vapor transfer through coatings that range in permeability from high to low. These values are for use in design, manufacture, and marketing. 5.3 The water vapor transmission is not a linear function of film thickness, temperature or relative humidity. 5.4 Values of water vapor transmission rate (WVT) and water vapor permeance (WVP) can be used in the relative rating of coatings only if the coatings are tested under the same closely controlled conditions of temperature and relative humidity, and if their thicknesses are equal. 5.5 Test Method A—The Dry Cup Method is the preferred test method for obtaining values that relate to conventional dwellings where high relative humidities are not anticipated. 5.6 Test Method B—The Wet Cup Method is the preferred test method for obtaining values that relate to applications where high relative humidities are anticipated in the vicinity of the barrier material. In general, the more permeable a coating is to the passage of moisture as is typical of many water-reducible coatings, the greater its affinity for water and the greater the increase in transmission when tested in and exposed to high humidities. Absorption of water may make a coating less dense, thus allowing moisture to diffuse easily and cause a much higher moisture vapor transmission rate, (WVTR) than would occur in drier environments. SCOPE 1.1 These test methods cover the determination of the rate at which water vapor passes through films of paint, varnish, lacquer, and other organic coatings. The films may be free films or they may be applied to porous substrates. 1.2 A similar, but more generally applicable test method is Test Methods E96 which should be considered when other materials are involved. 1.3 Two test methods are covered in Test Methods D1653 as follows: 1.3.1 Test Method A—Dry Cup Method, and 1.3.2 Test Method B—Wet (Payne) Cup Method. 1.3.3 Agreement should not be expected between results obtained by different methods or test conditions. The method that most closely approaches the conditions of use should be selected. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. Factors for conversion are stated in 13.2.1.2 and 13.2.2.2. 1.5 There are instruments on the market that purport to measure water vapor transmission of films more easily and rapidly than the methods described in Test Methods D1653 and E96. They run essentially the same kinds of tests as in the ASTM methods, but do so instrumentally. However, it appears that no side-by-side tests have been run comparing results from measurements with such instruments to these ASTM methods for precision and accuracy. 1.6 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM D1653-13(2021): Standard Test Methods for Water Vapor Transmission of Organic Coating Films provides well-established procedures for determining the rate at which water vapor passes through films of paint, varnish, lacquer, and other organic coatings. These methods are instrumental in evaluating the water vapor transmission characteristics - also known as water vapor permeance - of coatings applied as free films or to porous substrates. This standard is widely used across industries to assess and compare the protective capabilities and durability of coatings under varying humidity conditions.
Water vapor transmission is a key property impacting the performance of organic coatings, especially for applications like exterior wood and masonry where managing moisture flow through the coating layer is essential to avoid degradation. By following the standardized procedures outlined in ASTM D1653, manufacturers, designers, and regulators can consistently evaluate and compare products for use in environments with differing moisture profiles.
Key Topics
- Water Vapor Transmission Rate (WVT): Measures the steady rate of water vapor flow through a coating film, crucial for determining coating performance under specific environmental conditions.
- Water Vapor Permeance (WVP): Describes the ability of the coating to transmit moisture when subjected to a unit vapor pressure difference.
- Test Method A – Dry Cup Method: Preferred for typical indoor or moderate humidity applications. Uses desiccant in the test cup to create a low-humidity environment.
- Test Method B – Wet Cup Method: Suited for high-humidity environments. Uses water in the test cup to maintain a moist source beneath the film.
- Controlled Conditions: Accurate comparisons require identical film thicknesses, temperatures, and relative humidities. Water vapor transmission is not a linear function of thickness, temperature, or humidity.
Applications
ASTM D1653 test methods are essential for product development, quality assurance, and material selection in various industries, including:
- Architectural and Protective Coatings: Evaluating paint and coating formulations for buildings, bridges, and infrastructure where moisture management is critical.
- Flooring and Wall Systems: Assessing performance of coatings applied to masonry, wood, or composite materials in environments exposed to variable humidity.
- Research and Development: Comparing new or modified coating systems under standardized and controlled laboratory conditions.
- Building Design and Maintenance: Informing selection of coatings based on required moisture permeability to balance protection against water ingress with allowing necessary vapor diffusion.
- Marketing Claims and Product Declarations: Supporting transparent and comparable product data for end users and regulators.
Related Standards
- ASTM E96: Test Methods for Water Vapor Transmission of Materials - a broader method encompassing various types of materials, not only organic coatings.
- ASTM D823: Practices for Producing Films of Uniform Thickness of Paint, Coatings, and Related Products on Test Panels.
- ASTM D1005: Test Method for Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers.
- ASTM D1193: Specification for Reagent Water - referenced for preparation of test materials.
- ASTM D4708: Practice for Preparation of Uniform Free Films of Organic Coatings.
- ASTM E104: Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions.
Practical Value
Using ASTM D1653 ensures reliable, reproducible data for the water vapor transmission of organic coating films, enabling manufacturers and designers to optimize coating selection and formulation for specific environmental exposures. This standard provides a scientific basis for comparing products and supports the design of building envelopes and protective systems that balance weather protection with the need for moisture control. Proper application of these methods aids in extending the life and performance of coated substrates in diverse conditions.
Keywords: water vapor transmission, water vapor permeance, organic coatings, ASTM D1653, protective coatings, water vapor barrier, paint permeability, moisture management, test methods, coating durability.
Технические детали
- Технический комитет
- D01 - Paint and Related Coatings, Materials, and Applications
- SKU
- ASTM D1653-13(2021)
Похожие стандарты
Другие стандарты ASTM
ASTM-TPT-47
Phase I & Phase II Environmental Site Assessment Processes
Phase I & Phase II Environmental Site Assessment Processes
ASTM-TPT-8
Phase I Environmental Site Assessment Practices For Commercial Real Estate: Phase I Site Assessment & Transac…
ASTM-TPT-1137
ASTM D975 Standard Specification for Diesel Fuel
ASTM D975 Standard Specification for Diesel Fuel
ASTM-TPT-1202
ASTM D8421 Standard Test Method for Determination of Per- and Polyfluoroalkyl Substances (PFAS) in Aqueous Ma…
ASTM D8421 Standard Test Method -- eLearning Course
ASTM-TPT-691
Microaprendizagem para D4057: Amostragem de ponto (PT)
D4057 Microlearning: Spot Sampling Portuguese
ASTM-TPT-1091
Metodo de prueba estandar D4052 de ASTM -- Curso de aprendizaje electrónico (ES)
Modulo eLearning para ASTM D4052 en espanol
ASTM ACEM20180086
Using Neutron Radiography to Quantify the Settlement of Fresh Concrete
Specifications have been implemented for concrete bridge decks in North America that restrict the use of higher slump concrete mixtures primarily because of concerns about differential settlement and…
ASTM ACEM20180041
Experimental Study of Competing Failure of Reinforced Concrete Based on the Weibull Distribution
To predict the failure lifetime of reinforced concrete, a current accelerating corrosion test was performed on concrete by simulating the environment in an area with saline soil. To study the concret…