GB 24410-2009Indoor decorating and refurbishing materials -- Limit of harmful substances of water based woodenware coatings (English PDF)

5.1 Sampling

The product shall be sampled according to those specified in GB/T 3186.

5.2 Test methods

5.2.1 Volatile organic compounds content is tested according to those specified in

Appendix A of this standard. Test results of coating product are calculated according

to those specified in Article A.7.2 of Appendix A; those of putty product are calculated

according to those specified in Article A.7.1 of Appendix A.

5.2.3 Content of glycol ether and its esters (ethylene glycol monomethyl ether,

ethylene glycol monomethyl ether acetate, ethylene glycol ethyl ether, ethylene glycol

ethyl ether acetate and diethylene glycol butyl ether acetate) is tested according to

those specified in Appendix A of this standard

5.2.4 Content of free formaldehyde is tested according to those specified in

Appendix C of GB 18582-2008.

6.1 All the requirements listed in this standard are made for type inspection items.

6.1.1 Under the normal production, at least once type inspection shall be carried out

every year.

6.1.2 Under one of the following conditions, type inspection shall be carried out at

any time.

6.2 Judgment of inspection results

6.2.1 Inspection results are judged according to rounding value comparison method

specified in GB/T 1250.When the inspection results after rounding are 0, the results

shall be offered in one significant figure.

7.1 Mark on the product package shall not only meet those specified in GB/T 9750,

but also may be expressly indicated on the packaging mark according to the product

that passes through the inspection in this standard.

8.1 During the coating, good indoor ventilation shall be guaranteed.

8.3 After the coating is completed, the indoor ventilation continues to be maintained.

Appendix A

(Normative)

Test for Content of Volatile Organic Compound, Benzene

Series, Glycol Ether and Its Esters - Gas Chromatography

A.1 Scope

This appendix specifies test methods for the content of volatile organic compounds

(VOC), benzene series (benzene, toluene, ethylbenzene and dimethylbenzene),

glycol ether and its esters (ethylene glycol monomethyl ether, ethylene glycol

monomethyl ether acetate, ethylene glycol ethyl ether, ethylene glycol ethyl ether

acetate and diethylene glycol butyl ether acetate) in water based woodenware

coatings and water based putty.

A.2 Principle

After the sample is diluted, volatile organic compounds in the sample are separated

through the gas chromatographic analysis technology; after qualitative identification of

the measured compound, its content is tested by internal standard method.

A.3 Materials and reagents

A.3.1 Carrier gas. nitrogen, with purity greater than or equal to 99.995%.

A.3.2 Gas. hydrogen, with purity greater than or equal to 99.995%.

A.3.6 Calibration compounds

In this standard, calibration compounds cover benzene, toluene, ethylbenzene,

dimethylbenzene, ethylene glycol monomethyl ether, ethylene glycol monomethyl

ether acetate, ethylene glycol ethyl ether, ethylene glycol ethyl ether acetate,

A.3.7 Dilution solvent. organic solvent for diluting the sample; it doesn't contain any

substance interfering the test. The purity is at least 99% (mass fraction) or the purity is

known. For example, solvents such as acetonitrile, methanol or tetrahydrofuran.

A.3.8 Marker. compound that distinguishes VOC and non-VOC according to the

definition of VOC. In this standard, it is diethyl oxalate (251°C boiling point).

A.4 Instruments and equipment

A.4.1 Gas chromatograph; it is configured as follows.

A.4.1.1 Injection port of diverter; in addition, the lining of the vaporizing chamber is

replaceable;

A.4.1.2 Temperature programmed controller;

A.4.1.3 Detector

Any one of the following detectors may be used.

A.4.2 Sample injector. the capacity at least shall be twice the sample size;

A.4.3 Blending bottle. about 20mL glass bottle; it is provided with sealable bottle

cap;

A.4.4 Balance. 0.1mg accuracy.

A.5 Test conditions for gas chromatography

A.5.1 Chromatographic condition 1

Chromatographic column (basic column). 6% nitrile propyl benzene/94%

polydimethyl siloxane (PDMS) capillary column, 60m×0.32mm×1.0µm;

Temperature at injection port. 250°C;

Detector. FID; temperature. 260°C;

Column temperature. temperature programming; it is kept for 1 min at 80°C and then

increased to 230°C for 15min at 10°C/min;

Split ratio. split sampling; the split ratio is adjustable;

Sample size. 1.0µL.

......