GB/T 42918.1-2023 PDF in English
GB/T 42918.1-2023 (GB/T42918.1-2023, GBT 42918.1-2023, GBT42918.1-2023)
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Plastics - Thermoplastic polyurethanes for moulding and extrusion - Part 1: Designation system and basis for specifications
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Standards related to (historical): GB/T 42918.1-2023
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GB/T 42918.1-2023: PDF in English (GBT 42918.1-2023) GB/T 42918.1-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
CCS G 31
GB/T 42918.1-2023 / ISO 16365-1:2014
Plastics - Thermoplastic polyurethanes for moulding and
extrusion - Part 1: Designation system and basis for
specifications
(ISO 16365-1:2014, IDT)
ISSUED ON: AUGUST 06, 2023
IMPLEMENTED ON: MARCH 01, 2024
Issued by: State Administration for Market Regulation.
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Designation system ... 6
5 Designation examples ... 12
References ... 14
Foreword
This document was drafted in accordance with the provisions of 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 42918 "Plastics - Thermoplastic polyurethanes for
moulding and extrusion". GB/T 42918 has released the following parts:
- Part 1: Designation system and basis for specifications.
This document identically adopts ISO 16365-1:2014 "Plastics - Thermoplastic
polyurethanes for moulding and extrusion - Part 1: Designation system and basis for
specifications".
A "Terms and definitions" chapter is added to this document.
Please note that some content in this document may be subject to patents. The publisher
of this document assumes no responsibility for identifying patents.
This document was proposed by China Petroleum and Chemical Industry Federation.
This document shall be under the jurisdiction of the National Plastics Standardization
Technical Committee (SAC/TC 15).
Drafting organizations of this document: Liming Chemical Research and Design
Institute Co., Ltd., Wanhua Chemical Group Co., Ltd., Meirui New Materials Co., Ltd.,
Asahikawa Chemical (Suzhou) Co., Ltd., Zhejiang Huafeng Thermoplastic
Polyurethane Co., Ltd., Zhejiang Hexin Technology Co., Ltd., Shanghai Fujia Fine
Chemical Co., Ltd., Shanghai Yida New Materials Co., Ltd., Shandong Kelimei
Industrial Co., Ltd., Yantai Zhenghai Hetai Technology Co., Ltd.
The main drafters of this document: Shi Dandan, Yang Li, Song Hongwei, Zhang Dahua,
Jin Meijin, Shi Lei, Li Wendong, Guan Yisi, Xue Dong, Wang Keqiang.
Plastics - Thermoplastic polyurethanes for moulding and
extrusion - Part 1: Designation system and basis for
specifications
1 Scope
This document establishes the designation system for thermoplastic polyurethane
elastomers used in molding and extrusion, AND provides a table of designation codes
for thermoplastic polyurethane elastomers.
This document applies to the designation of all thermoplastic polyurethane elastomer
materials, which are normally used in powder, granular or spherical forms. It serves as
the basis for determining product specifications. These materials are unmodified or
modified with colorants, fillers or additives.
Different types of thermoplastic polyurethanes are distinguished by different grades of
the following properties:
a) Hardness;
b) Tensile elastic modulus (optional).
Information on the alternation of hard and soft segments in the main chain, intended
applications and/or processing methods, important properties, additives, colors, fillers,
reinforcements are also relevant for the designation and classification of thermoplastic
polyurethanes.
This document does not imply that materials designated identically will necessarily
have the same properties. This document does not provide the engineering data,
performance data, processing condition data, which is required to specify the material
for a particular application and/or processing method. When necessary, determine these
additional properties according to the appropriate methods in ISO 16365-2.
In order to describe the special use or recyclable processing of certain thermoplastic
elastomers, additional requirements are given in character group 5 (see 4.1 and 4.6).
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
ISO 527 (all parts) Plastics - Determination of tensile properties
Note: GB/T 1040 (all parts) Plastics - Determination of tensile properties [ISO 527 (all
parts)]
ISO 868 Plastics and ebonite - Determination of indentation hardness by means of
a durometer (Shore hardness)
Note: GB/T 2411-2008 Plastics and ebonite - Determination of indentation hardness by
means of a durometer (shore hardness) (ISO 868:2003, IDT)
ISO 1043-4 Plastics - Symbols and abbreviated terms - Part 4: Flame retardants
Note: GB/T 1844.4-2008 Plastics - Symbols and abbreviated terms - Part 4: Flame
retardants (ISO 1043-4:1998, IDT)
ISO 16365-2 Plastics - Thermoplastic polyurethanes forming and extrusion - Part 2:
Preparation of test specifications and determination of properties
ISO 18064 Thermoplastic elastomers - Nomenclature and abbreviated terms
Note: GB/T 22027-2008 Thermoplastic elastomers - Nomenclature and abbreviated terms
(ISO 18064:2003, IDT)
3 Terms and definitions
There are no terms or definitions to be defined in this document.
4 Designation system
4.1 General
The designation system for polyurethanes is based on the following standardized
schema, see Figure 1.
The designation includes an optional description group and identification group, which
is marked as "thermoplastic"; the identification group includes a national standard
number group and a single item group. For clarity of designation, single item groups
are subdivided into 5 character groups.
- Character group 1: Identification of thermoplastic polyurethane, according to the
abbreviation symbol (TPU) defined in ISO 18064 and optionally the alternating
information of hard and soft segments in the main chain (see 4.2).
- Character group 2: Filling material or reinforcing material, containing the outlined
nominal content (see 4.3):
● Important properties, modifiers, flame retardants (see 4.3);
● Recycling statement: R followed by a number representing the mass percentage
of recycled materials (see 4.3).
- Character group 3: Application and processing:
● Position 1: Processing method (see 4.4).
● Position 2 and beyond: Additives, supplementary information, other properties
(see 4.4).
- Character group 4: Design performance (see 4.5):
● Hardness;
● Modulus.
- Character group 5: For classification purposes, a fifth character group containing
additional information may be used (see 4.6). The type of information used and the
code-letters are not the subject of this document.
The first character of a single item group shall be a hyphen. The 5 character groups
shall be separated by commas. If a certain character group is missing, double delimiters
(,,) shall be used to identify it, such as using two commas. The trailing comma can be
omitted.
For partial tags, use the first two character groups of the designation, connected by a
hyphen which is placed between the symbols '>' and '< ', with no spaces between the
symbols.
See Figure 2 for designation examples.
4.3 Character group 2
In character group 2, the types of fillers and reinforcing materials are represented by a
single letter code; their physical form is represented by a second letter code. These letter
codes are detailed in Table 1. It can be followed (without spaces) by a two-digit code
indicating the mass content.
Mixtures of fillers of multiple materials or physical forms can be represented by a
combination of "+" connecting the relevant codes in the brackets, followed by the total
content of the fillers outside the brackets. For example, a mixture consisting of 25%
glass fiber (GF) and 10% mineral powder (MD) shall be expressed as (GF + MD) 35.
By separating the code of the reinforcing material with a space, the flame retardant or
flame retardancy is represented by the code FR, where the type of flame retardant in
compliance with ISO 1043-4 is given in the form of a 2-letter code in brackets.
When no flame retardant code is used, the recyclability statement is separated from the
flame retardant or reinforcing material code by a space. The recycling description is
represented by the letter "R" followed by brackets (R). The mass content can follow the
code name R. For example, a TPU containing 20% glass fiber and made from a mass
fraction of at least 70% recycled content and 30% original raw materials is expressed
as TPU-GF20 (R70).
4.4 Character group 3
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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