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Plastics - Polyoxymethylene(POM) moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties
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Plastics -- Polyoxymethylene (POM) moulding and extrusion materials -- Part 2: Preparation of test specimens and determination of properties
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GB/T 22271.2-2021: PDF in English (GBT 22271.2-2021) GB/T 22271.2-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.20
CCS G 31
GB/T 22271.2-2021 / ISO 29988-2:2018
Replacing GB/T 22271.2-2008
Plastics - Polyoxymethylene (POM) moulding and extrusion
materials - Part 2: Preparation of test specimens and
determination of properties
(ISO 29988-2:2018, 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 Definitions and terms ... 8
4 Preparation of specimen ... 8
5 State conditioning of specimen ... 9
6 Performance determination ... 9
Appendix NA (Informative) Chinese documents that have a consistent correspondence
with the international documents as normatively cited in this document ... 12
References ... 14
Plastics - Polyoxymethylene (POM) moulding and extrusion
materials - Part 2: Preparation of test specimens and
determination of properties
1 Scope
This document specifies methods for the preparation of test specimens AND the
determination of properties, for polyoxymethylene molding and extrusion materials.
This document specifies the handling of the tested material, as well as the state
conditioning requirements for the tested material prior to molding and the specimen
prior to testing. This document specifies the methods and conditions for specimen
preparation, as well as the method for measuring the specimen.
This document applies to POM molding and extrusion materials.
This document lists properties and test methods, for characterizing polyoxymethylene
molding and extrusion materials. These properties are selected from general test
methods. Some other particularly important or widely used test methods, for POM
molding and extrusion materials, are also covered in this document, along with
characteristic properties: melt flow rate and tensile modulus of elasticity.
In order to obtain comparable and reproducible test results, it is intended to be carried
out, in accordance with the sample preparation process and state conditioning method,
sample size, test method, which is specified in this document. Test data, which uses
different specimen sizes or specimen preparation methods, may not be consistent.
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 62 Plastics - Determination of water absorption
ISO 75-2 Plastics - Determination of temperature of deflection under load - Part 2:
Plastics and ebonite
ISO 178 Plastics - Determination of flexural properties
IEC 60296 Fluids for electrotechnical applications - Unused mineral insulating oils
for transformers and switchgear
IEC 62631-3-1 Dielectric and resistive properties of solid insulating materials - Part
3-1: Determination of resistive properties (DC Methods) - Volume resistance and
volume resistivity - General method
IEC 62631-3-2 Dielectric and resistive properties of solid insulating materials - Part
3-2: Determination of resistive properties (DC methods) - Surface resistance and
surface resistivity
3 Definitions and terms
There are no terms and definitions, that need to be defined, in this document.
ISO and IEC maintain terminology databases for standardization, at the following
websites:
- IEC Electropedia: available at http://www.electropedia.org/
- ISO Online browsing platform: available at https://www.iso.org/obp
4 Preparation of specimen
4.1 Overview
Specimens shall be prepared, using injection molding. Specimens shall be prepared,
using the same process and the same processing conditions. Standard conditions are as
given in Table 1.
Materials shall be kept in moisture-proof containers until processing.
4.2 Pretreatment of materials before molding
Material samples generally do not require pretreatment, prior to processing.
Note: POM molding material particle surfaces can absorb moisture, which may cause surface
defects in molded specimens. In order to ensure that the surface of the specimen is free of
defects, the material can be dried at a temperature of 80 °C, for at least 4 h.
4.3 Injection
Specimens shall be prepared, according to ISO 294-1, ISO 294-3 or ISO 294-4, using
the conditions specified in Table 1.
tracking indices of solid insulating materials (IEC 60112:2009, IDT);
- GB/T 9341-2008 Plastics - Determination of flexural properties (ISO 178:2001,
IDT);
- GB/T 11546.1-2008 Plastics - Determination of creep behavior - Part 1: Tensile
creep (ISO 899-1:2003, IDT);
- GB/T 17037.1-2019 Plastics - Injection moulding of test specimens of
thermoplastic materials - Part 1: General principles, and molding of multipurpose
and bar test specimens (ISO 294-1:2017, MOD);
- GB/T 17037.3-2003 Plastics - Injection moulding of test specimens of
thermoplastic materials - Part 3: Small plates (ISO 294-3:2002, IDT);
- GB/T 17037.4-2003 Plastics - Injection moulding of test specimens of
thermoplastic materials - Part 4: Determination of moulding shrinkage (ISO 294-
4:2001, IDT);
- GB/T 19466.3-2004 Plastics - Differential scanning calorimetry (DSC) - Part 3:
Determination of temperature and enthalpy of melting and crystallization (ISO
11357-3:1999, IDT);
- GB/T 19467.1-2004 Plastics - Acquisition and presentation of comparable single-
point data - Part 1: Moulding materials (ISO 10350-1:1998, MOD);
- GB/T 31838.2-2019 Dielectric and resistive properties of solid insulating materials
- Part 2: Determination of resistive properties (DC Methods) - Volume resistance
and volume resistivity - General method (IEC 62631-3-1:2016, IDT);
- GB/T 31838.3-2019 Dielectric and resistive properties of solid insulating materials
- Part 3: Determination of resistive properties (DC methods) - Surface resistance
and surface resistivity (IEC 62631-3-2:2015, IDT);
- GB/T 36800.2-2018 Plastics - Thermomechanical analysis (TMA) - Part 2:
Determination of coefficient of linear thermal expansion and glass transition
temperature (ISO 11359-2:1999, IDT);
- GB/T 37426-2019 Plastics - Test specimens (ISO 20753:2018, MOD).
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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