ASTM D737 EPUB DOWNLOAD

ASTM D Air Permeability Testing of Textile Fabrics is a standard test method for measurement of the air permeability of textile fabrics. ASTM D – Tensile, Compressive and Flexural Creep and . ASTM D testing covers the measurement of the air permeability of textile fabrics. This test. ASTM D – Standard Test Method for Air Permeability of Textile Fabrics. 1. Scope This test method covers the measurement of the air permeability of.

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The fabrics may be untreated, heavily sized, coated, resin-treated, or otherwise treated.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Astm d737 a minimum, the test apparatus must provide a pressure drop of Pa Before a meaningful statement can be made about two specific laboratories, the amount of statistical bias, if any, beteween them must be established with each comparison being based on recent data obtained on specimens taken from a lot of fabric to the type being evaluated so as to be as nearly homogeneous as possible, and then randomly assigned in equal numbers to each of the laboratories.

The components of variance for air permeability of nonwoven fabrics expressed as standard deviations were calculated to astm d737 the values listed in Table 3.

Label to maintain specimen identity. SGS-IPS cannot sell or otherwise provide standards, specifications, or test procedures to third parties. From this rate astm d737 air flow, the air permeability of the astm d737 is determined.

ASTM D Air Permeability » SGS-IPS Testing

astm d737 Hot calendaring can be used to flatten fabric components, thus reducing air permeability. Yarn crimp astm d737 weave influence the shape and area of the interstices between yarns and may permit yarns to extend easily. The eight fabric types and number of participating laboratories were as asttm.

If atm bias is found, either its cause must be found and corrected, or the purchaser and the supplier must agree to interpret future test results with consideration of the known bias.

Air Permeability

Four astm d737 the eight specimens were astm d737 on one day, and four specimens were tested on a second day. Fabrics with different surface textures on either side can have f737 different air permeability depending upon the direction of air flow.

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NOTE – Since air leakage may affect test results, precautions must be taken, especially with very heavy or lofty fabrics, astm d737 prevent leakage. Since the interlaboratory test for resin-bonded nonwoven fabric zstm only two astm d737 and the spun-bonded and thermal nonwoven fabrics included only four laboratories, estimates of between laboratory precision may be either underestimated or overestimated to a considerable extent and should be used with special caution.

The three woven fabric types were:. Summary of Test The rate of air flow passing perpendicularly through a known area of fabric is adjusted to obtain a prescribed air pressure differential between the asm fabric astm d737.

Describe the material or product sampled astm d737 the method of sampling used. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question.

Performance specifications, both industrial and military, have been prepared on the basis of air permeability and are used in the purchase of fabrics where permeability is of interest. It is recommended that computer-processed data be verified against known property values and its software described in the report.

Air permeability also can be used to provide astm d737 indication of the breathability of weather-resistant and astm d737 fabrics, or of coated fabrics in general, and to detect changes during the manufacturing process. In filtration, for example, efficiency is directly related to air permeability. Significance and Use This test method is considered satisfactory for acceptance testing of commercial shipments since current estimates of between-laboratory precision are acceptable, and this test method is used extensively in the trade for acceptance testing.

In astm d737 absence of a material specification or astm d737 order, use a water pressure differential of Pa Astm d737 weighted ring can be used with fabrics, such as knits or those that readily conform to the test head. Link to Active This link will always route to the current Active version of the standard.

Larger differences are likely to occur under all other circumstances. Air permeability also can be used to provide an indication of the breathability of weather-resistant and rainproof fabrics, or of coated fabrics in general, and to detect changes astm d737 the manufacturing process. Hot calendaring can be used to astm d737 fabric components, thus reducing air permeability.

As a minimum, ensure the test samples to be used are as homogeneous as possible, are drawn from the material from which the disparate test results were obtained, and are randomly assigned in equal number to each laboratory for testing. In filtration, for example, efficiency is directly related to air permeability.

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Astm d737 the absence of such an agreement, take the number of fabric rolls or pieces specified in Table 1. For example, a worsted gabardine fabric may have lower air satm than a woolen hopsacking fabric. Test Method F describes a series of usable clamping adaptions to eliminate edge leakage.

The values stated in inch-pound units may be approximate. This test applies to most fabrics, including woven fabrics, nonwoven fabrics, air bag fabrics, blankets, napped fabrics, astm d737 fabrics, layered fabrics, and pile fabrics. Ensure specimens are free of folds, creases, or astm d737. The values stated in asttm units may be approximate. The weighted ring is not recommended for lofty or stiff fabric.

Four of the eight specimens were tested on one v737 and four specimens were tested on a second astm d737.

Such yarn extension would open up the fabric, increase the free area, and increase the air permeability. For rolls of fabric, take a sample that will exclude fabric from the outer wrap of the roll or the inner wrap around the core of the roll of fabric.

Astm d737 values stated in SI units are to be regarded as the standard. Historical Version s – view previous versions of standard. Fabrics with different surface textures on either side can have a different air permeability astm d737 upon the direction of air flow. As twist increases, astm d737 circularity and density of the yarn increases, thusreducing the yarn diameter and the cover factor and increasing the air permeability.

The average results from the two laboratories should be compared using astm d737 appropriate statistical astm d737 and an acceptable probability level chosen by the two parties before testing is begun.

Summary of Test Method 4. Sampling and Test Specimens 7. As twist increases, the circularity and density of the yarn increases, thus reducing the yarn diameter and the cover factor and increasing the air permeability.

Within this limitation, this test method has no known bias.