Detail of GB 33372-2020

Introduction of GB 33372-2020

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. All technical contents of this standard are compulsory. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 33372-2016 Limit of volatile organic compound content in adhesives, with respect to which, the following main technical changes have been made: ——the scope of this standard is modified (see Clause 1; Clause 1 of Edition 2016); ——the terms and definitions are modified (see Clause 3; Clause 3 of Edition 2016); ——the classification of adhesives is added (see Clause 4); ——the limit of volatile organic compounds content in adhesive is modified and added according to different application fields (see Clause 5; Clause 4 of Edition 2016); ——the testing methods for VOC of different types of adhesives are modified and added according to different types of adhesives (see Clause 6 and annexes; Clause 5 and annexes of Edition 2016). This standard was proposed by and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China. The previous edition of this standard is as follows: ——GB/T 33372-2016. Limit of volatile organic compounds content in adhesive 1 Scope This standard specifies the limit requirements, test methods, inspection rules and marks for package of volatile organic compounds (hereinafter referred to as VOC) content in adhesive under specified conditions. This standard is applicable to the limit of volatile organic compounds content in solvent-based, water-based and bulk adhesives. This standard is not applicable to: ——the adhesives used as intermediates or not entering the circulation field to be used as raw materials for production; ——the adhesives for testing or evaluation in any research and development, quality assurance or analysis laboratory; ——urea formaldehyde, phenol formaldehyde and melamine formaldehyde adhesives; ——special functional surface treating agents for material bonding. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 2793 Test method for nonvolatile content of adhesives GB/T 2943 Terms of adhesive GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 13354 Test method for density of adhesives in fluid form - Method of weight cup GB 19340 Adhesives for footwear and case and bag GB/T 20740 Adhesive - Sampling GB 30982 Limit of hazardous substances in construction adhesive GB 37822 Standard for fugitive emission of volatile organic compounds HG/T 2492-2018 Ethyl-ɑ-cyanoacrylate instantaneous adhesives 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 2943 and GB 37822 as well as the following apply. 3.1 volatile organic compounds content VOC content mass of volatile organic compounds contained in adhesive per unit volume or mass measured under specified conditions 3.2 solvent-based adhesive adhesive with volatile organic solvents as main dispersion medium 3.3 water-based adhesive adhesive with water as main dispersion medium 3.4 bulk adhesive adhesive with dispersion medium content accounting for less than 5% of the total 4 Classification The adhesives may be classified into solvent-based type, water-based type and bulk type based on different dispersion medium and content in adhesive. Note: generally, water-based adhesive and bulk adhesive are low-VOC adhesives. 5 Limit of VOC content 5.1 Basic requirements 5.1.1 The content of single volatile organic compound in adhesive such as benzene series (benzene, methylbenzene and xylene), halogenated hydrocarbon (dichloromethane, 1,2-dichloroethane, 1,1,1-trichloroethane and 1,1,2-trichloroethane), toluene diisocyanate and free formaldehyde, shall meet the requirements of GB 30982 or GB 19340. 5.1.2 If the adhesive is expressly used for various purposes, the lowest limit in each requirement shall be taken. 5.2 Limit of VOC content in solvent-based adhesive The limit of VOC content in solvent-based adhesive shall meet those specified in Table 1. Table 1 Limit of VOC content in solvent-based adhesive Application field Limit/(g/L) ≤ Chloroprene rubber Styrene-butadiene-styrene segmented copolymer rubber Polyurethanes Acrylics Others Construction 650 550 500 510 500 Indoor decoration 600 500 400 510 450 Shoes and luggage 600 500 400 — 400 Carpenter and furniture 600 500 400 510 400 Assembly industry 600 550 250 510 250 Packaging 600 500 400 510 500 Special 850a — 550b — 700c Others 600 500 250 510 250 a For on-site emergency repair. b Dedicated for heavy-duty corrosion prevention. c Hot vulcanizing adhesive for shock absorption of automobile bridge. 5.3 Limit of VOC content in water-based adhesive The limit of VOC content in water-based adhesive shall meet those specified in Table 2.   Table 2 Limit of VOC content in water-based adhesive Application field Limit/(g/L) ≤ Polyvinyl acetates Polyvinyl alcohols Rubber Polyurethanes Vinyl acetate-ethylene copolymer emulsions Acrylics Others Construction 100 100 150 100 50 100 50 Indoor decoration 50 50 100 50 50 50 50 Shoes and luggage 50 — 150 50 50 100 50 Carpenter and furniture 100 — 100 50 50 50 50 Transportation 50 — 50 50 50 50 50 Assembly 100 — 100 50 50 50 50 Packaging 50 — 50 50 50 50 50 Others 50 50 50 50 50 50 50 5.4 Limit of VOC content in bulk adhesive See Table 3 for the limit of VOC content in bulk adhesive. Table 3 Limit of VOC content in bulk adhesive Application field Limit/(g/kg) ≤ Silicones MS Polyurethanes Polysulfides Acrylics Epoxy resins α-cyanoacrylic acids Thermoplastics Others Construction 100 100 50 50 — 100 20 50 50 Indoor decoration 100 50 50 50 — 50 20 50 50 Shoes and luggage — 50 50 — — — 20 50 50 Hygienic materials, garments and fiber processing — 50 50 — — — — 50 50 Paper conversion and book binding — 50 50 — — — — 50 50 Transportation 100 100 50 50 200 100 20 50 50 Assembly industry 100 100 50 50 200 100 20 50 50 Packaging 100 50 50 — — — — 50 50 Others 100 50 50 50 200 50 20 50 50 Note 1: MS refers to the adhesive with silane modified polymer as the main material. Note 2: thermoplastics refer to thermoplastic polyolefin or thermoplastic rubber. 6 Test methods 6.1 Sampling The sampling of adhesive shall be carried out according to GB/T 20740. 6.2 Determination of VOC content 6.2.1 The VOC content in solvent-based adhesive shall be determined according to Annex A. 6.2.2 The VOC content in water-based adhesive shall be determined according to Annex D. 6.2.3 The VOC content in bulk adhesive shall be determined according to Annex E. 6.2.4 The VOC content in ethyl-ɑ-cyanoacrylate instantaneous adhesive shall be determined according to the method specified in Annex B, HG/T 2492-2018. 6.2.5 VOC content may also be calculated according to the composition of the adhesive. If the calculation cannot be conducted or the calculation results fail to conform to the measurement results, the measurement results shall prevail. 7 Inspection rules 7.1 Inspection items 7.1.1 All requirements specified herein are applicable to type inspection items. 7.1.2 In normal production, type inspection shall be carried out at least once a year. 7.1.3 Type inspection shall be performed under any of the following cases: ——upon initial type approval of new product; ——upon off-site production of the product; ——where the production formula, process and critical raw material source are significantly changed; ——upon resumption of production after production halts for three months.

Contents of GB 33372-2020

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Classification 5 Limit of VOC content 6 Test methods 7 Inspection rules 8 Marks for package Annex A (Normative) Determination for VOC content in solvent-based adhesive Annex B (Normative) Determination for moisture content in adhesive Annex C (Normative) Determination for content of acetone, methyl acetate and dimethyl carbonate Annex D (Normative) Determination for VOC content in water-based adhesive Annex E (Normative) Determination for VOC content in bulk adhesive