GB/T 22271.1-2021 PDF English (GB/T 22271.1-2008: Older version)
Search result: GB/T 22271.1-2021 (GB/T 22271.1-2008 Older version)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 22271.1-2021 | English | 170 |
Add to Cart
|
0-9 seconds. Auto-delivery.
|
Plastics - Polyoxymethylene(POM) moulding and extrusion materials - Part 1: Designation system and basis for specification
| Valid |
| GB/T 22271.1-2008 | English | 319 |
Add to Cart
|
3 days
|
Plastics -- Polyoxymethylene (POM) moulding and extrusion materials -- Part 1: Designation system and basis for specifications
| Obsolete |
PDF Preview: GB/T 22271.1-2021
GB/T 22271.1-2021: PDF in English (GBT 22271.1-2021) GB/T 22271.1-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
CCS G 31
GB/T 22271.1-2021 / ISO 29988-1:2019
Replacing GB/T 22271.1-2008
Plastics - Polyoxymethylene (POM) moulding and extrusion
materials - Part 1: Designation system and basis for
specification
基础
(ISO 29988-1:2019, IDT)
ISSUED ON: OCTOBER 11, 2021
IMPLEMENTED ON: MAY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions... 7
4 Designation and classification systems ... 7
5 Examples of designation ... 11
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 22271 "Plastics - Polyoxymethylene (POM) moulding
and extrusion materials". GB/T 22271 has released the following parts:
- Part 1: Designation system and basis for specification;
- Part 2: Preparation of test specimens and determination of properties;
- Part 3: Requirements for general materials.
This document replaces GB/T 22271.1-2008 "Plastics - Polyoxymethylene (POM)
moulding and extrusion materials - Part 1: Designation system and basis for
specifications". As compared with GB/T 22271.2-2008, except for structural
adjustment and editorial changes, the main technical changes are as follows:
a) MODIFY the normative references (see Chapter 2; Chapter 2 of the 2008 edition);
b) ADD the chapter "Terms and definitions" (see Chapter 3);
c) MODIFY the representation of naming system (see 5.1, 5.2, 5.3; 4.1, 4.2 of the
2008 edition).
This document uses the translation method, to identically adopt the ISO 29988-1:2019
"Plastics - Polyoxymethylene (POM) moulding and extrusion materials - Part 1:
Designation system and basis for specification".
The Chinese documents, that have a consistent correspondence with the international
documents, which are normatively cited in this document, are as follows:
- GB/T 1844.1-2008 Plastics - Symbols and abbreviated terms - Part 1: Basic
polymers and their special characteristics (ISO 1043-1:2001, IDT);
- GB/T 3682.1-2018 Plastics - Determination of the melt mass-flow rate (MFR) and
melt volume-flow rate (MVR) of thermoplastics - Part 1: Standard method (ISO
1133-1:2011, MOD);
- GB/T 22271.2-2021 Plastics - Polyoxymethylene (POM) moulding and extrusion
materials - Part 2: Preparation of test specimens and determination of properties
(ISO 29988-2:2018, IDT).
For ease of use, the following editorial changes have been made to this document:
- ADJUST the inappropriate numerical code, which is used for melt flow rate
Plastics - Polyoxymethylene (POM) moulding and extrusion
materials - Part 1: Designation system and basis for
specification
1 Scope
This document specifies a designation system for thermoplastic polyoxymethylene
(POM) molding and extrusion materials. This designation system can serve as a basis
for classification.
Note: The polyoxymethylene material is a thermoplastic material, which is mainly composed
of long chains of homopolymers and copolymers, as synthesized from formaldehyde. The
repeating unit in the molecular chain is -CH2O-, which is an integral part of the main polymer
chain as produced by the polymerization of formaldehyde.
Different types of polyoxymethylene materials are distinguished, based on a
classification system, by specified characteristic property values (melt mass flow rate
or melt volume flow rate, tensile modulus of elasticity), as well as basic polymer
parameters, recommended uses, processing methods, important properties, additives,
colorants, fillers, reinforcements, etc.
This document applies to all materials, which contain polyoxymethylene
homopolymers, copolymers, polyoxymethylene blends. It is suitable for general powder,
granular or flake materials, as well as unmodified and modified materials with colorants,
additives, fillers, etc. This document does not imply that, identically named materials
necessarily have identical properties.
This document does not provide engineering data, performance data, processing
condition data, of the end-application specific material. When necessary, these
additional properties can be determined, according to the test methods specified in the
relevant international standards.
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 references,
only the version corresponding to the date applies to this document; for undated
references, the latest version (including all amendments) is applicable to this document.
ISO 1043-1 Plastics - Symbols and abbreviated terms - Part 1: Basic polymers and
their special characteristics
Character group 5: For classification purposes, additional information can be added to
the 5th character group (see 4.6).
The first character of the characteristic item group shall be a hyphen. Groups of
characters shall be separated from each other, by commas ",".
If character groups are not used, they shall be separated by double commas (,,).
Note: Character group 1 and character group 2 together constitute partial marking symbols.
4.2 Character group 1
In this character group, after the hyphen, the symbol "POM" is used to represent the
polyoxymethylene plastic, according to ISO 1043-1, followed by a hyphen and the letter
code H, to identify the homopolymer, OR the letter code K, to identify the copolymer.
The blends can be made from the materials mentioned in ISO 1043-1 and/or other
polymers. For polymer blends or alloys, the abbreviation for the base polymer is used:
the main component is listed first: the other components are listed in descending order,
according to their mass fractions, separated by a "+" sign; before or after the "+" sign,
there are no spaces.
Example: A blend of polyoxymethylene homopolymer and polyethylene is designated
as: POM-H+PE.
4.3 Character group 2
In this character group, the filler and/or reinforcement material is represented by a letter
code, in position 1; the physical form is represented by a second letter code, in position
2; the letter code used is specified in Table 1. Immediately after (without spaces) the
positions 3 and 4, use two numbers as a code, to indicate its mass content.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
|