Wicking tests

Some of the tests and criterion used to define fire resistance may be found in the Hterature (9). Additionally, the compression—ignition and hot manifold tests as defined in MIL-H-19457 and MIL-H-5606, respectively the Wick test as defined by Federal Standards 791, Method 352 flash point and fire point as defined in ASTM D92 autoignition temperature as defined in ASTM D2155 and linear flame propagation rate are defined in ASTM D5306 are used. 

Spot test Wicking test 5 min 10 min 1 cm Wicking rate 2 cm 3 cm... 

A wicking test is used to determine the absorptive velocity of water in fabrics. It is known as the capillary rise test (DIN EN 53924). With respect to time, the capillary rise of absorptive fabrics in the warp and weft directions is measured by dipping them in distilled water. The absorptive velocity depends on the capillary force, which determines the transport of liquid contrary to gravity. For fabric the wicking velocity, the path of liquid distribution and the final wet figure can be different in the warp and weft directions. 

Karahan and Ozdogan (2008) used air plasma and an argon atmospheric plasma for enhancing the hydrophobicity of cotton. A DBD system and a sample of plain-weave cotton fabric were used. The samples were plasma-treated at a range of powers (50,100 and 130 W) and for different exposure timescales (20,40 and 60 s). The wettability of the samples was investigated via absorbency values, contact angles, wicking tests and X-ray photoelectron spectroscopy (XPS). 

Changes in the water transport rate of treated PET fabrics have been measured by a vertical wicking test in which the rising height of water in a strip of fabric is determined [3, 33, 77], Measurements of the dissipation of a drop of water on fabric [ 11, 38,62], liquid retention capacity (the ratio of the amount of liquid to the dry fabric quantity), and moisture regain (the amount of water a dry fiber absorbs from the air at a defined relative humidity) [43, 44, 51, 60] also aim to determine changes in the water absorption behavior of treated PET fabrics. Incomplete removal of enzymes adsorbed to the PET surface can, however, easily lead to incorrect results obtained using these methods [11, 23, 102]. 

FIGURE 4.16 Experimental Setup for Wicking Tests. Shown in the picture is the 30 x 150 screen. 

Static wick test results on a wickproof steel cord reinforced neoprene rubber fabric for sonar dome rubber windows (SDRWs) on US navy vessels are presented. A dynamic water wicking test was developed to model actual operating conditions of the SDRWs. All fabric samples believed to be wickproof failed this test. The effects of mechanical flexure on other mechanical properties of steel reinforced rubber fabric are discussed. 11 refs. 

Alloy NaCi Wick Test 100C(212F) Aerated 26%NaCI Autoclave Tests ln26%NaCI ... 

Figure 10.16. Comparison of maximum wicking height obtained from the vertical wicking test and the theoretical model [Source Reference 63].

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