GB/T 33832-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 33832-2017 | English | 140 |
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Determination of Water Resistance of Glass Fiber
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GB/T 33832-2017: Determination of Water Resistance of Glass Fiber---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT33832-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.100.10
Q 36
Determination of Water
Resistance of Glass Fiber
Issued on: MAY 31, 2017
Implemented on: APRIL 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
3. No action is required - Full-copy of this standard will be automatically &
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Specimen Pre-Treatment ... 5
4 Method A. Mass Loss Method ... 5
5 Method B. Monofilament Tensile Breaking Strength Retention Rate
Method ... 8
6 Precision ... 9
7 Test Report ... 10
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard was proposed by China Building Material Federation.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Glass Fiber (SAC/TC 245).
Drafting organizations of this Standard. Nanjing Fiberglass Research & Design
Institute Co., Ltd., Jushi Group Co., Ltd., and China National Fiberglass Product
Quality Supervision & Testing Center.
Chief drafting staffs of this Standard. Zhou Qin, Li Rong, Liao Bing, Wang Yumei, Wang
Tao, Xi Bin, and Wang Ling.
Determination of Water
Resistance of Glass Fiber
Warning. this Standard is not intended to involve all safety issues related to the
use of the product. The users of this Standard are responsible for establishing
appropriate safety and healthy principles; and ensure whether it is applicable to
certain limits of the regulations before use.
1 Scope
This Standard specifies two methods for determination of water resistance of glass
fiber.
--- Method A. mass loss method;
--- Method B. monofilament tensile breaking strength retention rate method. This
method is not applicable to the chopped tows with length less than 3cm.
This Standard is applicable to the determination of water resistance of glass fiber in
tow shape.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 1033.1 Plastics – Methods for Determining the Density of Non-Cellular
Plastics – Part 1. Immersion Method, Liquid Pycnometer Method and Titration
Method
GB/T 6682 Water for Analytical Laboratory use – Specification and Test Methods
GB/T 7690.5 Reinforcements – Test Method for Yarns – Part 5. Determination of
Fiber Diameter for Glass Fiber
GB/T 11415 Laboratory Sintered (Fritted) Filters – Porosity, Grading, Classification
and Designation
GB/T 31290 Carbon Fiber – Determination of the Tensile properties of Single-
Filament Specimens
3 Specimen Pre-Treatment
3.1 For the continuous fiber tow, cut it into 250mm long section; take about 20g; one
end shall be bounded by the fine nylon; then place it into the dryer (diameter of 180mm)
containing 700mL acetone (analytically pure) or other soluble organic solvent of
impregnant; the fiber with free end shall be spread as much as possible; sealing and
soaking for at least 24h till the residual amount of impregnant is no greater than 0.1%.
Take out, use anhydrous ethanol (analytically pure) to wash for 3 ~ 4 times; and stroke
the fiber sot that it becomes neat yarn bundle. Cut 100mm long section fiber from the
free end, place into 105°C±2°C constant temperature drying oven to dry to the constant
weight; take out; place into the dryer (with silicone) to cool off to the room temperature
for backup.
3.2 Take 10g of chopped tow; place into the dryer (diameter of 180mm) containing
700mL acetone (analytically pure) or other soluble organic solvent of impregnant;
sealing and soaking for at least 24h till the residual amount of impregnant is no greater
than 0.1%. Take out, use anhydrous ethanol (analytically pure) to wash for 3 ~ 4 times;
place into 105°C±2°C constant temperature drying oven to dry to the constant weight;
take out; place into the dryer (with silicone) to cool off to the room temperature for
backup.
3.3 When it is required to determine the water resistance of fiber glass containing
impregnant, acetone or other organic solvent is unnecessary to be used to soak;
directly dry it for backup.
4 Method A. Mass Loss Method
4.1 Method summary
Weigh a certain mass of specimen; place into the flowing and boiling water; after a
certain period of time, use the sintered filter to filter, wash, dry, and weigh; calculate
the mass loss rate or mass loss amount per unit surface area.
4.2 Instruments and materials
4.2.1 Steel ruler, accurate to 0.5mm.
4.2.2 Analytical balance, accurate to 0.001g.
4.2.3 Sintered filter, 100mL, shall meet the requirements of GB/T 11415; the glass
material and ceramic filtering disk are suitable. Its aperture shall be less than the
diameter of glass fiber. It shall be treated according to the use instructions before the
5.2.3 Constant temperature drying oven, the temperature shall be controlled at
105°C±2°C.
5.2.4 Tensile tester shall conform to the provisions of GB/T 31290.
5.3 Test procedures
5.3.1 Take no less than 100 pieces of backup fiber samples; place into beaker (5.2.1);
add 600mL of boiled water; place onto the adjustable electric furnace; perform the
hydrolyzed reaction as per 4.4.2; take off; use ice-water bath to cool off.
5.3.2 Use water to wash for 3 times ~ 4 times; place the specimen into 105°C±2°C
constant temperature drying oven (5.2.3) to dry; take off; place into dryer to cool off.
5.3.3 Measure the monofilament tensile breaking strength before and after the
hydrolyzed treatment as per the provisions of GB/T 31290; separately obtain no less
than 25 pieces of valid data.
5.4 Result calculation
It shall be calculated as per Formula (3).
Where.
δ – monofilament tensile strength retention rate, in %;
F2 – average monofilament tensile breaking strength of treated specimen, in cN;
F1 – average monofilament tensile breaking strength of backup specimen, in cN;
The result shall be retained 1 digit after the decimal point.
6 Precision
The repeatability limit of mass loss method can refer to Table 1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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