前言
国际标准化组织 (国际标准化组织) 是国家标准机构的全球联盟 (ISO成员机构). 国际标准的制定通常通过ISO技术委员会进行. 每个对已成立技术委员会的主题感兴趣的成员机构都有权在该委员会中派代表参加. 与 ISO 联络的国际政府和非政府组织也参与了这项工作. ISO 与国际电工委员会密切合作 (国际电工委员会) 关于电工标准化的所有问题.

用于开发本文件的程序以及用于进一步维护的程序在第 1 部分中进行了描述。 1 ISO/IEC 指令的. 尤其, 注意不同类型的 ISO 文件所需的不同批准标准. This document has been drafted in accordance with the editing rules in Part 2 ISO/IEC 指令的 (请参阅 iso.org/directives).

请注意，本文档的某些内容可能受专利权保护. ISO 不负责识别任何或所有此类专利. Details of any patent rights identified during the preparation of the document will be in the introduction and/or list of patent claims received by ISO (参见 iso.org/patents).

Any trade names used in this document are information provided for the convenience of the user and do not constitute an endorsement.

自主性, 相关标准和合格评定相关的ISO特定术语和表达的含义以及ISO在技术性贸易壁垒中的含义 (技术性贸易壁垒) 坚持世界贸易组织原则 (世贸组织) 信息, please see the iso.org/iso/foreword.html.

This document has been prepared by Technical Committee ISO/TC 35, 油漆和清漆, 小组委员会SC 9, 油漆和清漆的常用测试方法.

The second edition rescinded and replaced the first edition (国际标准化组织 7783:2011), in which it constituted a minor revision to correct the conversion factor in formula (3) and to add a reference to ISO 4618 paint and varnish terms in Article 3.

Any feedback or questions about this document should be directed to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.

国际标准化组织 7783-2018 “油漆和清漆 — 水蒸气透过特性测定杯法”

介绍
This document is one of a series of standards dealing with the sampling and testing of paints, varnishes and related products. It describes a method for determining the water vapor transmittance of self-supporting and non-self-supporting coatings.

Water vapor transmittance is not necessarily a linear function of film thickness, 温度, or relative humidity difference. Measurements made under one set of conditions are not necessarily comparable to those made under other conditions. 所以, you must choose a test condition that is as close to the usage condition as possible.

Under conditions of high humidity, the propagation of water vapor is of greatest concern. 所以, the wet cup method has been adopted as the reference method. Depending on the agreement, other procedures and conditions may be used, such as the Cheers method.

国际标准化组织 7783-2018 “油漆和清漆 — 水蒸气透过特性测定杯法”

1 范围
This document specifies the method for determining the water vapour permeability of paints, varnishes and coatings for related products.

It complements ISO 12572. Procedures, definitions, and calculations have been taken over from ISO 12572 as far as possible. 如果需要的话, refer to ISO 12572 for a better understanding of the procedures specified in this document.

Vapor transmittance exceeding 680 g/ (m 2⋅d) (IE。, the vapor diffusion equivalent air layer thickness sd is less than 0.03 米) cannot be accurately quantified by the test method described in this document.

2 规范性引用文件
文中引用下列文件，其部分或全部内容构成本文件的要求. 对于注明日期的参考文献, 仅引用版本适用. 对于未注明日期的参考文献, the latest version of the reference (包括任何修订) 适用.

国际标准化组织 1513, 油漆和清漆 – 测试样品的检查和制备

国际标准化组织 2808, 油漆和清漆 – 薄膜厚度的测定

国际标准化组织 3233-1, 油漆和清漆 – Determination of non-volatile substances as a percentage by volume – 部分 1: Method for determination of non-volatile substances using a coating test panel and dry film density by Archimedean principle

国际标准化组织 3696, Analytical laboratory water – 规格及测试方法

国际标准化组织 4618, 油漆和清漆 — 术语和定义

国际标准化组织 15528, 油漆, 清漆以及油漆和清漆的原材料 — 采样

3 术语和定义
就本文件而言, ISO 中给出的术语和定义 4618 并且以下文章适用.

3.1 Water vapor transmittance

The mass of water vapor transmitted over a given surface area of the sample under a specified constant relative humidity on each surface of the sample under test over a given period of time

笔记 1: It is measured in grams/square meters per day [g/ (m2⋅d)].

笔记 2 Water vapor transmittance p measured at atmospheric pressure can be converted to the equivalent value at standard atmospheric pressure p0 by multiplying p/p0. This allows for a linear correlation of 20,4, with the water vapor diffusion equivalent air layer thickness (sd) 价值 (看 3.3).

笔记 3: 期限 “water vapor transfer” is often incorrectly used for water vapor transfer rates.

3.2 Velocity G of steam flowing through the sample under test

The mass of constant water vapor passing through each surface of the sample under test at a specified constant relative humidity during a given period of time

笔记 1: It is expressed in grams per hour.

3.3 Vapor diffusion equivalent air layer thickness SD

The thickness of a static air layer with the same water vapor transmittance as the test coating under the same measurement conditions

笔记 1: It is measured in meters.

3.4 Water vapor drag coefficient M

A coefficient indicating how many times more resistant a material is to water vapor than a static air layer of the same thickness at the same temperature and pressure

笔记 1: It is dimensionless.

笔记 2 The calculation and use of the water vapor drag coefficient is meaningful only if the water vapor transmittance of a particular material is constant, 那是, independent of thickness, 哪个, 然而, is not usually the case for coatings.

国际标准化组织 7783-2018 “油漆和清漆 — 水蒸气透过特性测定杯法”

3.5 标本

&其; Non-self-supporting coating > Coated supporting material

3.6 标本

&其; Self-supporting coating > Separate coating

3.7 Wet Cup Method

Method for measuring water vapor permeability in which the sample is sealed around the rim of a cup containing a saturated aqueous solution of ammonium dihydrogen phosphate

笔记 1: This is the most convenient method for determining water vapor permeability at high relative humidity (之间 93% 和 50%).

3.8 Cheers

A method of measuring the permeability of water vapor in which a sample is sealed around the edge of a cup containing a desiccant

笔记 1: This is the most convenient method for determining water vapor permeability at low relative humidity (之间 50% 和 3%).

3.9 Testing Components

An assembly consisting of a test cup sealed at the edge of a test cup containing a saturated ammonium dihydrogen phosphate solution in contact with an undissolved ammonium dihydrogen phosphate crystal (wet cup method) or containing a desiccant (cheers method)

3.10 测试区

The surface area of the sample under test through which water vapor flows during the test

笔记 1: It is measured in square metres.

仅标准信息部分是公开的. 查看完整内容, 需要通过官方渠道购买标准.