This standard specifies the naming method for polypropylene and propylene copolymer materials. This standard applies to all propylene homopolymers and propylene copolymers that are in powder or granular form under normal conditions, as well as polymer blends containing at least 50% (m/m) of the above polymers. This standard also applies to the above materials modified or unmodified by colorants, additives, fillers, reinforcing materials, etc. This standard does not apply to mixtures of propylene-based rubber or polypropylene with ethylene-propylene-diene terpolymer (EPDM), nor does it apply to masterbatches. This standard does not provide engineering data, performance data or processing conditions required for the specific application or processing methods of the material. This standard does not mean that materials with the same name must have the same properties. GB/T 2546-1988 Nomenclature of polypropylene and propylene copolymer materials GB/T2546-1988 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Designation of polypropylene and propylene copolymer materials
This standard refers to and adopts the international standard 1SO1873/11986 "Plastics - Materials - Part 1: Nomenclature".
1 Subject content and scope of application
GB/T 2546--88
Replaces GB2546-81
-Polypropylene (PP) and propylene copolymer thermoplastic wood standard specifies the naming method of polypropylene and propylene copolymer materials. This standard applies to all propylene homopolymers and propylene copolymers that are powdery or granular under normal conditions, and polymer blends containing at least 50% (m/m) of the above polymers. This standard also applies to the above materials modified or unmodified by colorants, additives, fillers, reinforcing materials, etc. This standard does not apply to mixtures of propylene-based rubber or polypropylene and ethylene-propylene-diene terpolymer (EPDM), nor to granular materials.
This standard does not provide engineering data, performance data or processing conditions required for the specific application or processing method of the material. This standard does not mean that materials with the same name must have the same performance. 2 Reference standards
(GH/T184+abbreviation code of plastics and resins. GB/T2412 Test method for isotactic index of polypropylene GB/T3682 Test method for melt flow rate of thermoplastics 3 Naming method
This naming method is based on the code of polyolefin, type of polymer, main application, isotactic index, melt flow rate and other characteristics of the material, divided into several characteristic units to form the naming of the material. The naming format is: "Characteristic unit"
Characteristic unit 2,
Characteristic unit 3
Characteristic unit 4
Characteristic unit 1: abbreviation code of polyolefin and type of polymer (see 3.1). Characteristic unit 5
Characteristic unit 2: main application or processing method of the material, important properties, additives and additional instructions (see 3.2). Special Feature 3: The nominal value of the isotactic index of the polymer, the nominal value of the melt flow rate and its test conditions (see 3.3). Feature Unit 4: Fillers, reinforcement materials and their nominal content (see 3.4). Feature Unit 5: In order to explain the problem in detail, this feature unit can be added as a supplementary explanation (see 3.5). The feature units are separated by a hyphen (-). If one feature unit is not used, two hyphens (--) are used to separate them. 3.1 Feature Unit 1
According to the provisions of GB/T1844, the abbreviation code of polypropylene is the English letter PP. The type of polymer is represented by a code as specified in Table 1. The polymer type code is written after PP, with a space for one character in the middle. Approved by China Petrochemical Corporation on June 14, 1988 and implemented on May 1, 1989
3.2 Feature Unit 2
GB/T 2546--88
Table 1 Polymer type code
Propylene homopolymer
Propylene block copolymer, containing not more than 50% (m/m) of other olefin monomers (can be multiple), no other groups except olefins Closed and internal olefin copolymerized polypropylene random copolymer, containing not more than 50% (m/m) of other olefin monomers (can be multiple), no other groups except olefins Blends of multiple polymers copolymerized with propylene, containing at least 50% (m/m) of H (propylene homopolymer), B (propylene block copolymer) or R (propylene random copolymer) The main purpose or processing method of polypropylene is written in the first position, and important properties, additives, color and state (granular or powdery) are written in the second to fifth positions. Indicated by code according to the provisions of Table 2. Natural color (uncolored) and granular materials do not need to be written, but colored (colored) and powdery materials need to be stated. Plastic materials should have general processing stability, Therefore, polypropylene containing only the necessary amount of processing stabilizer does not need to be indicated in the name.
Table 2 Codes used for characteristic unit 2
Blow molding (hollow products)
Extruded pipes, profiles and sheets
Extruded flat films and sheets
Blown films
Cable and wire insulation
Rope and wire
Rotational molding
Powder coating or sintering
Extruded flat wire|| tt||No description
Second to fifth digit
Additional stabilization
Anti-blocking
Colored
Foamable
Heat aging resistance
Metal passivation
Light and (war) weathering resistance
Impact modification
Increase transparency
Increase conductivity
Antistatic
3.3 Characteristic unit 3
GB/T 2546 --88
In this characteristic unit, the nominal value range of the polymer isotactic index is expressed by two digits (see 3.3.1). The nominal value range of the melt flow rate is expressed by a letter and a number (see 3.3.2), written after the isotactic index range. If the above two characteristic values ​​fall within or are close to a certain grade limit, the manufacturer should determine that the material is named according to a certain grade. If individual test values ​​fall within a certain limit or on either side of a certain limit due to production errors, the naming is not affected. For propylene block copolymers (B), propylene random copolymers (R) and blends of multiple polymers (Q), if the manufacturer does not need to determine their isotactic index, it can be omitted in the naming. 3.3.1 Isotactic index
Isotactic index is determined in accordance with GB/T2412. The nominal value range of isotactic index is divided into six levels, expressed in two digits, as specified in Table 3. For propylene homopolymer resin, when its isotactic index nominal value is greater than 90, it can be omitted in the naming. Table 3 Isotactic index nominal value level code and range code
3.3.2 Melt flow rate
The melt flow rate is determined in accordance with GB.T3682. The test conditions and codes for the melt flow rate of polypropylene are as specified in Table 4. Range
>80 ~ 90
>70 ~80
>60 ~70
>50 ~ 60
Table 4 Melt flow rate test conditions and their codes Code
Test temperature
Nominal load
The nominal value range of polypropylene melt flow rate is divided into 14 grades, expressed by three digits, as specified in Table 5. In the naming, the test condition code is written at the front of the grade code. When the test condition is M, it can be omitted in the naming. Table 5 Melt flow rate nominal value grade code and range Code
Range, g/10min
3.4 ​​Characteristic unit 4
GB/T2546
Continued Table 5
Range, g/10 min
20 ~25
35~ 50
In this characteristic unit, the type of filler or reinforcing material is written with a letter as a code in the first position, its physical state is written with another letter as a code in the second position (see Table 6), and its mass content is written with a two-digit code in the third position (see Table 7). Table 6 Codes for fillers and reinforcing materials
(First digit)
Calcium carbonate
Cellulose1)
Minerals1), metals1)
Synthetic organic matter
No description
(Second digit)
Spherical, beadedWww.bzxZ.net
Fiber
Granular, crushed fiber
Scale, flake
No description
Note: 1) For these materials, their chemical symbols or recognized codes can be clearly written in the fourth digit of this characteristic unit. 84
GB/T 2546—88
Table 7 Filler and reinforcement material mass content Code Mass content, % (m/m)
(first position)
7.5 ~12.5
12.5~17.5
17.5 ~ 22.5
22.5~ 27.5
>27.5 ~32.5
>32.5~37.5
37.5 ~ 42.5
42.5~ 47.5
47.5 ~ 55
>55 ~ 65
65 ~ 75
>75 ~ 85
If the filler and reinforcing material are a mixture of multiple materials or multiple states, the corresponding codes can be combined with "+" and then enclosed in brackets. For example, a mixture containing 25% (25) glass fiber (GF) and 10% (10) mineral powder (MD) can be represented by (G+M) in the first position, (F+D) in the second position, and (25+10) in the third position. 3.5 Characteristic unit 5
Contents that require additional explanation are not specified in this standard, but should be represented by the code using as few English letters as possible. 4 Naming examples
4.1 A propylene homopolymer (H), mainly used for extrusion flat yarn (T), natural color (uncolored), granular, nominal isotactic index is 96 (95), nominal melt flow rate is 2.5g/10min (022), test conditions are 230℃, 2.16kg, (M) named: PP
Characteristic unit 1: Abbreviation code
Homopolymer
Characteristic unit 2: First position: Extrusion flat yarn
Characteristic unit 3: Melt flow rate
HT-022
Name: PPH-T~ 022
4.2 A propylene block copolymer (B), natural color, granular, mainly used for injection molding (M), light resistance and (or) weathering aging (L), melt flow rate nominal value is 0.3g/10min (0.03), test conditions are 230℃, 2.16kg, (M) named: 85
GB/T 2546—88
Characteristic unit 1: Abbreviation code
Block copolymer
Characteristic unit 2: First digit: injection molding
Second digit: light resistance and (or) weathering aging Characteristic unit 3: Melt flow rate
Name: PPB-ML- 003
B- ML - 003
4.3 A propylene homopolymer (H) material filled with 40% calcium carbonate powder (KD40), granular, colored (C), with antistatic properties (Z), mainly used for extruded sheets (E), the nominal isotactic index of the base polymer is 96, the nominal melt flow rate is 0.15g/10min (001), the test condition is 230℃, 2.16kg (M) named: PP H-EZC-001-KD40
Characteristic unit 1: Abbreviation code
Homopolymer
Characteristic unit 2: First digit: Extruded sheet
Second digit: Antistatic
Third digit: Colored
Characteristic unit 3: Melt flow rate
Characteristic unit 4: First digit: Filled with calcium carbonate First digit: Powder
Third digit: Mass content
Name: PP H-EZC-001-KD40
Additional Notes:
This standard is under the jurisdiction of the National Technical Committee for Plastic Standardization, Petrochemical Plastic Resin Products Sub-Technical Committee. This standard was drafted by the Resin Application Research Institute of Beijing Yanshan Oil Chemical Company.
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