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GB/T 42996.2-2023: Guidelines for the control of key chemical substances in furniture - Part 2: Upholstered furniture
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Guidelines for the control of key chemical substances in furniture - Part 2: Upholstered furniture
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GB/T 42996.2-2023
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Basic data | Standard ID | GB/T 42996.2-2023 (GB/T42996.2-2023) | | Description (Translated English) | Guidelines for the control of key chemical substances in furniture - Part 2: Upholstered furniture | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y80 | | Classification of International Standard | 97.140 | | Word Count Estimation | 14,169 | | Date of Issue | 2023-09-07 | | Date of Implementation | 2024-04-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 42996.2-2023: Guidelines for the control of key chemical substances in furniture - Part 2: Upholstered furniture
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ICS 97.140
CCSY80
National Standards of People's Republic of China
Guidelines for the control of key chemical substances in furniture products
Part 2.Upholstered Furniture
Part 2.Upholsteredfurniture
2024-04-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Table of contents
PrefaceⅠ
Introduction II
1 Scope 1
2 Normative reference documents 1
3 Terms and Definitions 1
4 General 2
5 Management and control suggestions 2
6 Test method 2
Appendix A (normative) Measurement method for exposed area of upholstered furniture 6
Appendix B (informative) Test conditions and typical chromatograms for key chemical substances in upholstered furniture 8
Guidelines for the control of key chemical substances in furniture products
Part 2.Upholstered Furniture
1 Scope
This document provides the terms and definitions, general principles, control recommendations, and test methods involved in the control of key chemical substances in upholstered furniture products.
This document applies to the control of key chemical substances in upholstered furniture products.
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document.
GB/T 28202 Furniture Industry Terminology
GB/T 31106-2014 Determination of volatile organic compounds in furniture
GB/T 31107 General technical conditions for climate chambers for testing volatile organic compounds in furniture
ISO 16000-3.2011 Indoor air Part 3.Formaldehyde and other carbonyl compounds in indoor air and test room air
ISO 16000-6.2011 Indoor air Part 6.Active sampling with TenaxTA sorbent, thermal desorption and MS or MS-FID
Determination of volatile organic compounds in indoor and laboratory air by gas chromatography (Indoorair-Part 6.Determinationofvol-
ISO 16017-1.2000 Adsorbent tube/thermal desorption/capillary gas chromatography method for indoor, ambient and workplace air with volatile
phy-Part 1.Pumpedsampling)
3 Terms and definitions
The terms and definitions defined in GB/T 28202, GB/T 31107 and the following apply to this document.
3.1
Organic compounds released from the sample with a boiling point not exceeding 260°C.
[Source. GB/T 31106-2014, 3.1, with modifications]
3.2
Volatile organic compounds in furniture that have been proven or confirmed to be toxic to the human body and the environment and need to be strictly controlled.
The organic compounds are mixed evenly in the cabin, the air in the cabin is collected within the specified time, and the release concentration of volatile organic compounds is tested.
6.2 Instruments and equipment
6.2.1 Climate chamber. should comply with the requirements of GB/T 31107.
6.2.2 Constant flow gas sampler. The flow rate is stable and adjustable within 0mL/min~1000mL/min, and the accuracy is within ±5%.
6.2.3 Gas chromatograph. equipped with hydrogen flame detector (GC/FID) or mass selective detector (GC/MSD).
6.2.4 Thermal desorption device. should comply with the requirements of 5.3.10 and 5.3.11 in GB/T 31106-2014.
6.2.5 High performance liquid chromatography (HPLC). equipped with diode array or UV detector.
6.3 Storage of samples before testing
Upholstered furniture easily absorbs chemicals in the ambient air. The storage conditions before testing are one of the important factors affecting the results. In order to reduce environmental pollution,
To avoid interference caused by the environment, samples should be stored in the original sealed state in an indoor environment to avoid contact with chemical pollutants, and the storage environment should be controlled.
The concentration of key chemical substances in the environment is lower than the recommended value for control.
The storage temperature is 15℃~25℃, and the relative humidity is not higher than 65%.
Unpackaged samples are taken to avoid cross-contamination.
6.4 Test procedure
6.4.1 Loading factor and climate chamber selection
Try to choose a climate chamber with a load-bearing rate calculation result of 0.30m2/m3~0.70m2/m3, and try to be as close as possible to 0.50m2/m3.Small
Samples should be added to meet the load-carrying rate range by increasing the number of identical samples.
Products with evenly distributed materials should be tested as a whole or the samples should be prepared into specimens with a load-bearing rate of 0.50m2/m3, using 1m3 of air.
Waiting room test.
6.4.2 Sample preparation
6.4.2.1 Sample processing
Remove the packaging, protective film, hang tag and other packaging materials of the sample (if the product requires assembly, install the product according to the installation requirements specified by the product)
product), use a dry cotton cloth to clean the surface dust. Products with particularly large samples and evenly distributed materials should be prepared into specimens for testing according to 6.4.2.3.The results are as follows.
In case of dispute, the test results of the entire sample shall prevail. For products with uneven material distribution, the entire sample should be tested.
6.4.2.2 Measure the exposed area of the sample
Close the movable structure of the sample, unfold it for daily use, and measure and calculate the exposed area of the sample according to Appendix A.
6.4.2.3 Specimen preparation
If you need to prepare small sample specimens, you need to take proportional samples, including the main release sources of the sample. In order to ensure that the results of small test pieces and whole samples are consistent
Consistent, try to avoid edge areas as much as possible, select a position more than 100mm from the edge of the sample, and include all materials as much as possible, from fabric to elastic filling.
Sampling of the entire filling material. All incisions of the small test piece and the unexposed parts of the original product are sealed with aluminum tape that does not contain the key chemicals being tested.
Seal, or place the sample on a stainless steel plate and seal the sides with aluminum tape. When sealing the side, cover it to the surface (10±5)mm. Front and back materials
For different products with a main material ratio of 1.1, samples are taken from the front and back, and sealed back-to-back to prepare small test pieces.
6.4.3 Preprocessing
Samples should be placed in a pretreatment environment as soon as possible after preparation. When multiple samples are preprocessed at the same time, the distance between samples should be greater than 300mm as much as possible to ensure
Maintain air circulation to avoid sample cross-contamination.
The preprocessing process needs to meet the following conditions.
---Pretreatment environmental conditions. temperature is (23±2)℃, relative humidity is (50±10)%;
---Pretreatment time. (120±2)h.
6.4.4 Preparation of climate chamber
Clean the inner wall of the climate chamber with alkaline detergent, then clean it with distilled water and ventilate and dry it.
Open the climate chamber, adjust the temperature inside the chamber to (23±2.0)℃, the relative humidity to (50±5)%, the air exchange rate (1.0±0.05)h-1, and the air
After running for 24 hours, the air in the cabin was collected and the background concentration of the key chemical substances listed in Table 1 was tested.
6.4.5 Sample testing
After the sample pretreatment is completed, it is immediately transferred to the climate chamber for testing. Mattress samples should be placed on the stand, and other products should be in normal use.
Place it in the middle of the cabin. The bracket should be made of materials that are not easy to adsorb or release the key chemical substances in Table 1, and should occupy less space than the cabin.
1% of the volume to avoid affecting the air circulation in the cabin.
Close the hatch and record the time, start collecting the air in the cabin for measurement at (20±0.5) h, and calculate the key chemical values under the test conditions.
Substance test concentration. Before collecting the air in the cabin, it is recommended to extract the air in the cabin without the adsorption tube for at least 5 minutes to remove the leakage in the sampling pipe.
interference. The sampling flow rate should not exceed 80% of the air flow rate at the inlet of the environmental chamber.
During the test, the environmental indicators in the climate chamber should be kept constant.
---Temperature. (23±2.0)℃;
--- Relative humidity. (50±5)%;
---Air exchange rate. (1.0±0.05)h-1.
6.5 Collection and determination of key chemical substances
Formaldehyde, acetaldehyde and acrolein should be collected and measured according to the methods specified in ISO 16000-3.2011, and benzene, toluene and xylene should be collected and measured according to the methods specified in ISO 16000-3.2011.
Collect and measure according to the methods specified in GB/T 31106-2014 or ISO 16017-1.2000 and ISO 16000-6.2011, other key points
Chemical substances should be collected and measured in accordance with the provisions of ISO 16017-1.2000 and ISO 16000-6.2011.See Appendix B for test conditions.
6.6 Result calculation
6.6.1 Test concentrations of key chemical substances under test conditions
The test concentration of key chemical substances under test conditions is calculated according to formula (1).
Cv=Cvc-C0v (1)
In the formula.
Cv ---The mass concentration of key chemical substances under test conditions, in milligrams per cubic meter (mg/m3);
Cvc ---The test results of the mass concentration of key chemical substances in the climate chamber, in milligrams per cubic meter (mg/m3);
C0v ---The test results of the mass concentration of key chemical substances in the background of the climate chamber, in milligrams per cubic meter (mg/m3).
6.6.2 Release amounts of key chemical substances in samples
The release amount of key chemical substances in the sample is calculated according to formula (2).
C=
L0
L×Cv
(2)
In the formula.
C ---The release amount of key chemical substances in the sample, in milligrams per cubic meter (mg/m3);
L ---Loading rate of the sample, unit is square meter per cubic meter (m2/m3);
L0 --- standard load-bearing rate, the value is 0.5, the unit is square meters per cubic meter (m2/m3).
6.7 Result presentation
The release amount of key chemical substances in upholstered furniture is expressed in mg/m3, and the results are consistent with the number of digits of the control recommended values in Table 1.
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