This standard is issued under the fixed designation D ; the 1 These test methods are under the jurisdiction of ASTM Committee D11 on. ASTM D – Standard Test Method for Coated Fabrics. ASTM D Standard Test Methods for Coated Fabrics.
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The literature recognizes rubber-coated fabrics, however the coverage is not limited to rubber, and extends to similar types of polymer coatings on textiles. Types of coatings that are commonly used include plastic material as well as teflon PTFE.
This allows the material to acquire multiple hybrid properties, such as a textile becoming stronger or more stain or wear resistant. Waterproof textiles are also usually tested to one or more of these standards.
This list explains the grips and equipment needed for each of the 20 different tests under ASTM D The length may be measured by a ruler or with the drum method where the length data is measured off a dial or indicator.
The width can also be measured with a ruler or more accurate device. The weight is measured on atm scale with a smaller piece of the fabric. The test utlizes a tensile testing machine and a pair of vise grips with front grip inserts of 1×1″ and back inserts of 1×2″.
A UTM and vise grips with the same 1×1 and 1×2 inserts are used. The elongation is typically measured by the crosshead of the UTM, however extensometers can be used to acquire direct strain data from the specimen.
Another test using a puncture fixture. This test is similar to ASTM D where a puncture implement with a chamfered edge is used to puncture through the sample.
ASTM D751 Coated Fabrics Rainwear Test Equipment
The vise grip faces must be 1×2″ HxW or more. A tensile tester and vise grips with 2×3″ HxW grip inserts are used. This small benchtop machine forces hydraulic fluid through a diaphragm of the coated fabric under inspection. The coated fabric diaphragm will burst, revealing its hydrostatic resistance. A rising water column tester is a simpler device compared to the Mullens tester.
This type of test is also referred to as a Suter test. Adhesion Coating to Fabrics. The adhesion test is used when the coating is stronger than the adhesive that binds it to the fabric. The vise grip inserts should be 1×3″ HxW. The strength of the coating on the fabric is measured by pretensioning asrm sample and then testing it using one of the above hydrostatic methods. The sample is stretched at a definied load for a set period of time before being hydrostatically tested.
The Tack-Tear test fixture is described in scant detail in the official publication. It involves a fixture that uses a row of needles or nails to grip into the sample.
The apparatus is then pulled apart and tearing occurs along where the needles were gripped into the sample. Low Temperature Bend Test. ASTM D specifies the low temperature bend test. Low Temperature Impact Test. Low Temperature Crack Resistance. Crack resistance is tested at low temperature by means of x751 chilling chamber.
Square samples are put into the chamber for conditioning. Once the samples are cold enough, the samples are folded in half.
A weighted roller is used to roll over the folded sample to push down on the crease. The samples are then unfolded and allowed to reach more normal aastm. The remaining sample is then tested for Hydrostatic Resistance. The idea is to test for any cracks in the coating that may affect its permeability.
ASTM D covers a similar procedure d7551 seam efficiency. Accelerated Heat Aging Oven Method. The oven only cycles heat, the samples should not be exposed to light. After the sample has been heat aged it is tested using one of the above procedures. Dead Load Seam Strength. Dead Load Seam Strength is similar to the seam strength test.
Grips with faces of over 1×1″ are appropriate.
ASTM D Coated Fabrics Rainwear Test Equipment
Blocking Resistance at Elevated Temperatures. Blocking resistance is r751 by folding a piece of fabric sample a couple of times and then placing it in between two glass plates. A weight is placed on top of the glass plates to maintain even pressure. The samples are then conditioned in an oven for a set temperature and time period.
Crush resistance is a compression test similar to a shear test. A piece asfm coated fabric is pushed onto a small circular button. The button has space to puncture through the sample.
This special crush resistance fixture is unique to this test. Wicking of Coated Cloth. Small wick sized samples are put into a beaker with a water soluble dye. The wicks stand in the beaker and the dye traverses up the fabric by means of wicking. After a set period of time the amount of wicking is measure. Vise Grips are the standard solution for this test, however self-tightening wedge or scissor grips may be used as well as long as the grip face sizes are appropriate. There are a few types of grip faces that are r751 including blank, vulcanized rubber, pyramid, or wave.
Textile tests are usually performed in rapid sequences and therefore it may be advantageous to use pneumatic grips, especially if the machine is running for qstm hours per day. The long term increases in productivity and efficiency out-weigh the initial cost. Tests within D include puncture, seam strength, and tear tests. There are a total of 20 procedures listed, with most of them being variations of common fabric tests.
Elongation The elongation is typically measured by the crosshead of the UTM, however extensometers can be used to acquire direct strain data from the specimen. Puncture Resistance Another test using a puncture fixture. Adhesion Ashm to Fabrics The adhesion test is used when the coating is stronger than the adhesive that binds it to the fabric. Strength of Coating The strength of the coating on the fabric is measured by pretensioning the sample and then testing it using one of the above hydrostatic methods.
Tack-Tear Resistance The Tack-Tear test fixture is described in scant detail in the official publication. Low Aatm Crack Resistance Crack resistance is tested at low temperature by means of a chilling chamber. Blocking Resistance at Elevated Temperatures Blocking resistance is tested by folding a dd751 of fabric sample a couple of times and then asrm it in between two astk plates. Crush Resistance Crush resistance is a compression test similar to a shear test. Wicking of Coated Cloth Small wick sized samples are put into a beaker with a water soluble dye.