GB/T 2546.1-2022Plastics - Polypropylene (PP) moulding and extrusion materials - Part 1: Designation system and basis for specifications (English PDF)

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

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 Scopes, 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 material or

to ensure the reproducibility of processing, additional requirements may be provided in data

block 5.

2 Normative References

The contents of the following documents constitute indispensable clauses of this document

through the normative references in the text. In terms of references with a specified date, only

versions with a specified date are applicable to this document. In terms of references without a

specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 1844.1 Plastics - Symbols and Abbreviated Terms - Part 1: Basic Polymers and Their

Special Characteristics (GB/T 1844.1-2008, ISO 1043-1:2001, IDT)

GB/T 2546.2 Plastics - Polypropylene (PP) Molding and Extrusion Materials - Part 2:

Preparation of Test Specimens and Determination of Properties (GB/T 2546.2-2022, ISO

19069-2:2016, MOD)

GB/T 3682.1 Plastics - Determination of the Melt Mass-flow Rate (MFR) and Melt Volume-

flow Rate (MVR) of Thermoplastics - Part 1: Standard Method (GB/T 3682.1-2018, ISO 1133-

1:2011, MOD)

GB/T 3682.2 Plastics - Determination of the Melt Mass-flow Rate (MFR) and Melt Volume-

flow Rate (MVR) of Thermoplastics - Part 2: Method for Materials Sensitive to Time-

temperature History and / or Moisture (GB/T 3682.2-2018, ISO 1133-2:2011, MOD)

3 Terms and Definitions

This document does not have terms or definitions that need to be defined.

4 Designation and Classification System