ASTM D751 PDF

ASTM D specifies a testing machine with three main parts: Straining mechanism Clamps for holding specimens Load and elongation recording mechanisms. ADMET universal testing machines include the straining mechanism item 1 and built in load and elongation recording mechanisms Item 3. Elongation Test is done at the same time as the breaking strength test so grips are the same. Bursting Strength This fixture holds a piece of fabric securely on the top and bottom surface an exposed a circular area of fabric.

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ASTM D features multiple mechanical properties tests for coated fabrics such as tarps, outdoor clothing, and rain wear. Tests include breaking strength by Procedure A: Grab Test and Procedure B: Cut Strip Test, Elongation, Burst strength, puncture resistance, tear strength tongue tear , trapezoidal tear, Adhesion coating to fabric, tack tear resistance, seam strength, dead load seam strength, and crush resistance.

Our test engineers are experienced with testing to ASTM D and can help guide you through the testing process. We recommend that you purchase the official ASTM standard to achieve the best results.

Preparing the Specimens Gather two sets of 5 specimens each for longitudinal and transverse breaking strength. Procedure A: mm wide X mm long cut from coated fabric Procedure B: 25 mm wide X mm long cut from coated fabric Test Procedure First, place the specimen symmetrically in the fixture clamps with the longer dimension parallel to the direction of the applied force. This test should be performed at the same time as breaking strength with the same specimens.

Preparing the Specimens Use the same specimens as for breaking strength. Procedure A is the preferred method to test, but Procedure B is also acceptable. Start the elongation test at any stated force when the breaking strength is determined. This will be recorded by the UTM controller. This test is characterized by a spherical plunger fixture.

Preparing the Specimens Ten specimens should be cut with the smallest dimension at least Test Procedure First, mount the test specimen in the ring clamp. Record the force maximum force as the bursting strength of the specimen. D Puncture Resistance This test determines the puncture resistance of the coated fabric. This test is different than the bursting strength test in that you operate the test machine at a faster rate and use a sharp plunger shaped fixture to puncture the fabric.

Preparing the Specimens Five specimens should be cut with the smallest dimension at least Test Procedure First you should mount the test specimen in the ring clamp. The Pendulum Test Method requires the specimen to be held between two clamps, one movable and one stationary.

The specimen is then torn by the fall of a pendulum through the force of gravity. The other method, the Tongue Tear Method is more common and requires a universal testing machine. Preparing the Specimens for the Tongue Tear Method Five specimens from each of the warp and filling directions should be tested. Specimens should be rectangular in shape and 75mm X mm in size. Make a 75 mm cut at the center of and perpendicular to a short side of the specimen to form the tongues.

Test Procedure First center the specimen in the machine with one tongue fastened in each clamp Start the machine with a uniform speed of. D Adhesion of Coating to Fabric This test determines the adhesion of coating of the coated fabric. Preparing the Specimens The adhesion of coating to fabric test in ASTM D requires two sets of two specimens each for the longitudinal and transverse direction.

Your specimens should be rectangular and sized as 25mm W X mm L. After creating the specimens, separate the coating from the backing for a distance of 50 mm. Testing Procedure First clamp the separated portions of your sample in the jaws so that movement of the test machine will separate the coating from the backing.

Next run the test machine so that it separates the coating from the backing with a uniform speed of. Record the force necessary to separate the coating from the backing.

Adhesion of coating shall be the average of the 5 highest peak loads during the test. D Tack-Tear Resistance This test determines the tack-tear resistance of the coated fabric. Preparing the Specimens Create two sets of five specimens each for warp and filling tack-tear strength. The specimens should be rectangles and 50mm W X mm L in size.

Testing Procedure Clamp the specialized fixture device in the upper clamp of the test machine and adjust the machine to compensate for its weight.

Next impinge the specimen on the needles. Clamp the specimen in the lower clamp. Finally record the average force necessary to tear the fabric Accessories Required for Tack-Tear Resistance You will need a specialized tack-tear resistance fixture shown in Figure 4 of the standard official standard.

Call our fixture engineers today and they can provide you with a specialized fixture just for this test. D Seam Strength This test is used to determine compare the seam strength with the strength of the coated fabric.

The seam strength test works great for lapped, lapped and bonded, and sewn seams using the modified grab test method.

Specimens should be in rectangle shapes and should be 50mm W X mm L with the seam horizontally across the center. Testing Procedure First place the specimen symmetrically in the jaws of the grips with the seam centered between the jaws.

Record the force necessary for the sample to slip the seam or rupture the fabric. Seam Strength shall be the median of all the individual results. This test is applicable to diaphragm material cut from coated fabrics that will be used for automotive and regulator devices. Preparing the Specimens Three specimens should be tested.

Specimens should be rectangles sized 50 mm wide X mm long. Testing Procedure First you must place the specimen symmetrically on the base plate of your compression tester or universal testing machine. Place the load button on the test specimen with the recessed end down and at least 12 mm from any edge of the specimen.

Apply the force to the button with a uniform speed of. Record the force required to crush or cut the specimen.

If you will be performing the tearing strength test by Pendulum Test Method also called the Elmendorf method , this test requires a special Family Elmendorf Impact Resistance Test Machine. You can pair these universal tester with our XyLive Software needed for adhesion and tear tests in this standard.

XyLive Software allows you to watch the data live as the test runs. Pneumatic actuation allows for quick and simple specimen setup Cuts test specimens from stock material Available for a wide variety of ISO and ASTM standards Consistent specimens for consistent results Manufactured with tool steel to resist damage and wear over time.

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ASTM D751 Coated Fabrics Rainwear Test Equipment

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. Referenced Documents 2.

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ASTM D751 Coated Fabric Tensile Testing

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 Dimensions and Mass: 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.

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