GB 38468-2019 English PDF (GB38468-2019)

Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB 38468-2019
Historical versions: GB 38468-2019
Preview True-PDF (Reload/Scroll if blank)

GB 38468-2019: Limit of harmful substances of interior floor coatings
GB 38468-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 51
Limit of harmful substances of interior floor coatings
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Product classification ... 6 
5 Requirements ... 6 
6 Test methods ... 7 
7 Inspection rules ... 8 
8 Package marks ... 9 
Appendix A (Normative) Test of volatile organic compounds content, total
content of benzene, toluene, ethylbenzene and xylene, and total content of
glycol ethers and ether esters in water-based floor coatings - gas
chromatography ... 10 
Appendix B (Normative) Test of moisture content ... 18 
Appendix C (Normative) Test of volatile organic compounds (VOC) content in
solvent-based and solvent-free floor coatings ... 25 
Appendix D (Normative) Test of benzene content, toluene, ethylbenzene and
xylene content, as well as glycol ethers and ether esters content in solvent-
based and solvent-free floor coatings - gas chromatography analysis ... 27 
Limit of harmful substances of interior floor coatings
1 Scope
This Standard specifies the terms and definitions, product classification,
requirements, test methods, inspection rules and package marks etc. involved
in the allowable limits of substances harmful to humans and the environment in
interior floor coatings.
Note: Interior refers to the inside of places where the top is blocked or the top and the
surroundings are blocked, such as industrial plants, underground parking lots,
hospitals, schools, gymnasiums and other places. It is relative to places where the
top and the surroundings are not blocked.
This Standard applies to various interior floor coatings with organic polymers
as the main adhesives, which are painted on the base surface of floors such as
cement mortar, concrete, stone, plastic or steel, for decorating and protecting
the ground and other special functions (such as antistatic, corrosion resistance,
anti-skid, etc.); including primers, mid-coats, topcoats and finishes.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 1725-2007 Paints, varnishes and plastics - Determination of non-
volatile-matter content
GB/T 3186 Paints, varnishes and raw materials for paints and varnishes -
Sampling
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB/T 6750-2007 Paints and varnishes - Determination of density -
Pycnometer method
GB/T 8170-2008 Rules of rounding off for numerical values and expression
and judgement of limiting values
GB/T 9750 Marks for package of coating products
6.2 Test methods
6.2.1 The test of the volatile organic compounds content in water-based floor
coatings shall be carried out in accordance with the provisions of Appendix A
and Appendix B. The calculation of the test results shall be carried out in
accordance with A.7.1. The moisture content test in Appendix B may use gas
chromatography or Karl Fischer method. Gas chromatography is the arbitration
method.
6.2.2 The test of the total content of benzene, toluene, ethylbenzene and xylene
and the total content of glycol ethers and ether esters in water-based floor
coatings shall be carried out in accordance with Appendix A. The calculation of
the test results shall be carried out in accordance with A.7.2.
6.2.3 The test of the volatile organic compounds (VOC) content in solvent-
based and solvent-free floor coatings shall be carried out in accordance with
Appendix C.
6.2.4 The test of the benzene content, the total content of toluene, ethylbenzene
and xylene, and the total content of glycol ethers and ether esters in solvent-
based and solvent-free floor coatings shall be carried out in accordance with
Appendix D.
6.2.5 The test of formaldehyde in water-based floor coatings is carried out
according to the provisions of GB/T 23993-2009.
6.2.6 The total content of free diisocyanates (TDI and HDI) is tested in
accordance with GB/T 18446-2009.
6.2.7 For the sum of phthalates, prepare mixed samples according to the
construction proportion indicated by the product; then test according to the
provisions of Appendix C in GB 24613-2009; convert it to the content in the dry
coating film.
6.2.8 The content of soluble heavy metals (lead, cadmium, chromium, mercury)
is tested according to the provisions in GB/T 23991-2009. USE inductively
coupled plasma atomic emission spectrometer (ICP-OES) or other suitable
analytical instruments for testing.
7 Inspection rules
7.1 Type inspection items
7.1.1 All the requirements listed in this Standard are type inspection items.
Under normal production conditions, type inspection shall be carried out at least
Appendix A
(Normative)
Test of volatile organic compounds content, total content of benzene,
toluene, ethylbenzene and xylene, and total content of glycol ethers and
ether esters in water-based floor coatings - gas chromatography
A.1 Scope
This appendix specifies the test method for the volatile organic compounds
(VOC) content, the total content of benzene, toluene, ethylbenzene and xylene,
and the total content of glycol ethers and ether esters in water-based floor
coatings.
This method is suitable for the testing of coatings and their raw materials with
VOC content (mass fraction) greater than or equal to 0.1% and less than or
equal to 15%.
A.2 Principle
After the sample is diluted, the various volatile organic compounds in the
sample are separated by gas chromatography analysis. After the compound
under test is qualitatively identified, use the internal standard method to test its
content.
A.3 Materials and reagents
A.3.1 Carrier gas: nitrogen or helium; purity is ≥99.995%.
A.3.2 Fuel gas: hydrogen; purity is ≥99.995%.
A.3.3 Combustion-supporting gas: air.
A.3.4 Auxiliary gas (septum purge and makeup gas): nitrogen with the same
properties as the carrier gas.
A.3.5 Internal standard substance: a compound that does not exist in the
sample and can be completely separated from other components on the
chromatogram. The purity is at least 99% (mass fraction); or the purity is known.
For example, isobutanol, ethylene glycol monobutyl ether, ethylene glycol
dimethyl ether, diethylene glycol dimethyl ether, etc.
A.3.6 Calibration compounds: including methanol, ethanol, n-propanol,
A.4.3 Sample preparation bottle: about 20 mL glass bottle with a sealable cap.
A.4.4 Balance: Accuracy is 0.1 mg.
A.5 Test conditions of gas chromatography
A.5.1 Gas chromatographic condition 1:
- Chromatographic column (basic column): 6% cyanopropyl phenyl/94%
polydimethylsiloxane capillary column; 60 m×0.32 mm×1.0 μm;
- Injection port temperature: 250 °C;
- Detector: FID; temperature: 260 °C;
- Column temperature: temperature programming. KEEP at 80 °C for 1 min;
then increase to 230 °C at 10 °C/min and keep for 15 min;
- Split ratio: split injection. Split ratio is adjustable;
- Injection volume: 1.0 μL.
A.5.2 Gas chromatographic condi...