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GB/T 2546.1-2006 English PDF (GBT2546.1-2006)

GB/T 2546.1-2006 English PDF (GBT2546.1-2006)

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GB/T 2546.1-2006: Plastics -- Polypropylene (PP) moulding and extrusion materials -- Part 1: Designation system and basis for specifications
This Part of GB/T 2546 establishes a system of designation for polypropylene (PP) thermoplastic material, which may be used as the basis for specifications. The types of polypropylene thermoplastic materials are differentiated from each other by a classification system based on appropriate levels of the designatory properties, and on information about the intended application and/or method of processing, important properties, additives, colorants, fillers and reinforcing materials.
GB/T 2546.1-2006
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
G 31
Replacing GB/T 2546-1988
Plastics - Polypropylene (PP) Moulding and Extrusion
Materials - Part 1: Designation System and Basis for
Specification
(ISO 1873-1:1995, MOD)
ISSUED ON: JANUARY 23, 2006
IMPLEMENTED ON: NOVEMBER 01, 2006
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 6
3 Designation and Specification System ... 6
4 Examples of Designations ... 10
Foreword
GB/T 2546 Plastics – Polypropylene (PP) Moulding and Extrusion Materials can be divided into the following two parts:
--- Part 1: Designation System and Basis for Specifications;
--- Part 2: Preparation of Test Specimens and Determination of Properties. This Part belongs to Part 1 of GB/T 2546.
This Part modifies and uses ISO 1873-1:1995 Plastics – Polypropylene (PP) Moulding and Extrusion Materials – Part 1: Designation System and Basis for Specifications (English Version). The structure of this Part is fully the same as ISO 1873-1:1995. Compared with ISO 1873-1:1995, this Part has the major technical differences as follows:
--- In 1.2, change the “impact strength” into “notched/un-notched Charpy impact strength”, so that make the standard consistent;
--- In Clause 2 Normative References, change “ISO 1133:1991” into “GB/T 3682- 2000 (idt ISO 1133:1997)”;
--- In Clause 3 Designation Mode, omit the optional data block: “thermoplastic” and “international standard number”;
--- In 3.3.1, change “the possible values of tensile elastic modulus are divided into 6 grades according to their ranges, and each grade is coded with 2-figure; the specific regulations are shown in Table 3” into “tensile elastic modulus is coded by 3-figure basing on the nominal values”. The Table 3 contents are modified accordingly;
--- In 3.3.2, change “the possible values of notched/un-notched Charpy impact strength are divided into 6 grades according to their ranges; each grade is coded with 2-figure” into “notched/un-notched Charpy impact strength is coded by 2- figure basing on the nominal values”. The Table 4 contents are modified accordingly;
--- In 3.3.3, add MFR test condition P “temperature: 230°C, load: 5kg”; change “the possible values of melt mass-flow rate (MFR) is divided into 11 grades; each grade is coded with 3-figure; the specific regulations are shown in Table 3” into “the melt mass-flow rate (MFR) is coded by one letter and 3-figure basing on the nominal values”. The Table 5 contents are modified accordingly.
This Part replaced GB/T 2546-1988 Designation of Polypropylene and Propylene Plastics - Polypropylene (PP) Moulding and Extrusion
Materials - Part 1: Designation System and Basis for
Specification
1 Scope
1.1 This Part of GB/T 2546 establishes a system of designation for polypropylene (PP) thermoplastic material, which may be used as the basis for specifications. 1.2 The types of polypropylene thermoplastic materials are differentiated from each other by a classification system based on appropriate levels of the designatory properties, and on information about the intended application and/or method of processing, important properties, additives, colorants, fillers and reinforcing materials. a) tensile elastic modulus;
b) notched/un-notched Charpy impact strength;
c) melt mass-flow rate (MFR).
1.3 This Part is applicable to all propylene homopolymers and to copolymers of propylene with a content of other 1-olefins of less than 50 % (m/m), as well as blends of polymers containing at least 50 % (m/m) of aforementioned polymers.
This Part applies to materials ready for normal use in the form of powder, granules or pellets and to materials unmodified or modified by colorants. additives, fillers, etc. This Part does not apply to propylene-based rubber.
1.4 This Part is not intended to imply that materials having the same designation give necessarily the same performance. This Part does not provide engineering data, performance data or data on processing conditions which may be required to specify a material for a particular application and/or method of processing.
If such additional properties are required, they shall be determined in accordance with the test methods specified in Clause 2 of this Standard, if suitable.
1.5 In order to specify a thermoplastic material for a particular application or to ensure reproducible processing, additional requirements may be given in data block 5. 2 Normative References
The provisions in following documents become the provisions of this Part through reference in this Part of GB/T 2546. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Part, however, parties who reach an agreement based on this Part are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
GB/T 1844.1-1995 Symbols of Plastics and Resins - Part 1: Basic Polymers and Their Special Characteristics (neq ISO 1043-1:1987)
GB/T 1844.2-1995 Symbols of Plastics and Resins - Part 2: Fillers and Reinforcing Materials (neq ISO 1043-2:1987)
GB/T 2546.2-2003 Plastics – Polypropylene (PP) Moulding and Extrusion
Materials - Part 2: Preparation of Test Specimens and Determination of Properties (ISO 1873.2-1997, MOD)
GB/T 3682-2000 Determination of the Melt Mass-Flow Rate (MFR) and the Melt Volume-Flow Rate (MVR) of Thermoplastics (idt ISO 1133-1997)
3 Designation and Specification System
The designation and specification system for thermoplastics is based on the following standardized pattern:
Designation
Characteristic item block
Data block 1 Data block 2 Data block 3 Data block 4 Data block 5
The designation consists of 5 data blocks signalizing the characteristic item block as follows:
--- Data block 1: Identification of the plastic by its symbol PP in accordance with GB/T 1844.1 and information about the polymerization process or composition of the polymer (see 3.1).
--- Data block 2: Position 1: Intended application or method of processing (see 3.2). Positions 2 to 8: Important properties, additives and supplementary information (see 3.2).
--- Data block 3: characteristic properties (see 3.3).
--- Data block 4: Fillers or reinforcing materials and their nominal content (see 3.4).
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