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GB/T 42918.1-2023Plastics - Thermoplastic polyurethanes for moulding and extrusion - Part 1: Designation system and basis for specifications (English PDF)

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 6, 2023

Implementation date

March 1, 2024

Scope

GB/T 42918.1-2023 (Plastics - Thermoplastic polyurethanes for moulding and extrusion - Part 1: Designation system and basis for specifications) is available as an English-translated PDF.

GB/T 42918.1-2023 — 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).

Document preview — GB/T 42918.1-2023

National Standard of the People's Republic of China

Issued by: SAMR; SAC

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.

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

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

Referenced standards

Normative references

ISO 527 · GB/T 1040 · ISO 868 · GB/T 2411-2008 · ISO 1043 · GB/T 1844.4-2008 · ISO 16365 · ISO 18064 · GB/T 22027-2008

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