GB/T 14577-1993 PDF English
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Textiles. Determination of water repellency of fabrics by the Bundesmann rain-shower test
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GB/T 14577-1993: PDF in English (GBT 14577-1993) GB/T 14577-93
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
UDC 677.017.6
W 04
Textiles - Determination of water repellency of
fabrics by the Bundesmann rain-shower test
ISSUED ON. AUGUST 29, 1993
IMPLEMENTED ON. MARCH 1, 1994
Issued by. China Bureau of Technical Supervision
3. No action is required - Full-copy of this standard will be automatically &
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Table of Contents
This Standard equivalently adopts the International standard ISO 9865-1991
“Textiles -- Determination of water repellency of fabrics by the Bundesmann
rain-shower test”... 3
1 Thematic content and scope of application .. 3
2 Normative references ... 3
3 Definition ... 3
4 Principle.. 3
5 Equipment and materials ... 3
6 Atmosphere of test and humidity conditioning ... 5
7 Sample preparation ... 5
8 Instrument calibration ... 5
9 Operation procedures ... 5
10 Results expression ... 6
11 Test report .. 8
Additional information ... 9
Textiles - Determination of water repellency of
fabrics by the Bundesmann rain-shower test
This Standard equivalently adopts the International standard ISO 9865-1991
“Textiles -- Determination of water repellency of fabrics by the Bundesmann
rain-shower test”.
1 Thematic content and scope of application
This Standard specifies the determination of water repellency of fabrics by the
Bundesmann rain-shower test.
This Standard applies to evaluate the effect of water repellency finishing
process of the fabrics subjected to the shower under exercise conditions.
2 Normative references
GB 6529, Textiles - Standard atmospheres for conditioning and testing
3 Definition
water repellency
the ability of fabrics to resist rainwater absorption over the specified time under
the designated artificial rain gear; it may be also used to evaluate the amount
of water absorbed through the fabric and outflow through the fabric
4 Principle
Place the sample on the sample cup to make it subjected to man-made rain
under the specified conditions. Then, use reference sample and wet sample for
visual comparison to evaluate the water repellency. Weigh the moisture
absorbed by the sample during the test. Record the amount of water collected
in the sample cup through the sample.
5 Equipment and materials
The aluminum and aluminum alloy substrates shall comply with the provisions
of GB 11333.
5.1 The rain-shower instrument consists of rain-shower utensil, sample loader
and frame.
5.1.1 The rain-shower utensil consists of 300 identical drippers that are evenly
distributed on a plane with a diameter of 406 mm (the area is about 1300 cm2).
The surface diameter of drop formed by each dripper is about 4 mm. About 0.07
mL of the drops of water come from the dripper. The water flow of the rain-
shower equipment is adjustable. The flow can be set before the test. The flow
of per 100 cm2 of the shower surface is 100±5 mL/min. The distance from the
dripper to the sample surface center is 1500 mm. The test water is passed
through a mechanical filter to remove larger impurities. The water temperature
shall be 20±3°C.
5.1.2 The sample loader consists of sample clip, sample cup and wiper. It has
a cup-shaped structure. It can collect and measure the water permeated
through the sample.
5.1.2.1 The sample clip is placed on the upper of the sample loader, which
consists of buckle and sample clamping ring. It can clamp the sample. The
sample clamping ring of thick fabric shall be bigger than that of thin fabric. After
clamping, the exposed surface of sample shall be 80 cm2.
5.1.2.2 The outer diameter of sample cup is 100 mm. The center of the cup is
angled by 15° to the vertical to ensure water flow on the surface of the sample.
Each sample cup has a 7±1 mm diameter vent.
5.1.2.3 Each sample cup is attached with a pair of wipers, in cross shape. The
test scraper shall be close to the lower of the sample. The force value is about
250 cN. It rotates 20 times per minute. The rotation angle is about 100°. The
arm length of the cross-shaped scraper is 48mm; the width is 5 mm. It is made
of stainless steel, with surface polished. It is slightly curved along the length
direction (about 630 mm in radius). The radius of the arc cross-section is about
5 mm.
5.1.2.4 When several samples are to be tested in the same way, 4 sample
loaders shall be uniformly arranged in a ring shape on the same component of
the sample holder. During the rain-shower test, the cup holder is rotated around
the center of the instrument at 6 r/min, so all the samples are subjected to the
same rain-shower conditions.
5.2 The centrifuge consists of a 700 r/min horizontal loading tray.
The loading tray is circular and has a diameter of 175 mm. There are about 50
fine ribs on the surface which are arranged radially. About 1 mm high ribs
around the loading tray are evenly distributed so that the wet sample shall not
cling to the tray.
conditioning, to the nearest of 0.01 g. After identifying the test surface of the
sample, put it on the sample cup without any tension. Use suitable sample
clamping ring to clamp the sample.
Pull the rain board, so that the sample is showered for 10 min.
Use reference sample (see 5.3) for visual evaluation of wet sample’s water
repellency according to the following 5 levels.
Level 5 Small drops of water drip quickly
Level 4 Large drops of water form
Level 3 Some samples are stained with water beads
Level 2 Partial are wetted
Level 1 Entire surface is wetted
It shall evaluate the water repellency after 1 min and 5 min.
Observe the wetting condition of the un-showered surface of the sample.
Centrifuge 15s for sample dehydration, immediately weigh its mass m2, to the
nearest of 0.01 g (if it cannot immediately weigh after dehydration, it shall weigh
in the weighing bottle).
In the rain-shower test, in addition to the determination of the amount of water
absorbed by the sample, it can also measure the water amount penetrated
through the sample. Measure the water collected in the sample cup in milliliters.
10 Results expression
Calculate the water absorption rate, in mass percentage. The equation is as
follow.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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