GB/T 9914.2-2013 English PDF (GBT9914.2-2013)

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GB/T 9914.2-2013: Test method for reinforcement products -- Part 2: Determination of combustible-matter content for glass fibre
GB/T 9914.2-2013
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.100.10
Q 36
Replacing GB/T 9914.2-2001
Test method for reinforcement products - Part 2:
Determination of combustible-matter content for glass fiber
(ISO 1887:1995, Textile glass - Determination of combustible-matter content,
MOD)
ISSUED ON: NOVEMBER 27, 2013
IMPLEMENTED ON: AUGUST 01, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
National Standardization Administration.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Terms and definitions ... 5
3 Principle ... 5
4 Instruments ... 5
5 Specimens ... 6
6 Operation ... 8
7 Result expression ... 9
8 Precision ... 10
9 Test report ... 10
Test method for reinforcement products - Part 2:
Determination of combustible-matter content for glass fiber
1 Scope
This Part of GB/T 9914 specifies the method for determining the combustible-matter
content of glass fiber products.
This method is applicable to continuous fiber yarn, fixed-length fiber yarn, untwisted
roving, chopped strands, milled fiber, fabric, chopped strand mat, continuous strand mat
and other forms of reinforcement products.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1
Combustible-matter content
The ratio of the loss on ignition of dry glass fiber products to the mass of dry
products.
Note: The ratio is expressed as a percentage. When the sizing agent or treatment agent on
the glass fiber product is completely burned without residue (i.e., the original organic
matter), this value is equal to the content of the sizing agent or treatment agent.
3 Principle
Under specified conditions, place the dry specimen at a temperature of (625 ± 20) °C
and burn it. Weigh the mass of the specimen before and after burning. For glass that is
unstable at this temperature, a temperature of 500 °C ~ 600 °C can be selected, which
shall be constant within the range of ±20 °C of the selected temperature.
4 Instruments
4.1 Ventilated oven: The temperature can be controlled at (105 ± 3) °C or the selected
temperature ±3 °C (see 6.3).
4.2 Muffle furnace: The temperature can be controlled at (625 ± 20) °C or the selected
The mass of each specimen shall be not less than 5 g, preferably within 15 g ~ 30 g.
5.1.4 Fabric
The mass of each specimen shall be not less than 5 g.
Cut a specimen with an area of 100 cm2. If the specimen mass is less than 5 g, a larger
specimen shall be cut or several adjacent specimens with an area of 100 cm2 shall be
taken.
The specimen size can be the same as the specimen for measuring the mass per unit
area.
The woven fabric specimen shall be cut at least 10 mm away from the edge of the cloth
or the selvedge. If the specimen must be folded, it shall not hinder the flow of air over
the entire specimen surface. It is recommended to use a template (4.7) and a shearing
tool or a punching device (4.8) to cut the specimen to avoid material loss.
5.1.5 Felt
The mass of the specimen shall be at least 5 g. The recommended specimen is a 316
mm × 316 mm square (0.1 m2); other specimens with a surface area close to 0.1 m2 may
also be used. If other specimen shapes are used, the following specimen preparation
process shall be modified appropriately.
If more than one squares must be used to achieve the minimum specimen mass, the
square specimens shall be cut along the same straight line along the length of the felt
roll.
Cut a felt strip at least 316 mm long across the width of the felt and cut the specimens
from the felt strip using a template (4.7) and a cutting tool (4.8):
a) Cut a 316 mm × 316 mm specimen at each end of the felt strip (for felt strips
with trimmed edges, at least 10 mm from the edge).
b) Cut as many 316 mm × 316 mm specimens as possible between the specimens
at the two ends (these specimens shall be evenly distributed).
5.2 Number of specimens
Unless the product specification or the test client has different or more detailed
instructions (i.e., quantity and location), the number of specimens per unit product shall
be as specified in Table 2.
Note: The number of specimens for the determination of combustible-matter content may vary
depending on the form of the unit product. In addition, the test may be repeated at one or more
locations depending on the mass (chopped strands, milled fibers) or length (fabric, felt) of the
unit product being tested. Additional information on the number of specimens and the sampling
Heat the specimen for at least 30 minutes.
Take the specimen dish and the specimen out of the oven and place them in a desiccator
(4.3) to cool for 30 minutes.
Weigh the total mass of the specimen dish and the dried specimen; record it as m1,
accurate to 0.1 mg.
Repeat heating, cooling, weighing, until the mass is constant (see Note 3).
6.4 Weigh the mass of the specimen and the specimen dish after burning
Place the specimen dish and the dried specimen in a muffle furnace (4.2); control the
furnace temperature at (625 ± 20) °C or any selected temperature within 500 °C ~
600 °C (see 6.2).
Open the furnace door; let the specimen burn for 5 minutes (see Notes 1 and 2). Then
close the furnace door and burn for another 30 minutes. If the selected temperature is
lower than 625 °C, the burning time after closing the furnace door shall be increased to
at least 1 hour.
Move the specimen and the specimen dish from the muffle furnace into a desiccator
(4.3); cool to room temperature.
Weigh the total mass of the specimen dish and the specimen after burning; record it as
m2, accurate to 0.1 mg.
Repeat heating, cooling, weighing, until the mass is constant (see Note 3).
Note 1: Open the furnace door to allow volatiles to escape from the furnace, to prevent
condensation from depositing on the specimen or specimen dish.
Note 2: If a ventilated muffle furnace is used, the furnace door does not need to be opened.
Note 3: This method requires that all weighing shall be repeated for drying and burning to
ensure constant mass. If the material is tested frequently, the shortest time for the drying and
burning stages can be determined experimentally to ensure constant mass.
7 Result expression
Calculate the combustible-matter content of the specimen according to formula (1),
expressed as the mass fraction of the dry product:
Where: