GB/T 45365-2025 PDF EnglishUS$215.00 · In stock · Download in 9 seconds
GB/T 45365-2025: Textiles - Determination of moisturizing effect - Measurement of microclimate using sweating guarded hotplate Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 45365-2025: Textiles - Determination of moisturizing effect - Measurement of microclimate using sweating guarded hotplate---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT45365-2025 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 59.080.30 CCS W 04 Textiles - Determination of Moisturizing Effect - Measurement of Microclimate Using Sweating Guarded Hotplate (ISO 21232.2018, Textiles - Determination of Moisturizing Effect of Textile Materials by Measurement of Microclimate between Textiles and Simulated Human Skin Using Sweating Guarded Hotplate, MOD) Issued on: FEBRUARY 28, 2025 Implemented on: SEPTEMBER 1, 2025 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative References... 5 3 Terms and Definitions... 5 4 Principle... 6 5 Equipment... 7 6 Test Steps... 9 7 Test Report... 10 Appendix A (normative) Evaluation of Hydration Value... 11 Appendix B (informative) Example of Test Results... 12ForewordThis document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives for Standardization - Part 1.Rules for the Structure and Drafting of Standardizing Documents. This document modifies and adopts ISO 21232.2018 Textiles - Determination of Moisturizing Effect of Textile Materials by Measurement of Microclimate between Textiles and Simulated Human Skin Using Sweating Guarded Hotplate. In comparison with ISO 21232.2018, this document makes the following structural adjustments. ---6.2.2 corresponds to 6.3.2 of ISO 21232.2018; ---6.2.4 corresponds to 6.2.2 of ISO 21232.2018; ---6.3.2 corresponds to 6.3.3 of ISO 21232.2018; ---6.2.3 and 6.3.3 are added. The technical differences between this document and ISO 21232.2018 and the causes for these differences are as follows. ---The requirement that “the size of the frame shall be consistent with the size of the sweating guarded hotplate” is added (see 5.3), and meanwhile, the annotation of the frame side length in Figure 3 is deleted (see Figure 3 of ISO 21232.2018) to ensure that the frame size matches the sweating guarded hotplate; ---The normative reference GB/T 6529 is used to replace ISO 139 (see 6.1.2) to adapt to the technical conditions of China; ---The normative reference GB/T 11048-2018 is used to replace ISO 11092.2014 (see 5.1, 5.5, 6.2.3, 6.3.1, and A.3 of Appendix A) to adapt to the technical conditions of China; ---The allowable deviations of temperature, relative humidity and wind speed are added (see 6.2.2) to improve the operability of the test; ---The determination of instrument constants is added (see 6.2.3) to improve the operability of the test; ---The specimen installation requirements are added (see 6.2.4) to improve the accuracy of the test; ---The provisions on result calculation and value are added (see 6.3.3) to unify the result calculation and value requirements; ---The number of determinations of hydration value is modified (see A.3; A.3 in Appendix A of ISO 21232.2018) to improve the stability of the results. Textiles - Determination of Moisturizing Effect - Measurement of Microclimate Using Sweating Guarded Hotplate1 ScopeThis document describes a test method for determining the moisturizing effect of textile materials by measuring the water-vapor resistance including air layer and relative humidity by means of a sweating guarded hotplate under simulated microclimate conditions. This document is applicable to all types of clothing fabrics. Films, leather and multi-layer composite materials may take this as a reference.2 Normative ReferencesThe contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 6529 Textiles - Standard Atmospheres for Conditioning and Testing (GB/T 6529-2008, ISO 139.2005, MOD) GB/T 11048-2018 Textiles - Physiological Effects - Measurement of Thermal and Water-vapor Resistance under Steady-state Conditions (sweating guarded-hotplate test) (ISO 11092.2014, MOD)3 Terms and DefinitionsThe following terms and definitions are applicable to this document. 3.1 water-vapor resistance Ret The ratio of the water vapor pressure difference on both sides of a specimen to the evaporation heat flow per unit area passing vertically through the specimen. NOTE 1.the evaporation heat flow may be formed by diffusion and convection. NOTE 2.the unit of water-vapor resistance Ret is (m2 Pa/W). [source. GB/T 11048-2018, 2.2] 3.2 microclimate The environmental climate in a small air layer (between the skin and the fabric or between the textile and the sweating guarded hotplate). NOTE. this microclimate has certain temperature and humidity characteristics. 3.3 water-vapor resistance including air layer Ret_al The ratio of the water vapor pressure difference on both sides of a specimen (including a 5 mm thick air layer) to the evaporation heat flow per unit area passing vertically through the specimen. NOTE 1.the water-vapor resistance including air layer is determined under the simulated state that there is an air layer between the skin and the clothes. NOTE 2.the unit of water-vapor resistance including air layer Ret_al is (m2 Pa/W). 3.4 hydration value The difference in dielectric constant between water and other substances obtained by measuring the capacitance of the dielectric. NOTE 1.a dielectric constant tester or skin moisture tester measures the change in dielectric constant, which is caused by the change in capacitance due to the hydration of the skin surface. NOTE 2.the dielectric constant of water is 81. NOTE 3.hydration values are expressed as numbers from 0 ~ 130.4 PrincipleIn order to simulate the microclimate, a device is designed to separate the specimen from the hotplate, which contains a humidity sensor. The hotplate is covered with a breathable and water- impermeable film to simulate the hydration of the skin. The moisturizing effect of the textiles is determined by measuring the water-vapor resistance including air layer (Ret_al) and the relative humidity between the sweating guarded hotplate and the specimen. NOTE. the wearing comfort of clothing usually depends on the microclimate environmental conditions (humidity and temperature) between the skin and the fabric. The test method in this document simulates the moisturizing mechanism of textiles when they act as a barrier to prevent moisture evaporation, and the ability of textiles to maintain moisture equilibriumAppendix A(normative) Evaluation of Hydration Value A.1 Measurement Principle The electrical properties of the skin surface depend on the moisture content of the epidermal stratum corneum. The dielectric constant of the epidermal stratum corneum is obtained by measuring the capacitance with a dielectric constant tester or a skin moisture tester. The difference between the dielectric constant of water (81) and the dielectric constant of the epidermal stratum corneum is used to evaluate the hydration of the epidermis. After the skin surface is hydrated, the attenuation change of the capacitance will lead to the change of the dielectric constant. A.2 Dielectric Constant Tester The dielectric constant tester or skin moisture tester has two electrodes (positive and negative). The electromagnetic field formed by these two electrodes can determine the dielectric properties of the stratum corneum. A.3 Measurement of Hydration Value The surface of the porous plate is kept moist by a water supply device (see Figure 1). In accordance with the test conditions and procedures specified in 7.4 of GB/T 11048-2018, a breathable and water-impermeable film shall be covered on the porous plate. After the temperature of the test plate, air temperature, humidity and heating power reach a stable state, measure the hydration value. Place the probe on the film surface to measure for 1 second. Measure at least 10 times in different areas and take the average value. After each measurement, clean the probe. The measured capacitance change depends on the moisture content of the sample. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 45365-2025 be delivered?Answer: The full copy PDF of English version of GB/T 45365-2025 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 45365-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 45365-2025_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 45365-2025 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.How to buy and download a true PDF of English version of GB/T 45365-2025?A step-by-step guide to download PDF of GB/T 45365-2025_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 45365-2025". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
