GB/T 1634.2-2004 English PDF (GBT1634.2-2004)

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GB/T 1634.2-2004: Plastics -- Determination of temperature of deflection under load -- Part 2: Plastids, ebonite and long-fibre-reinforced composites
GB/T 1634.2-2004
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.01
G 31
GB/T 1634.2-2004 / ISO 75-2.2003
Replacing GB/T 1634-1979
Plastics - Determination of temperature of deflection
under load - Part 2. Plastics, ebonite and long-fiber-
reinforced composites
(ISO 75-2.2003, IDT)
ISSUED ON. MARCH 15, 2004
IMPLEMENTED ON. DECEMBER 1, 2004
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3 
Introduction ... 6 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms and definitions ... 8 
4 Principle... 9 
5 Apparatus ... 9 
6 Test specimens ... 9 
7 Conditioning ... 10 
8 Procedure (flatwise testing) ... 11 
9 Expression of results ... 12 
10 Precision ... 12 
11 Test report ... 12 
Annex A ... 14 
Annex B ... 16 
Bibliography ... 19 
Foreword
GB/T 1634 Plastics - Determination of temperature of deflection under load
consists of the following 3 parts.
- Part 1. General test method;
- Part 2. Plastics, ebonite and long-fiber-reinforced composites;
- Part 3. High-strength thermosetting laminates.
This Part is the second part of GB/T 1634.
This Part is identical with ISO 75-2.2003 Plastics - Determination of
temperature of deflection under load - Part 2. Plastics and ebonite.
This Part is equivalent to translate ISO 75-2.2003; it is identical in technical
content.
For easy of use, this Part makes the following editorial changes.
a) “This International Standard” was modified to be “this Standard” or “GB/T
1634”; “this Part of ISO 75” was modified to be “this Part of GB/T 1634”
or “this Part”;
b) Deleted ISO 75-2.2003’s foreword; modified the introduction of the
international standard;
c) Added national standard’s foreword;
d) Three international standards listed in “Normative references” were
replaced by the corresponding Chinese national standards which
identically adopt the international standards;
e) Used decimal point “.” to replace “,” in the international standard which
was used as decimal point.
The previous version of this Part is GB/T 1634-1979 (confirmed in 1989)
Plastics - Determination of temperature of deflection under load (temperature
of deflection for short). Compared with the previous version, the main technical
changes are as follows.
Plastics - Determination of temperature of deflection
under load - Part 2. Plastics, ebonite and long-fiber-
reinforced composites
1 Scope
This Part of GB/T 1634 specifies three methods, using different values of
constant flexural stress, that can be used for the determination of the
temperature of deflection under load of plastics, ebonite and long-fiber-
reinforced composites.
 method A, using a flexural stress of 1.80 MPa;
 method B, using a flexural stress of 0.45 MPa;
 method C, using a flexural stress of 8.00 MPa.
The standard deflection Δs used to determine the temperature of deflection
under load corresponds to a flexural strain increase Δεf defined in this Part of
GB/T 1634. The initial flexural strain due to the loading of the specimen at room
temperature is neither specified nor measured in this Part of GB/T 1634. The
ratio of this flexural-strain difference to the initial flexural strain depends on the
modulus of elasticity, at room temperature, of the material under test. This
method is therefore only suitable for comparing the temperatures of deflection
of materials with similar room temperature elastic properties.
NOTE. The methods give better reproducibility with amorphous plastics than with semi-
crystalline ones. With some materials, it may be necessary to anneal the test specimens to
obtain reliable results. Annealing procedures, if used, generally result in an increase in the
temperature of deflection under load (see 6.6).
For additional information, see GB/T 1634.1-2004, clause 1.
2 Normative references
The following standards contain the provisions which, through reference in this
Part of GB/T 1634, constitute the provisions of this Part. For dated references,
the subsequent amendments (excluding corrections) or revisions do not apply
to this Part. However, the parties who enter into agreement based on this Part
are encouraged to investigate whether the latest versions of these documents
are applicable. For undated reference documents, the latest versions apply to
this Part.
GB/T 1634.1-2004 Plastics-Determination of temperature of deflection
under load - Part 1.General test method (ISO 75-1.2003, IDT)
GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and
testing (idt ISO 291.1997)
GB/T 17037.1-1997 Plastics - Injection moulding of test specimens of
thermoplastic materials - Part 1. General principles and moulding of
multipurpose and bar test specimens (idt ISO 294-1.1996)
GB/T 293.1986 Plastics - Injection moulding of test specimens of
thermoplastic materials
ISO 1268-4 1) Fibre-reinforced plastics - Methods of producing test plates
- Part 4. Moulding of prepregs
ISO 2818.1994 Plastics - Preparation of test specimens by machining
ISO 3167.2002 Plastics - Multipurpose test specimens
ISO 10724-1.1998 Plastics - Injection moulding of test specimens of
thermosetting powder moulding compounds (PMCs) - Part 1. General
principles and moulding of multipurpose test specimens
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T
1634.1-2004 apply.
NOTE. Depending on the selected value of the flexural stress (see clause 1), the temperature
of deflection under load (see definition 3.7 in GB/T 1634.1-2004) is designated as Tfx 0.45, Tfx
1.8 or Tfx 8.0 (where x = f for flatwise testing; and x = e for edgewise testing).
1 This standard is going to be published.
Bibliography
[1] ISO 10350-1.1998 Plastics - Acquisition and presentation of comparable
single-point data - Part 1. Moulding materials
[2] ASTM E 691 Standard Practice for Conducting an Interlaboratory Study
to Determine the Precision of a Test Method