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GB/T 18244-2022 PDF EnglishSearch result: GB/T 18244-2022_English: PDF (GB/T18244-2022)
GB/T18244-2022 (GBT18244-2022): PDF in EnglishGB/T 18244-2022 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 91.120.30 CCS Q 17 Replacing GB/T 18244-2000 Test Methods for Weathering Resistance of Building Waterproof Materials ISSUED ON. JULY 11, 2022 IMPLEMENTED ON. FEBRUARY 01, 2023 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of Contents Foreword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 5 4 General Provisions... 6 4.1 Laboratory maintenance conditions... 6 4.2 Preparation of specimen... 6 4.3 Calculation of retention rate and change rate results... 7 5 Hot Air Aging... 8 5.1 Overview... 8 5.2 Test device... 8 5.3 Test conditions... 8 5.4 Test procedures... 9 5.5 Test report... 9 6 Artificial Accelerated Weathering - Xenon Arc Lamp... 10 6.1 Overview... 10 6.2 Principle... 10 6.3 General... 11 6.4 Significance... 11 6.5 Application of laboratory light source accelerated weathering test... 12 6.6 Test device... 13 6.7 Exposure conditions... 13 6.8 Test procedures... 15 6.9 Test report... 16 7 Artificial Accelerates Weathering - Fluorescent UV Lamps... 17 7.1 Overview... 17 7.2 Principle... 17 7.3 General... 18 7.4 Significance... 18 7.5 Application of laboratory light source accelerated aging test... 18 7.6 Test device... 18 7.7 Exposure conditions... 19 7.8 Test procedures... 20 7.9 Test report... 21 Test Methods for Weathering Resistance of Building Waterproof Materials 1 Scope This Document specifies the test methods of general provisions, hot air aging, artificial accelerated weathering - xenon arc lamp and artificial accelerated weathering-fluorescent UV lamp for the aging test of building waterproofing materials. This Document is applicable to the determination of thermal aging and artificial accelerated weathering properties of building waterproofing sheets and building waterproofing coatings. 2 Normative References The provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 528 Rubber, Vulcanized or Thermoplastic - Determination of Tensile Stress-Strain Properties GB/T 11026.4 Electrical Insulating Materials - Thermal Endurance Properties - Part 4. Ageing Ovens - Single-Chamber Ovens GB/T 16422.1 Plastics - Methods of the Exposure to Laboratory Light Sources - Part 1. General Guidance GB/T 16422.2 Plastics - Methods of Exposure to Laboratory Light Sources - Part 2. Xenon-Arc Sources GB/T 16422.3 Plastics - Methods of Exposure to Laboratory Light Sources - Part 3. Fluorescent UV Lamps 3 Terms and Definitions For the purposes of this Document, the following terms and definitions apply. 3.1 Control < Weathering> A material that has a similar composition and structure to the test material, and whose properties are compared with the test material after exposure at the same time. NOTE. For example, when the formula to be evaluated is different from the currently used formula, a control is required. In this case, the material of the original formula is used as the control. [SOURCE. GB/T 16422.1-2019, 3.1, modification] 3.2 File specimen A portion of the test material that was stored under stable conditions and used to compare changes in properties before and after exposure. 3.3 Artificial accelerated weathering Expose the material to a laboratory weathering device, and perform periodic or enhanced environmental conditioning with reference to outdoor or actual use conditions. 4 General Provisions WARNING. Appropriate safety precautions shall be taken during the test to avoid damage caused by high temperature and ultraviolet radiation. 4.1 Laboratory maintenance conditions Laboratory maintenance conditions. the temperature is (23 ± 2) ℃, and the relative humidity is 40%~60%. File specimen for artificial accelerated weathering shall be stored in a dark room under laboratory curing conditions. The samples shall be placed under laboratory curing conditions for at least 24h before the test. 4.2 Preparation of specimen 4.2.1 Evaluation items for the aging performance of building waterproof materials. --- Non-destructive items. appearance, color difference, quality change, dimensional change, hardness, gloss, softening point, penetration, etc.; --- Destructive items. low temperature properties (low temperature flexibility, low temperature bending, cold brittle point), tensile properties, etc. 4.2.2 The number of groups of specimens for each test item. The specimens for parallel comparison test shall be no less than 3 groups. Among the 3 groups of specimens, one group is tested for the specified properties at the beginning of the test; one group is subjected to an aging test; the other group is stored in a dark room under laboratory test conditions, and a comparison When the temperature does not exceed 100°C, the allowable temperature deviation is ±1°C; when the temperature exceeds 100°C, the allowable temperature deviation is ±2°C. 5.3.2 Test period The test period shall be determined according to the material properties, and the time of the test period is generally determined by the obvious change in performance. The recommended time for test cycle include 7d, 10d, 14d, 28d, 56d, 90d, 112d, 224d. When the test period is no more than 28d, the allowable time deviation shall not exceed 4h; when the test period is more than 28d, the allowable time deviation shall not exceed 6h. 5.4 Test procedures 5.4.1 Installation of test piece Before the test, the test pieces need to be numbered, and the numbering method shall not affect the material performance test. The test piece can be mounted on the test frame by suitable metal clips or wires lined or covered with inert material. Determine whether to place horizontally or vertically according to product standards, and determine the orientation of the upper and lower surfaces when placed according to product characteristics. For products with non-permanent isolation material on the surface, it shall be determined whether non-permanent isolation material on the surface shall be removed for aging treatment according to the product characteristics; and the permanent isolation material shall not be removed. The total volume of the test piece shall not exceed 10% of the effective volume of the aging box, the distance between the test pieces shall be no less than 10mm; the distance between the test piece and the wall of the aging box shall be no less than 50mm; and the test piece shall not affect the gas flow and temperature uniformity of the box. 5.4.2 Exposure In order to reduce the influence of temperature inhomogeneity, the position of the test pieces can be exchanged periodically. During the whole test period, the temperature of the aging box shall be controlled within the specified temperature tolerance range. 5.4.3 Determination of performance after exposure After the test is completed, the test piece shall be placed under the conditions specified in the product standard for 24h; and then the relevant properties are measured. 5.5 Test report The test report shall include the following contents. a) this Document No.; b) the name, model, specification and preparation method of the test piece; c) the model of the test chamber and the form of the test frame; d) test period; e) Test conditions. the temperature and time adjusted for the test state, the test temperature and time, the temperature deviation range, the wind speed of the test chamber, the ventilation rate and the rotation speed of the rotating test frame; f) performance evaluation items and test methods; g) test results (comparison of test material and control); h) test personnel, date and location; i) any deviation from the stated conditions of this method. 6 Artificial Accelerated Weathering - Xenon Arc Lamp 6.1 Overview This Clause describes a test method for simulating climatic effects (temperature, humidity, and/or wetting) by exposing test pieces to a xenon arc lamp in a wet environment, which is used to simulate the natural aging effect by exposing materials to sunlight in an actual use environment. 6.2 Principle 6.2.1 A xenon arc lamp equipped with a filter is used to simulate the spectral distribution of the ultraviolet region and the visible light region in sunlight. 6.2.2 Under controlled environmental conditions, expose the test piece to different states of light, heat, wetting conditions and water (6.2.4). 6.2.3 Exposure conditions vary with the following options. a) filters; b) irradiance; c) temperature during light exposure; d) When the exposure conditions require humidity control, the relative humidity of the air in the test chamber during light and dark cycles; 6.4.3 While it may seem tempting to have a "universal acceleration factor" relating "x" hours or megajoules of radiation to actual exposure "y" months or years in artificially accelerated weathering or artificially accelerated radiation exposure tests, it does not apply to all material. There are several reasons why such acceleration factors are not applicable. a) The acceleration factor is dependent on the material, and shall have obvious differences with different materials or different formulations of the same material; b) Differences in degradation rates in actual use and in laboratory accelerated exposure tests can have a large impact on the calculation of the acceleration factor; c) The calculation of the acceleration factor is based on the irradiance ratio between the laboratory light source and sunlight (even when using the same frequency band), without taking into account the impact raising from differences in tem.......Source: https://www.ChineseStandard.net/PDF.aspx/GBT18244-2022 |