China National Standards

China Determination the poly GB Standards List


  •  China "Determination the poly" GB Standards List:
  • Standard  Code Standard Title Standard Class Order
    GB/T 44742-2024 Determination of sea cucumber polysaccharides in sea cucumbers and their products - High performance liquid chromatography {译}
    海参及其制品中海参多糖的测定-高效液相色谱法
    China National Standards
    Determination the poly

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    GB/T 39560.303-2024 Determination of certain substances in electrical and electronic products - Part 3-3: Gas chromatography-mass spectrometry with pyrolysis/thermal desorption - (Py/TD-GC-MS) Screening of polybrominated biphenyls, polybrominated diphenyl ethers and phthalates in polymers {译}
    电子电气产品中某些物质的测定-第3-3部分:配有热裂解/热脱附的气相色谱-质谱法-(Py/TD-GC-MS)筛选聚合物中的多溴联苯、多溴二苯醚和邻苯二甲酸酯
    China National Standards
    Determination the poly

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    GB/T 39560.12-2024 Determination of certain substances in electronic and electrical products-Part 12: Simultaneous determination of polybrominated biphenyls, polybrominated diphenyl ethers and phthalates in polymers by gas chromatography-mass spectrometry {译}
    电子电气产品中某些物质的测定-第12部分:气相色谱-质谱法同时测定聚合物中的多溴联苯、多溴二苯醚和邻苯二甲酸酯
    China National Standards
    Determination the poly

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    GB/T 33285.2-2024 Leather and fur - Determination of alkylphenols and alkylphenol polyoxyethylene ethers - Part 2: Indirect method {译}
    皮革和毛皮-烷基酚及烷基酚聚氧乙烯醚的测定-第2部分:间接法
    China National Standards
    Determination the poly

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    GB/T 42918.2-2023 Plastics - Thermoplastic polyurethanes for molding and extrusion - Part 2: Specimen preparation and property determination {译}
    塑料 模塑和挤出用热塑性聚氨酯 第2部分:试样制备和性能测定
    China National Standards
    Determination the poly

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    GB/T 40384-2021 Plastics—Determination of the transient extensional viscosity of polymer melts
    塑料 聚合物熔体瞬态拉伸黏度的测定
    China National Standards
    Determination the poly

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    GB/T 39715.3-2021 Plastics—Biobased content—Part 3:Determination of biobased synthetic polymer content
    塑料 生物基含量 第3部分:生物基合成聚合物含量的测定
    China National Standards
    Determination the poly

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    GB/T 33047.3-2021 Plastics—Thermogravimetry (TG) of polymers—Part 3: Determination of the activation energy using the Ozawa-Friedman plot and analysis of the reaction kinetics
    塑料 聚合物热重法(TG) 第3部分:使用 Ozawa-Friedman 绘图测定活化能和分析反应动力学
    China National Standards
    Determination the poly

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    GB/T 33047.2-2021 Plastics—Thermogravimetry (TG) of polymers—Part 2: Determination of activation energy
    塑料 聚合物热重法(TG) 第2部分:活化能的测定
    China National Standards
    Determination the poly

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    GB/T 29614-2021 Vulcanized rubber—Determination the content of polycyclic aromatic hydrocarbons
    硫化橡胶 多环芳烃含量的测定
    China National Standards
    Determination the poly

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    GB/T 40632-2021 The determination for polysaccharides in bamboo leaves
    竹叶中多糖的检测方法
    China National Standards
    Determination the poly

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    GB/T 40971-2021 Methods for the determination of prohibited substance in furniture products and related materials—Polycyclic aromatic hydrocarbons
    家具产品及其材料中禁限用物质测定方法 多环芳烃
    China National Standards
    Determination the poly

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    GB/T 40722.2-2021 Styrene-butadiene rubber(SBR) -- Determination of the microstructure of solution-polymerized SBR -- Part 2: FTIR with ATR method
    苯乙烯-丁二烯橡胶(SBR)? 溶液聚合SBR微观结构的测定? 第2部分:红外光谱ATR 法
    China National Standards
    Determination the poly

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    GB/T 39560.8-2021 Determination of certain substances in electrical and electronic products—Part 8:Phthalates in polymers by gas chromatography-mass spectrometry (GC-MS),gas chromatography-mass spectrometry using a pyrolyzer/thermaldesorption accessory (Py/TD-GC-MS)
    电子电气产品中某些物质的测定 第8部分:气相色谱-质谱法(GC-MS)与配有热裂解/热脱附的气相色谱-质谱法 (Py/TD-GC-MS)测定聚合物中的邻苯二甲酸酯
    China National Standards
    Determination the poly

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    GB/T 39560.702-2021 Determination of certain substances in electrical and electronic products—Part 7-2:Hexavalent chrome—Determination of hexavalent chrome[Cr(VI)]in polymers and electronics by the colormetric method
    电子电气产品中某些物质的测定 第7-2部分:六价铬 比色法测定聚合物和电子件中的六价铬[Cr(VI)]
    China National Standards
    Determination the poly

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    GB/T 1232.3-2021 Rubber,unvulcanized—Determinations using a shearing-disc viscometer—Part 3:Determination of the Delta Mooney value for non-pigmented,oil-extended emulsion-polymerized SBR
    未硫化橡胶 用圆盘剪切黏度计进行测定 第3部分:无填料的充油乳液聚合型苯乙烯-丁二烯橡胶Delta门尼值的测定
    China National Standards
    Determination the poly

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    GB/T 39506-2020 Determination of the poly vinyl chloride (PVC) content of unplasticized poly vinyl chloride (PVC-U) pipes and fittings—Method based on total chlorine content
    硬聚氯乙烯(PVC-U)管材及管件中聚氯乙烯(PVC)含量的测定 基于总氯含量的方法
    China National Standards
    Determination the poly

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    GB/T 39560.6-2020 Determination of certain substances in electrical and electronic products—Part 6: Polybrominated biphenyls and polybrominated diphenyl ethers in polymers by gas chromatography-mass spectrometry(GC-MS)
    电子电气产品中某些物质的测定 第6部分:气相色谱-质谱仪(GC-MS)测定聚合物中的多溴联苯和多溴二苯醚
    China National Standards
    Determination the poly

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    GB/T 1632.4-2020 Plastics—Determination of the viscosity of polymers in dilute solution using capillary viscometers—Part 4:Polycarbonate(PC) moulding and extrusion materials
    塑料 使用毛细管黏度计测定聚合物稀溶液黏度 第4部分:聚碳酸酯(PC)模塑和挤出材料
    China National Standards
    Determination the poly

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    GB/T 3780.28-2020 Carbon black—Part 28: Determination the content of polycyclic aromatic hydrocarbons
    炭黑 第28部分:多环芳烃含量的测定
    China National Standards
    Determination the poly

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    GB/T 38273.2-2019 Plastics—Thermoplastic polyester/ester and polyether/ester elastomers for moulding and extrusion—Part 2: Preparation of test specimens and determination of properties
    塑料 热塑性聚酯/酯和聚醚/酯模塑和挤塑弹性体 第2部分:试样制备和性能测定
    China National Standards
    Determination the poly

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    GB/T 12009.5-2016 (Plastics - Aromatic isocyanates for the production of polyurethane - Part 5: Determination of acidity - amendment No. 1)
    塑料 聚氨酯生产用芳香族异氰酸酯 第5部分:酸度的测定《第1号修改单》
    China National Standards
    Determination the poly

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    GB/T 18476-2019 Polyolefin pipes for the conveyance of fluids—Determination of resistance to crack propagation—Test method for slow crack growth(notch test)
    流体输送用聚烯烃管材 耐裂纹扩展的测定 慢速裂纹增长的试验方法(切口试验)
    China National Standards
    Determination the poly

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    GB/T 37639-2019 Determination of polybrominated biphenyls and polybrominated diphenyl ethers in plastic products—Gas chromatography and mass spectrometry
    塑料制品中多溴联苯和多溴二苯醚的测定 气相色谱-质谱法
    China National Standards
    Determination the poly

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    GB/T 37638-2019 Determination of polybrominated biphenyls and polybrominated biphenyl ethers in plastic products—High performance liquid chromatography
    塑料制品中多溴联苯和多溴二苯醚的测定 高效液相色谱法
    China National Standards
    Determination the poly

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    GB/T 36946-2018 Leather—Chemical tests—Determination of polycyclic aromatic hydrocarbons—Gas chromatography-mass spectrometry
    皮革-化学试验-多环芳烃的测定-气相色谱-质谱法
    China National Standards
    Determination the poly

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    GB/T 37196-2018 Plastics—Polyether polyols/polymeric polyols—Determination of aldehydes and ketones
    塑料-聚醚多元醇聚合物多元醇-醛酮含量的测定
    China National Standards
    Determination the poly

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    GB/T 35859-2018 Determination of ethylene glycol monoethyl ether insoluble contents in polymer materials for offset printing plates—Filtering method
    胶印版材用高聚物中乙二醇单乙醚不溶物含量的测定 过滤法
    China National Standards
    Determination the poly

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    GB/T 14837.3-2018 Rubber and rubber products—Determination of the composition of vulcanizates and uncured compounds by thermogravimetry—Part 3:Hydrocarbon rubbers,halogenated rubbers and polysiloxane rubbers after extraction
    橡胶和橡胶制品 热重分析法测定硫化胶和未硫化胶的成分 第3部分:抽提后的烃橡胶、卤化橡胶、聚硅氧烷类橡胶
    China National Standards
    Determination the poly

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    GB/T 34691.2-2017 Plastics—Thermoplastic polyester (TP) moulding and extrusion materials—Part 2: Preparation of test specimens and determination of properties
    塑料 热塑性聚酯(TP)模塑和挤出材料 第2部分:试样制备和性能测定
    China National Standards
    Determination the poly

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    GB/T 13747.1-2017 Methods for chemical analysis of zirconium and zirconium alloys—Part 1:Determination of tin content—Potassium iodate titration and phenylfluorone-polyethylene glycoloctyl phenyl ether spectrophotometry
    锆及锆合金化学分析方法 第1部分:锡量的测定 碘酸钾滴定法和苯基荧光酮-聚乙二醇辛基苯基醚分光光度法
    China National Standards
    Determination the poly

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    GB/T 32477-2016 Plastics—Determination of total chlorine content in toluene diisocyanates for use in the production of polyurethanes
    塑料 用于聚氨酯生产的甲苯二异氰酸酯中总氯含量的测定
    China National Standards
    Determination the poly

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    GB/T 32471-2016 Plastics—Determination of the isomer ratio in toluene diisocyanates for use in the production of polyurethanes
    塑料 用于聚氨酯生产的甲苯二异氰酸酯异构比的测定
    China National Standards
    Determination the poly

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    GB/T 12009.5-2016 Plastics—Aromatic isocyanates for use in the production of polyurethane—Part 5: Determination of acidity
    塑料 聚氨酯生产用芳香族异氰酸酯 第5部分:酸度的测定
    China National Standards
    Determination the poly

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    GB/T 12009.4-2016 Plastics—Aromatic isocyanates for use in the production of polyurethane—Part 4: Determination of isocyanate content
    塑料 聚氨酯生产用芳香族异氰酸酯 第4部分:异氰酸根含量的测定
    China National Standards
    Determination the poly

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    GB/T 12009.2-2016 Plastics—Aromatic isocyanates for use in the production of polyurethane—Part 2: Determination of hydrolysable chlorine
    塑料 聚氨酯生产用芳香族异氰酸酯 第2部分:水解氯的测定
    China National Standards
    Determination the poly

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    GB/T 32462-2015 Determination of the migration of antimony in polyester resin and products—Atomic fluorescence spectrophotometer
    聚酯树脂及其成型品中锑迁移量的测定 原子荧光光度法
    China National Standards
    Determination the poly

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    GB/T 31816-2015 Water treatment chemicals—Determination of the molecular weight and molecular weight distribution of polymers—Gel filtration chromatography
    水处理剂 聚合物分子量及其分布的测定 凝胶色谱法
    China National Standards
    Determination the poly

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    GB/T 14837.1-2014 Rubber and rubber products―Determination of the composition of vulcanizates and uncured compounds by thermogravimetry―Part 1:Butadiene, ethylene-propylene copolymer and terpolymer, isobutene-isoprene, isoprene and styrene-butadiene rubbers
    橡胶和橡胶制品 热重分析法测定硫化胶和未硫化胶的成分 第1部分:丁二烯橡胶、乙烯-丙烯二元和三元共聚物、异丁烯-异戊二烯橡胶、异戊二烯橡胶、苯乙烯-丁二烯橡胶
    China National Standards
    Determination the poly

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    GB/T 30925-2014 Plastics―Ethylene-vinyl acetate copolymer(EVAC) thermoplastics―Determination of vinyl acetate content
    塑料 乙烯-乙酸乙烯酯共聚物(EVAC)热塑性塑料 乙酸乙烯酯含量的测定
    China National Standards
    Determination the poly

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    GB/T 30794-2014 Determination of polyvinylidene fluoride (PVDF) content of hot-melt fluorocarbon resin coatings (dry film)—Dropping of the melting temperature
    热熔型氟树脂涂层(干膜)中聚偏二氟乙烯(PVDF)含量测定 熔融温度下降法
    China National Standards
    Determination the poly

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    GB/T 29616-2013 Thermoplastic elastomer - Determination of polycyclic aromatic hydrocarbons - Gas chromatography-mass spectrometry
    热塑性弹性体 多环芳烃的测定 气相色谱-质谱法
    China National Standards
    Determination the poly

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    GB/T 29614-2013 Determination the content of polycyclic aromatic hydrocarbonsin vulcanized rubber compounds
    硫化橡胶中多环芳烃含量的测定
    China National Standards
    Determination the poly

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    GB/T 29610-2013 Rubber products - Determination of polybrominated biphenyls and polybrominated diphenyl ethers - Gas chromatography and mass spectrometry
    橡胶制品 多溴联苯和多溴二苯醚的测定 气相色谱-质谱法
    China National Standards
    Determination the poly

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    GB/T 29493.1-2013 Determination of harmful substances in textile dyeing and finishing auxiliaries - Part 1: Determination of polybrominated biphenyl and polybrominated diphenyl ethers GC/MS method
    纺织染整助剂中有害物质的测定 第1部分: 多溴联苯和多溴二苯醚的测定 气相色谱-质谱法
    China National Standards
    Determination the poly

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    GB/T 28728-2012 Determination of the microstructure of solution-polymerized SBR
    溶液聚合苯乙烯-丁二烯橡胶(SSBR)微观结构的测定
    China National Standards
    Determination the poly

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    GB/T 2402-2012 Cationic dyes - Determination of staining other fibers at polyacrylonitrile fiber dyeing
    阳离子染料 染腈纶时对其他各种织物沾色的测定
    China National Standards
    Determination the poly

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    GB/T 27843-2011 Chemicals - Determination of the low molecular weight content of a polymer using Gel permeation chromatography(GPC)
    化学品 聚合物低分子量组分含量测定 凝胶渗透色谱法(GPC)
    China National Standards
    Determination the poly

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    GB/T 26125-2011 Electrical and electronic products - Determination of six regulated substances (lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers)
    电子电气产品 六种限用物质(铅、汞、镉、六价铬、多溴联苯和多溴二苯醚)的测定
    China National Standards
    Determination the poly

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    GB/T 12689.1-2010 Methods for chemical analysis of zinc and zinc alloys - Part 1: Determination of aluminum content - Chromazurol S-polyethylene glycol octyl phenylether-cetylpyridine bromine spectrophotometry, Chromeazurol S spectrophotometric method and EDTA titrimetry
    锌及锌合金化学分析方法 第1部分:铝量的测定 铬天青S-聚乙二醇辛基苯基醚-溴化十六烷基吡啶分光光度法、CAS分光光度法和EDTA滴定法
    China National Standards
    Determination the poly

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    GB/T 1632.3-2010 Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometer - part3: Polyethylenes and polypropylenes
    塑料 使用毛细管黏度计测定聚合物稀溶液黏度 第3部分:聚乙烯和聚丙烯
    China National Standards
    Determination the poly

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    GB/T 12008.7-2010 Plastics - Polyether polyols - Part 7:Determination of viscosity
    塑料 聚醚多元醇 第7部分:粘度的测定
    China National Standards
    Determination the poly

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    GB/T 12008.6-2010 Plastics - Polyether polyols - Part 6: Determination of degree of unsaturation
    塑料 聚醚多元醇 第6部分:不饱和度的测定
    China National Standards
    Determination the poly

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    GB/T 12008.5-2010 Plastics - Polyether polyols - Part 5:Determination of acidity as acid number
    塑料 聚醚多元醇 第5部分:酸值的测定
    China National Standards
    Determination the poly

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    GB/T 24167-2009 Determination of the content of polychloriznated toluenes in dye products
    染料产品中氯化甲苯的测定
    China National Standards
    Determination the poly

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    GB/T 24165-2009 Determination of the content of polychlorinated biphenyls in dye products
    染料产品中多氯联苯的测定
    China National Standards
    Determination the poly

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    GB/T 24164-2009 Determination of the content of polychloriznated benzenes in dye products
    染料产品中多氯苯的测定
    China National Standards
    Determination the poly

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    GB/T 12008.4-2009 Plastics - Polyether polyols - Part 4: Determination of sodium and potassium
    塑料 聚醚多元醇 第4部分:钠和钾的测定
    China National Standards
    Determination the poly

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    GB/T 12008.3-2009 Plastics - Polyether polyols - Part 3: Determination of hydroxyl number
    塑料 聚醚多元醇 第3部分:羟值的测定
    China National Standards
    Determination the poly

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    GB/T 23442-2009 Determination of structure and morphology for the precursors of polyacrylonitrile-based carbon fibers
    聚丙烯腈基碳纤维原丝结构和形态的测定
    China National Standards
    Determination the poly

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    GB/T 22983-2008 Determination of six polyether antibiotics residues in milk and milk powder - LC-MS-MS method
    牛奶和奶粉中六种聚醚类抗生素残留量的测定 液相色谱-串联质谱法
    China National Standards
    Determination the poly

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    GB/T 1632.5-2008 Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 5 : Thermoplastic polyester(TP) homopolymers and copolymers
    塑料 使用毛细管粘度计测定聚合物稀溶液粘度 第5部分:热塑性均聚和共聚型聚酯(TP)
    China National Standards
    Determination the poly

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    GB/T 22313-2008 Plastics - Polyols for use in the production of polyurethan - Determination of water content
    塑料 用于聚氨酯生产的多元醇 水含量的测定
    China National Standards
    Determination the poly

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    GB/T 1632.1-2008 Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part1:General principles
    塑料 使用毛细管粘度计测定聚合物稀溶液粘度 第1部分:通则
    China National Standards
    Determination the poly

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    GB/T 2412-2008 Plastics - Polypropylene(PP) and propylene copolymer thermoplastics - Determination of isotactic index
    塑料 聚丙烯(PP)和丙烯共聚物热塑性塑料等规指数的测定
    China National Standards
    Determination the poly

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    GB/T 21993-2008 Polyvinyl chloride resins - Determination of the content of methanol or ethanol extract
    聚氯乙烯树脂 甲醇或乙醇萃取物含量的测定
    China National Standards
    Determination the poly

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    GB/T 21989-2008 Plastics - Poly(vinyl chloride)pastes - Determination of apparent viscosity using the severs rheometer
    塑料 聚氯乙烯糊 用Severs流变仪测定表观黏度
    China National Standards
    Determination the poly

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    GB/Z 21276-2007 Determination of restricted substances - Polybrominated biphenyls and polybrominated diphenyl ethers in electrical and electronic equipment
    电子电气产品中限用物质多溴联苯(PBBs)、多溴二苯醚(PBDEs)检测方法
    China National Standards
    Determination the poly

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    GB/T 3401-2007 Determination of the viscosity of Poly(vinyl chloride) resins in dilute solution using capillary viscometers
    用毛细管黏度计测定聚氯乙烯树脂稀溶液的黏度
    China National Standards
    Determination the poly

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    GB/T 21059-2007 Plastics - polymers/resins in the liquid state or as emulsions or dispersions - Determination of viscosity using a rotational viscometer with defined shear rate
    塑料 液态或乳液态或分散体系聚合物/树脂 用旋转黏度计在规定剪切速率下黏度的测定
    China National Standards
    Determination the poly

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    GB/T 20500-2006 Method for the determination of di(2-ethylhexyl) adipate and di-n-octyl adipate in polyvinyl chloride film
    聚氯乙烯膜中己二酸二(2―乙基)己酯与己二酸二正辛酯含量的测定
    China National Standards
    Determination the poly

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    GB/T 20499-2006 Method for the determination of di (2-ethylhexyl) adipate migrating from polyvinyl chloride film in contact with foodstuffs
    食品包装用聚氯乙烯膜中己二酸二(2-乙基)己酯迁移量的测定
    China National Standards
    Determination the poly

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    GB/T 20387-2006 Textiles―Determination of the content of polychlorinated biphenyls (PCBs)
    纺织品 多氯联苯的测定
    China National Standards
    Determination the poly

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    GB/T 20364-2006 Determination of polyether ionophore residues in products of animal origin
    动物源产品中聚醚类残留量的测定
    China National Standards
    Determination the poly

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    GB/T 19810-2005 Polyethylene(PE)pipe and fittings-Determination of the tensile strength and failure mode of test pieces from a butt-fused joint
    聚乙烯(PE)管材和管件 热熔对接接头 拉伸强度和破坏形式的测定
    China National Standards
    Determination the poly

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    GB/T 12004.4-2003 Polyvinyl chloride paste--Determination of apparent viscosity by the Brookfield test method
    聚氯乙烯增塑糊表观粘度的测定 Brookfield试验法
    China National Standards
    Determination the poly

    English PDF
    GB/T 5009.152-2003 Determination of residual acrylonitrile monomer in styrene-acrylonitrile copolymers and rubber-modified acrylonitrile-butadiene-styrene resins and their products used for food packaging
    食品包装用苯乙烯-丙烯腈共聚物和橡胶改性的丙烯腈-丁二烯-苯乙烯树脂及其成型品中残留丙烯腈单体的测定
    China National Standards
    Determination the poly

    English PDF
    GB/T 8804.3-2003 Thermoplastic pipes--Determination of tensile properties--Part 3: Polyolefin pipes
    热塑性塑料管材 拉伸性能测定 第3部分: 聚烯烃管材
    China National Standards
    Determination the poly

    English PDF
    GB/T 8804.2-2003 Thermoplastic pipes--Determination of tensile properties--Part 2: Pipes made of unplasticized poly(vinyl chloride)(PVC-U),chlorinated poly(vinyl chloride)(PVC-C)and high-impact poly(vinyl chloride)(PVC-HI)
    热塑性塑料管材 拉伸性能测定 第2部分: 硬聚氯乙烯(PVC-U)、氯化聚氯乙烯(PVC-C)和高抗冲聚氯乙烯(PVC-HI)管材
    China National Standards
    Determination the poly

    English PDF
    GB/T 9349-2002 Determination of thermal stabitity of poly(vinyl chloride) related chlorine-containing homopolymers and copolymers and their compounds--Discoloration method
    聚氯乙烯、相关含氯均聚物和共聚物及其共混物热稳定性的测定 变色法
    China National Standards
    Determination the poly

    English PDF
    GB/T 2917.1-2002 Determination of compounds and products based on vingl chloride homopolymers and copolymers to evolve hydrogen chloride and any other acidic products at elevoted temperatures--Congo red method
    以氯乙烯均聚和共聚物为主的共混物及制品在高温时放出氯化氢和任何其他酸性产物的测定 刚果红法
    China National Standards
    Determination the poly

    English PDF
    GB/T 18476-2001 Polyolefin pipes for the conveyance of fluids--Determination of resistance to crack propagation--Test method for slow crack growth on notched pipes(notch test)
    流体输送用聚烯烃管材 耐裂纹扩展的测定 切口管材裂纹慢速增长的试验方法(切口试验)
    China National Standards
    Determination the poly

    English PDF
    GB/T 18474-2001 Pipes and fittings made of crosslinked polyethylene(PE-X)--Estimation of the degree of crosslinkingby determination of the gel content
    交联聚乙烯(PE-X)管材与管件 交联度的试验方法
    China National Standards
    Determination the poly

    English PDF
    GB/T 13021-1991 Determination for the carbon black content of polyethylene pipes and fittings by calcination and pyrolysis
    聚乙烯管材和管件炭黑含量的测定 热失重法
    China National Standards
    Determination the poly

    English PDF
    GB/T 12009.4-2016 (Plastics - Aromatic isocyanates for the production of polyurethane - Part 4: Determination of isocyanate content - amendment No. 1)
    塑料 聚氨酯生产用芳香族异氰酸酯 第4部分:异氰酸根含量的测定《第1号修改单》
    China National Standards
    Determination the poly

    English PDF

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