Coating standards: three national standards for VOC of coatings

Core tip: there are three compulsory national standards for VOC of coatings: GB18581-2001, GB18582-2008 and gb24408-2009 GB18581-2001 limit of harmful substances in solvent based wood coatings is applicable to other types of wood coatings for interior decoration GB18582-2008 limit of harmful substances in interior wall coating of interior decoration materials is applicable to all kinds of water-based wall coating (including bottom) for interior decoration Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Home of coatings: there are three compulsory national standards for VOC of coatings: GB18581-2001, GB18582-2008 and gb24408-2009 GB18581-2001 limit of harmful substances in solvent based wood coatings is applicable to other types of wood coatings for interior decoration GB18582-2008 limit of harmful substances in interior wall coating of interior decoration materials is applicable to all kinds of water-based wall coating (including primer and finish) and water-based wall putty for interior decoration Compared with 2001 edition standard, the limited requirements for indoor water-based wall putty are increased Gb24408-2009 limit of harmful substances in exterior wall coatings for building is applicable to all kinds of water-based exterior wall coatings and solvent based exterior wall coatings which are directly applied on site and used for decoration and protection of exterior surfaces of buildings and structures with cement and other non-metallic materials as base materials The exterior wall coating for building covers a wide range This standard specifies the coating time, occasion and substrate to be coated for the applicable coating From the perspective of application scope of the standard, the standard is not applicable to the coatings that are pre coated for building materials, or the coatings that are used to decorate and protect the external surfaces of buildings and structures whose base materials are metal This standard is applicable to both water-based and solvent based exterior wall coatings 1 GB18581-2001 limit value of harmful substances in solvent based wood coatings: nitro paint polyurethane paint alkyd paint volatile organic compounds (VOC) a, (g / L) ≤ 750 gloss (60) ≥ 80600 550 gloss (60.) < 80600 benzene B,% ≤ 0.5 total toluene and xylene B,% ≤ 4540 10 free toluene diisocyanate (TDI) C,% ≤ 0.7 heavy metal (color Limited paint) mg / kg ≤ soluble lead 90 soluble cadmium 75 soluble chromium 60 soluble mercury 60 A determine after mixing according to the specified ratio and dilution ratio of the product If the amount of diluent used is in a certain range, it shall be measured after diluting according to the recommended maximum amount of diluent B if the product specifies the dilution ratio or the product is composed of two or more components, the content of diluent and each component shall be determined respectively, and then the total amount of the mixed coating shall be calculated according to the specified ratio of the product If the amount of diluent used is within a certain range, it shall be calculated according to the recommended maximum dilution amount C if the polyurethane paint specifies the dilution ratio or is composed of two or more components, the content of curing agent (including toluene diisocyanate prepolymer) shall be determined first, and then the content of the mixed paint shall be calculated according to the specified ratio of the product If the amount of diluent used is within a certain range, it shall be calculated according to the recommended minimum amount of worry 2 GB18582-2008 limit value of harmful substances in interior wall coating volatile organic compounds (VOC), (g / L) ＜ 200 free formaldehyde / (mg / kg) ＜ 100 heavy metal (mg / kg) soluble lead ≤ 90 soluble cadmium ≤ 75 soluble chromium ≤ 60 soluble mercury ≤ 60 3.gb24408-2009 limit value of harmful substances in exterior wall coating water based exterior wall coating solvent based exterior wall coating primer, finish, putty, paint, varnish, flash paint volatile organic compounds (VOC) content ＜ 120g / L 150g / L 15g / L 680g / L 700g / L 760g / L benzene B,% < 0.3 toluene, ethylbenzene and xylene C /% < 40 free formaldehyde content (mg / kg) < 100 free diisocyanate (TDI and HDI) d (limited to solvent based exterior wall coating with isocyanate as curing agent) /% < 0.4 Total amount of glycol ether and ether ester a, B, C (limited to glycol methyl ether, glycol methyl ether acetate, glycol ethyl ether, glycol ethyl ether acetate and diethylene glycol butyl ether acetate) /% ≤ 0.03 heavy metal content (limited to paint and putty) (mg / kg) ≤ lead (PB) 1000 cadmium (CD) 100 hexavalent chromium (Cr 6) + 1000 mercury (Hg) 1000 paint home is dedicated to paint, diatom mud, Paint and coating, coating technology, fire retardant coating news and coating, diatom mud, paint and coating, coating technology, decoration 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