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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 5761-2006 Suspension polyvinyl chloride resins of general purpose, in respect to which the following main technical changes have been made:
—Some normative references have been modified (see Clause 2; Clause 2 of 2006 edition);
—The viscosity class numbers and corresponding viscosity numbers of SG0 and SG9 in Table 1 have been removed (see Clause 3; Clause 3 of 2006 edition);
—Inspection items have been introduced and the technical indicators of some inspection items have been modified (see 4.2; 4.2 of 2006 edition);
—The technical indicators of SG0 and SG9 have been removed (see 4.2, 4.2 of 2006 edition);
—The measurement methods of some inspection items have been modified (see 6.3, 6.6 and 6.11; 5.9, 5.6 and 5.10 of 2006 edition);
—A method for determination of dry flowability has been introduced (see 6.12);
—The end-of-manufacturing inspection items were modified (see 7.1.2; 6.3.1 of 2006 edition);
—Sampling has been presented as a separate clause, and the sampling requirements have been modified (see Clause 5; subclauses 6.1 and 6.2 of 2006 edition);
—The user acceptance provision has been removed (6.4 of 2006 edition);
—The type inspection provision and inspection frequency have been modified (see 7.1.3; 6.3.2 of 2006 edition);
—Reference to the standard about numerical rounding has been modified (see 7.2.1.1; 6.3.4 of 2006 edition);
—The metering requirement on product packaging has been modified (see 8.2; 7.2 of 2006 edition).
This standard was proposed by China Petroleum and Chemical Industry Association.
This standard is under the jurisdiction of the Polyvinyl Chloride Resin Product Subcommittee of National Technical Committee on Plastic of Standardization Administration of China (SAC/TC 15/SC 7).
The previous editions of this standard are as follows:
—GB/T 5761-1986, GB/T 5761-1993 and GB/T 5761-2006.
Suspension polyvinyl chloride resins of general purpose
1 Scope
This standard specifies classification, requirements, sampling, test methods, inspection rules, marking, packaging, transportation and storage for suspension polyvinyl chloride resins of general purpose.
This standard applies to the general-purpose polyvinyl chloride resin produced by suspension process. This standard may apply to general-purpose polyvinyl chloride resins produced by bulk method.
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 191 Packaging—Pictorial marking for handling of goods
GB/T 2913 Test for whiteness of plastics
GB/T 2914 Plastics—Homopolymer and copolymer resins of vinyl chloride—Determination of volatile matter (including water)
GB/T 2915 Determination of conductivity of water extract of polyvinyl chloride resins
GB/T 2916 Plastic—Vinyl chloride homopolymer and copolymer resins—Sieve analysis using air-jet sieve apparatus
GB/T 3400 Plastics—Homopolymer and copolymer resins of vinyl chloride for general use—Determination of plasticizer absorption at room temperature
GB/T 3401 Determination of the viscosity of Poly(vinyl chloride) resins in dilute solution using capillary viscometers
GB/T 3402.1 Plastics—Homopolymer and copolymer resins of vinyl chloride—Part 1: Designation system and basis for specifications
GB/T 4611 Determination method of fish eyes for polyvinyl chloride resins of general use
GB/T 6678 General principles for sampling chemical products
GB/T 6679 General rules for sampling solid chemical products
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 9348 Plastics—Poly(vinyl chloride) resins—Determination of number of impurities and foreign particles
GB/T 15595 Polyvinyl chloride resins—Test methods for the thermal stability—Whiteness method
GB/T 20022 Plastics—Homopolymer and copolymer resins of vinyl chloride—Determination of apparent density
GB/T 21060 Plastics—Determination of pourability
GB/T 21843 Plastics—Vinyl chloride homopolymer and copolymer resins—Particle size determination by mechanical sieving
GB/T 29874 Plastics—Homopolymer and copolymer resins of vinyl chloride—Determination of residual vinyl chloride monomer by gas-chromatographic analysis of dry powder
JJF 1070 Rules of metrological testing for net quantity of products in prepackages with fixed content
3 Classification
The product classification code is composed of the four elements—product name, polymerization method, application symbol and viscosity class number (see Table 1) as specified in GB/T 3402.1. The product designation is a combination of the polymerization method, application and viscosity class number.
Table 1 Viscosity class number and viscosity
Viscosity class number (n) 1 2 3 4 5 6 7 8
Viscosity/(mL/g) 156~144 143~136 135~127 126~119 118~107 106~96 95~87 86~73
4 Requirements
4.1 Appearance, white powder.
4.2 The physical and chemical properties of the product shall meet the requirements of Table 2.
Table 2 Requirements of physical and chemical properties
No. Item Designation
SG1 SG2 SG3 SG4
Superior Good Fair Superior Good Fair Superior Good Fair Superior Good Fair
1 Viscosity/(mL/g)
(or K value)
[or average degree of polymerization]
2 Impurity particles/number ≤
3 Volatile matter (including water) content/% ≤
4 Apparent density/(g/mL) ≥
5 Residue on sieve (%) 250μm sieve mesh ≤
63μm sieve mesh ≤
6 “Fish eyes”/(number 1400 cm 2 ) ≤
7 100g resin plasticizer absorption/g ≥
8 Whiteness (160 ℃, 10 min)/% ≥
9 Conductivity of water extract/[μS/(cm · g)] ≤
10 Residual vinyl chloride monomer content/(μg/g) ≤
11 Dry flowability/min
Table 2 (continued)
No. Item Designation
SG5 SG6 SG7 SG8
Superior Good Fair Superior Good Fair Superior Good Fair Superior Good Fair
1 Viscosity/(mL/g)
(or K value)
[or average degree of polymerization]
2 Impurity particles/number ≤
3 Volatile matter (including water) content/% ≤
4 Apparent density/(g/mL) ≥
5 Residue on sieve (%) 250μm sieve mesh ≤
63μm sieve mesh ≤
6 “Fish eyes”/(number/400 cm 2 ) ≤
7 100g resin plasticizer absorption/g ≥
8 Whiteness (160 ℃, 10 min)/% ≥
9 Conductivity of water extract/[μS/(cm · g)] ≤
10 Residual vinyl chloride monomer content/(μg/g) ≤
11 Dry flowability/min
a Subject to agreement between the manufacturer and the user.
5 Sampling
5.1 Batch definition
A batch is composed of products obtained in a single kettle or uniformly mixed products from several kettles under the same polymerization conditions.
5.2 Sampling
5.2.1 For products packed in kraft paper bags lined with plastic film, polypropylene woven bags, or kraft paper and polypropylene woven fabric composite bags, the quantity of sampling units is determined in accordance with GB/T 6678. The appropriate sampling probe specified in GB/T 6679 should be used, and, for sampling, should be inserted to 3/4 of the vertical depth from the center of the packaging bag. The end-of-manufacturing inspection and type inspection by the manufacturer may be performed at appropriate intervals on the packaging line, and on representative samples which are taken by means of automatic sampler (or manually). In case of any discrepancy in product quality, sampling from the packaging bag shall be based on the quantity of sampling units specified in GB/T 6678. The sampling quantity shall be not less than 2 kg.
5.2.2 Mix the collected samples uniformly, put them in a clean, dry container (or plastic bag) and seal tightly (the samples used for the determination of residual vinyl chloride monomers shall be stored, as compacted and filled, in a tightly sealed sample bottle), and indicate: the name of the manufacturer, product name, designation, batch number or production date, sampling volume, sampling date, etc.
Foreword i
1 Scope
2 Normative references
3 Classification
4 Requirements
5 Sampling
6 Test methods
7 Inspection rules
8 Marking, packaging, transportation and storage
Annex A (Normative) Determination of average polymerization degree
