Evaluation method of environmental test chamber for free formaldehyde emission in decoration materials

Evaluation method of environmental test chamber for free formaldehyde emission in decoration materials

                --Dongguan Huanyi Instrument Technology Co., Ltd.

Product Name: Environmental Test Chamber for Formaldehyde Emission

Meet the standard: GB 50325-2020 Indoor Environmental Pollution Control Standard for Civil Construction Engineering

A. Evaluation method of formaldehyde emission environmental test chamber:

1. The volume of the environmental test chamber should be 0.05 m'~40m2.

2 The inner wall of the environmental test chamber should be constructed of inert materials such as stainless steel and glass.

3 The operating conditions of the environmental test chamber should meet the following requirements:

3.1 The temperature should be (23±0.5)C;

3.2 The relative humidity should be (50 ± 3)%;

3.3 The air exchange rate should be (1±0.05) times/h;

3.4 The air velocity near the surface of the tested sample should be 0.1m/s~0.3m/s;

3.5 The ratio of the surface area of the artificial wood board and its products, bonded wood structural materials, wall coverings, curtains, and soft pack samples to the volume of the environmental test chamber should be 1: 1, the ratio of the area of the carpet and carpet cushion samples to the volume of the environmental test chamber Should be 0.4: 1;

3.6 Before measuring the amount of formaldehyde and VOC emissions from material samples, the concentration of formaldehyde in the clean air in the environmental test chamber should not be greater than 0.006 mg/m, and the concentration of VOC should not be greater than 0.01 mg/m2.

B. Manufacturer: Dongguan Huanyi Instrument Technology Co., Ltd.

C. Environmental test chamber test requirements for formaldehyde emission:

1) The test should meet the following requirements:

1.1 The samples should be placed for no less than 1d under the conditions of (23±1)"C and relative humidity (50±5)% before the test. The distance between the samples should not be less than 25mm, and the air should be kept in

2) The test should meet the following requirements:

2.1 Before the test, the sample should be placed at (23±1)°C and relative humidity (50±5)% for no less than 1d, the distance between the sample pieces should not be less than 25mm, and the air should be placed on the surface of all the sample pieces. Free circulation, constant temperature and humidity indoor air changes should not be less than 1 time/h, the concentration of formaldehyde in the indoor air should not be greater than 0.05mg/m3, and the concentration of VOC should not be greater than 0.3mg/m3;

2.2 The artificial wood board and its products, bonded wood structure materials, wall coverings, and curtain samples should be placed vertically in the center of the environmental test chamber. The distance between the sample pieces should not be less than 200mm, and the surface should be parallel to the airflow direction;

2.3 Carpets and carpet cushion samples should be spread face up on the bottom of the environmental test cabin so that the air flow can pass through the surface of the sample evenly;

VOC environmental test chamber meeting GB50325-2020 standard

                 -Dongguan Huanyi Instrument Technology Co., Ltd.

Product name: VOC environmental test chamber, formaldehyde emission test chamber

Meet the standards: GB50325-2020 standard, GB/T18204.2 in the AHMT spectrophotometric method

A. VOC environmental test chamber test method introduction:

1 When using the environmental test chamber method to test the release of free formaldehyde from man-made wood boards and their products, and structural materials for adhesives, samples shall be taken twice a day from the second day of the test, with an interval of more than 3 hours. If it reaches a stable state, the sampling can be stopped: when When the deviation between the average value and the maximum or minimum of the last 4 measurements of formaldehyde concentration is less than 5% or less than 0.005mg/m', it is considered to have reached a stable state; if it has not reached a stable state, the 28d The test result of as the measured value;

2 Environmental test chamber method to test the release of free formaldehyde or voC of carpets, carpet liners, wall coverings and curtains. Under the test conditions, the samples should be placed continuously in the environmental test chamber for 24 hours.

3 During the gas sampling analysis in the environmental test chamber, the gas sampling system should be connected to the gas outlet of the environmental test chamber before sampling.

4 The sampling volume for determining the release of free formaldehyde in the material should be 5L~20L, the sampling flow rate should not be greater than the gas flow rate entering the cabin, and the test method should comply with the current national standard "Public Place Sanitary Inspection Method Part 2: Chemical Pollutants" According to the AHMT spectrophotometric method in GB/T18204.2, the background value of the environmental test chamber should be deducted at the same time. B.0.7 The sampling volume for the determination of the VOC release amount in the material should be 5L~10L, the sampling flow rate should not be greater than the gas flow rate into the cabin, the test method should meet the requirements of Appendix E of this standard, and the environmental test cabin should be deducted. Bottom value.

B. Dongguan Huanyi Instrument Technology Co., Ltd. professional manufacturer