GB/T 2577-2005Test method for resin content of glass fiber reinforced plastics (English PDF)

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.

8 Calculation

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.

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