GB 18586-2026Indoor decorating and refurbishing materials - Limits of harmful substances in carpets, carpet underlays and polyvinyl chloride flooring (English PDF)

4.2 Requirements for the Limitation of Hazardous Substances in Polyvinyl Chloride Flooring

The limits for hazardous substances in PVC flooring shall comply with the provisions of Table 3.

5.1.1 Sampling, transportation, storage and preparation of samples

Newly manufactured or unused carpets and carpet underlays shall comply with the provisions of GB/T 35457.

5.1.2 Sample Pretreatment

The prepared samples were placed in the environmental test chamber for equilibration for (24±0.5) h. Before placing the samples in the environmental test chamber, samples were collected in the test chamber according to 5.1.3.

Blank gas is used for blank tests. The test conditions in the environmental test chamber are as follows.

a) Temperature. (23±1.0)°C;

b) Relative humidity. (50±3.0)%;

c) Air exchange rate. (1.0±0.05)/h;

d) Air velocity. 0.1 m/s ~ 0.3 m/s;

e) Background concentrations of TVOC <= 50 µg/m3, formaldehyde <= 6 µg/m3, and any VOC monomer <= 5 µg/m3;

f) Sample loading coefficient. (0.4±0.05) m²/m³;

g) The sample is placed horizontally at the bottom center of the environmental test chamber to ensure that the airflow is evenly distributed on the release surface of the sample.

To determine the release amount from the surface of carpet and carpet backing samples separately, the bottom of the carpet and carpet backing needs to be placed in a non-standardized environment.

On a movable stainless steel plate. Seal with non-releasable/non-absorbent aluminum foil (check before use) or a stainless steel frame. edge.

5.1.3 Gas Collection

Sampling of styrene, 4-phenylcyclohexene, butylated hydroxytoluene, and TVOC was performed according to ISO 16000-6, with a sampling flow rate of 100mL/min~200mL/min, collection volume is 3L~5L.

Formaldehyde sampling shall be performed in accordance with ISO 16000-3, with a sampling flow rate of 500 mL/min to 800 mL/min and a sampling volume of 12 L. 30L.

During non-standard atmospheric pressure environment testing, the gas sampling volume is corrected to the volume under standard atmospheric pressure (23°C, 101.3kPa).

5.1.4 Gas Analysis

The analysis of styrene, 4-phenylcyclohexene, butylated hydroxytoluene, and TVOC in gaseous samples was performed according to ISO 16000-6.Formaldehyde... The analysis was performed in accordance with ISO 16000-3.

5.1.5 Result Calculation

Based on the analytical results of the sample release test, the specific area release amount (SERa) of formaldehyde or VOCi is calculated according to formula (1).

5.1.6 Limit of Detection

The detection limit for any VOC monomer and formaldehyde mass concentration is 2 µg/m3.

5.2 Testing of Hazardous Substance Limits in Polyvinyl Chloride Flooring

5.2.1 Sampling

All test specimens used in the test should be cut at least 50 mm from the edge of the specimen.

5.2.2 Vinyl chloride monomer content

Proceed according to GB/T 4615.

5.2.3 Total Volatile Organic Compounds (TVOC) Emissions

5.2.3.1 Sample Preparation

Only the exposed surface of the sample is tested. The bottom and edges of the sample are sealed with aluminum foil-like sealing material or a sealing frame that releases no organic matter. For plate-shaped samples... The bottom can be arranged back-to-back. The area of the exposed surface of the sample is 1m², and it can be divided into two or more pieces depending on the actual situation of the sample.

5.2.3.2 Test conditions of the environmental test chamber

Test conditions in the environmental test chamber.

a) Effective volume. (1±1%) m³;

b) Temperature. (23.0±1.0)°C;

c) Relative humidity. (50.0±3.0)%;

d) Air exchange rate. (1.0±0.05)/h;

e) Sample loading coefficient. (1.0±0.05) m²/m³;

f) Test period. (72±1)h.

Other procedures shall be carried out in accordance with the provisions of Chapter 7 of GB/T 29899-2024.

5.2.3.3 Calculation and Representation of Results

The calculation is performed according to the area release rate specified in 8.3 of GB/T 29899-2024.

5.2.4 Heavy metal content

Heavy metals lead and cadmium shall be tested according to GB/T 39560.5; hexavalent chromium shall be tested according to GB/T 39560.702; mercury shall be tested according to... It shall be carried out in accordance with the provisions of GB/T 39560.4.

5.2.5 Total amount of phthalates

Proceed in accordance with GB/T 22048.

5.2.6 Determination of formaldehyde emission

5.2.6.1 Sample size

The sample dimensions are. length l = (500±5) mm; width b = (500±5) mm. If the sample size is insufficient, it can be prepared by splicing samples. […]

5.2.6.2 Sample equilibration treatment

The samples were placed at (23±1)°C and (50±5)% relative humidity for (7±1) days, with a minimum distance of 25 mm between samples, allowing air to circulate freely.

Free circulation was maintained on all sample surfaces. The air exchange rate in the constant temperature and humidity indoor environment was at least once per hour, and the formaldehyde concentration in the indoor air should not exceed 0.10 mg/m³.

5.2.6.3 Sealing the bottom and edges of the sample

Only the exposed surface of the sample is tested. The bottom and edges of the sample are sealed with formaldehyde-free aluminum foil or a sealing frame. For plate-shaped samples, the bottom sealing can be... They can be placed back-to-back.

5.2.6.4 Measurement

Except for sample size, sample balancing treatment and sealing requirements, all other requirements shall be in accordance with the provisions of 4.60 in GB/T 17657-2022.

5.2.7 Formamide content

Proceed according to GB/T 34842.

5.2.8 Polybrominated biphenyl content

Proceed according to GB/T 39560.6.

5.2.9 Content of polybrominated diphenyl ethers

Proceed according to GB/T 39560.6.