GB/T 2577-2005 PDF English
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Test method for resin content of glass fiber reinforced plastics
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| GB/T 2577-1989 | English | 199 |
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Test method for resin content of glass fiber reinforced plastics
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GB/T 2577-2005: PDF in English (GBT 2577-2005) GB/T 2577-2005
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 83.120
Q 23
Replacing GB/T 2577-1989
Test method for resin content of
glass fiber reinforced plastics
(ISO 1172.1996, Textile-glass-reinforced plastics - Prepregs, moulding
compounds and laminates - Determination of the textile-glass and mineral-filler
- Calcination methods, MOD)
ISSUED ON. MAY 18, 2005
IMPLEMENTED ON. DECEMBER 1, 2005
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Method and principle ... 4
4 Sampling ... 5
5 Apparatus ... 6
6 Reagents ... 6
7 Test procedure ... 6
8 Calculation... 7
9 Expression of results ... 7
10 Test report ... 7
Annex A (Normative) Volume content of glass fiber reinforced plastics .. 9
Annex B (Normative) Method to determine the content of fiber in glass
fiber reinforced plastics containing mineral filler ... 10
Annex C ... 12
Foreword
This Standard modifies-adopts ISO 1172.1996 “Textile-glass-reinforced plastics -
Prepregs, moulding compounds and laminates - Determination of the textile-glass and
mineral-filler - Calcination methods”. Annex C describes the standard numbers in this
Standard and the corresponding standard numbers in ISO 1172.1996.
The distinctions between this Standard and ISO 1172.1996 are as follows.
— This Standard specifies the dimensions of the specimen;
— This Standard does not contain the contents concerning the separation of mineral
fillers which are not dissolved in hydrochloric acid.
This Standard replaces GB/T 2577-1989 “Test method for resin content of glass fiber
reinforced plastics”.
This Standard, compared with GB/T 2577-1989, has the following changes.
— Add the section “Principle” (see section 3);
— Add the method to convert the volume content of fiber (see annex A);
— Add the method to separate mineral filler (see annex B).
Annex A and B in this Standard are normative; annex C is for information only.
This Standard was proposed by China Building Material Federation.
This Standard shall be under the jurisdiction of National Technical Committee on Fiber
Reinforced Plastic of Standardization Administration of China.
This Standard is responsibly drafted by Harbin Fiber Glass Research Institute.
Main drafters of this Standard. GUO Shuqi, ZHENG Yan, HOU Diyang, SHI Jianjun,
WANG Rongqiu and WANG Hui.
This first edition of this Standard was issued in 1981 and revised in 1989. This is the
second revised edition.
Test method for resin content of
glass fiber reinforced plastics
1 Scope
This Standard specifies the specimens, apparatus, reagents, test procedure and test
report concerning the determination of resin content in glass fiber reinforced plastics after
calcination.
This Standard is applicable to glass fiber reinforced plastics of which resin matrix can be
fully combusted.
This Standard is applicable to reinforced plastics containing mineral filler which is
dissolved at low combustion temperature or not dissolved in hydrochloric acid.
2 Normative references
The following normative documents contain the provisions which, through reference in this
text, constitute the provisions of this Standard. For dated references, the subsequent
amendments or revisions of these publications do not apply. However, the parties who
reach an agreement based on this Standard are encouraged to investigate the possibility
of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative reference referred to applies.
GB/T 1446 Fiber-reinforced plastics composites – The generals for determination of
properties
3 Method and principle
A test specimen is weighed and subsequently calcinated at a specified temperature. The
specimen is then reweighed. The mass difference before and after calcination is the resin
content, in one of the following ways.
a) In the case of materials containing no fillers, the glass content is calculated directly
from the difference in mass;
b) In the case of materials containing both glass and filler, the glass and filler remaining
after calcination are separated by dissolution of the filler in hydrochloric acid. The
difference BETWEEN the mass of the specimen before calcination AND the mass
of the dried specimen after reaction with acid IS USED to measure the glass content.
7.7 Repeat the operations of calcination, reaching constant temperature, cooling and
weighing until the difference of the results of two successive measurements not exceeding
1mg.
8 Calculation
8.1 Calculate resin content in accordance with formula (1).
Where,
Mt — the content of resin, in %;
m2 — the mass of crucible plus specimen, in milligrams (mg);
m3 — the mass of crucible plus residue after calcination, in milligrams (mg);
m1 — the mass of crucible, in milligrams (mg).
Note. the resin content in the formula above contains impregnating compound reinforcing material and a
slight amount of low molecule substance which can be combusted; if necessary, do blank test for
calibration.
8.2 If reinforced plastics exclude mineral filler, the calculation of volume content of fiber is
shown in annex A.
8.3 If reinforced plastics contain mineral filler, calculate the volume content of fiber which
has been separated in accordance with the method given in annex B.
9 Expression of results
The average of each set of specimens which retains three effective numbers is expressed
as the result of the test.
10 Test report
The test report shall include the following contents in part or fully.
a) The number of this Standard;
b) The test conditions, items and description.
c) The category and source of test use materials;
Annex B
(Normative)
Method to determine the content of fiber in glass fiber reinforced plastics
containing mineral filler
B.1 Calcination of specimen
The specimen shall be calcinated in accordance with the method as stipulated in section
6.
B.2 Separation of mineral filler
B.2.1 Add hydrochloric acid in 250mL beaker in the quantity that 15mL of hydrochloric
acid is added per gram of residue after calcination.
B.2.2 Use glass rod to transfer the residue in the crucible into the beaker containing
hydrochloric acid; stir until the residue fully reacts with the acid (attention shall be drawn to
bubbles generated from the reaction of acid and carbonate splashing out of beaker).
B.2.3 When bubbles disappear, add distilled water in the crucible to reach 3/4 of volume of
crucible which is poured into 250mL beaker. Wash the crucible over and over again until
the residue in it is poured into the beaker.
B.2.4 Add 50 mL of distilled water in the beaker.
B.2.5 Install the filter which has been dried to constant weight on the filtering flask for
suction and filtration.
B.2.6 Slowly pour glass fiber and acid in the beaker into the filter. Wash with the distilled
water over and over again until the solution is neutral; then wash with the denatured
alcohol for twice or three times.
B.2.7 Weigh the filler in the drying oven until the constant weight is reached, graduated to
0.1mg.
B.3 Calculation
B.3.1 Calculate fiber content.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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