GB/T 2546.1-2022 English PDF (GBT2546.1-2022)

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GB/T 2546.1-2022: Plastics - Polypropylene (PP) moulding and extrusion materials - Part 1: Designation system and basis for specifications
GB/T 2546.1-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
CCS G 31
Replacing GB/T 2546.1-2006
Plastics - Polypropylene (PP) Molding and Extrusion
Materials - Part 1: Designation System and Basis for
Specifications
(ISO 19069-1:2015, MOD)
ISSUED ON: JULY 11, 2022
IMPLEMENTED ON: FEBRUARY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 6
1 Scope ... 7
2 Normative References ... 8
3 Terms and Definitions ... 8
4 Designation and Classification System ... 8
5 Examples of Designation ... 14
Bibliography ... 19
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document is Part 1 of GB/T 2546 Plastics - Polypropylene (PP) Molding and Extrusion
Materials. GB/T 2546 has issued the following parts:
---Part 1: Designation System and Basis for Specifications;
---Part 2: Preparation of Test Specimens and Determination of Properties.
This document serves as a replacement of GB/T 2546.1-2006 Plastics - Polypropylene (PP)
Molding and Extrusion Materials - Part 1: Designation System and Basis for Specifications. In
comparison with GB/T 2546.1-2006, apart from structural adjustments and editorial
modifications, the main technical changes are as follows:
a) The dated normative references are modified into undated normative references (see
Chapter 2; Chapter 2 of Version 2006);
b) The designation block and standard serial No. parts are added to the designation and
classification modes (see Chapter 4; Chapter 3 of Version 2006);
c) The sequence of the individual-item block and the data block for designation is
modified (see 4.1; Chapter 3 of Version 2006);
d) In Table 2 in the data block 2, Position 2 indicates that “S” (representing scaly and
flaky) is added to the letter code of fillers and reinforcing materials (see Table 2 of
4.3; Table 6 of 3.4 of Version 2006);
e) The meaning of the letter “E” in Position 1 of the data block 3 is modified from
“extrusion” into “extrusion of pipes, profiles and sheets” (see Table 3 of 4.4; Table 2
of 3.2 of Version 2006);
f) The letter in Position 1 of the data block 3 is added, using “J” to indicate the
recommendation purpose “wire and cable insulation” (see Table 3 of 4.4; Table 2 of
3.2 of Version 2006);
g) “the tensile elastic modulus is coded with three numbers based on the nominal value”
is modified into “in accordance with the values that may appear, the tensile elastic
modulus is divided into 6 ranges, and each range is represented by a digital code
composed of two numbers, with the stipulations shown in Table 4”. The content of
Table 4 is modified accordingly (see 4.5.2 and Table 4; 3.3.1 and Table 3 of Version
2006);
h) “the Charpy notched impact strength is coded with two numbers based on the nominal
value” is modified into “in accordance with the values that may appear, the Charpy
notched impact strength is divided into 12 ranges, and each range is represented by a
digital code composed of two numbers, with the stipulations shown in Table 5”. The
content of Table 5 is modified accordingly (see 4.5.3 and Table 5; 3.3.2 and Table 4
of Version 2006);
i) “the melt mass-flow rate is coded with a letter and three numbers based on the nominal
value” is modified into “the melt mass-flow rate is determined in accordance with
GB/T 3682.1 or GB/T 3682.2. The test condition can be selected as M (temperature:
230 C, load: 2.16 kg) or P (temperature: 230 C, load: 5 kg)”. Condition P is
recommended for the determination of materials with MFR value less than 0.10 g/10
min under the test condition M. In accordance with the values that may appear, the
melt mass-flow rate is divided into 21 ranges, and each range is represented by a
digital code composed of three numbers, with the stipulations shown in Table 6. Use
“M” or “P” in front of the digital code to indicate the test condition. The content of
Table 6 is modified accordingly (see 4.5.4 and Table 6; 3.3.3 and Table 5 of Version
2006).
This document uses the re-drafting method in the modification and adoption of ISO 19069-
1:2015 Plastics - Polypropylene (PP) Molding and Extrusion Materials - Part 1: Designation
System and Basis for Specifications.
This document adds the chapter “Terms and Definitions”.
In comparison with ISO 19069-1:2015, this document has technical differences. The main
technical differences and the reasons for these differences are as follows:
a) In terms of Normative References, this document makes adjustments with technical
differences, using Chinese standards that equivalently adopt or modify international
documents to replace the corresponding international documents, so as to adapt to the
technical conditions of China. The adjustments are intensively reflected in Chapter 2
“Normative References”. See the specific adjustments below:
 Use GB/T 1844.1, which equivalently adopts international document, to replace
ISO 1043-1 (see 4.1);
 Use GB/T 2546.2, which modifies and adopts international document, to replace
ISO 1873-2 (see 4.5.2 and 4.5.3);
 Use GB/T 3682.1 and GB/T 3682.2, which modify and adopt international
documents, to replace ISO 1133 (all parts) (see 4.5.4).
b) In terms of data block 3, the description “if the polypropylene is natural color and (or)
granule, the code of natural color (N) and (or) granule (G) can be omitted in
designation” is added, so as to make the stipulations more clarified (see 4.4);
c) The test condition P “temperature: 230 C, load: 5 kg” is added to MFR, so as to make
the stipulations more reasonable (see 4.5.4);
Plastics - Polypropylene (PP) Molding and Extrusion
Materials - Part 1: Designation System and Basis for
Specifications
1 Scope
This document specifies the designation system of polypropylene (PP) thermoplastic materials,
and this system can be used as the basis for specifications.
Different types of polypropylene thermoplastic materials are distinguished by a classification
system based on the following specified characteristic property values and recommended
purposes and (or) processing methods, important properties, additives, colorants, fillers and
reinforcing materials, etc.:
a) tensile elastic modulus;
b) Charpy notched impact strength;
c) melt mass-flow rate (MFR).
This document is applicable to all propylene homopolymers and other propylene copolymers
with a mass fraction of 1-olefin monomers less than 50% and blends of the above-mentioned
polymers with a mass fraction of not less than 50%.
This document is applicable to materials that are conventionally in the form of powders,
granules or crumbs, unmodified or modified by colorants, additives and fillers, etc.
This document does not apply to propylene-based rubber.
This document does not imply that materials with the same designation will necessarily have
identical properties. This document does not provide the engineering data, property data or
processing condition data necessary to describe a particular purpose and (or) processing method
for the materials.
If necessary, these additional properties can be determined in accordance with the test methods
specified in GB/T 2546.2.
In order to illustrate a particular purpose of a certain polypropylene thermoplastic m...