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ASTM D470 PDF

Split Tear Strength – ASTM D The force per unit thickness required to tear a material. Test specimens are placed in a tensile test machine. The jaws are set. This standard is issued under the fixed designation D ; the number 1 These test methods are under the jurisdiction of ASTM Committee D-9 on. Electrical. ASTM D Standard Test Methods for Crosslinked Insulations and Jackets for Wire and Cable.

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Stretch one length of covering into the clamps of the buffing apparatus so that it lies? Remove the dust for approximately a 0. Precision and Bias No sample shall be selected from lots of less than ft.

Do not heat, immerse in water, or subject the specimens to any mechanical or chemical treatment not speci? Capacitance and Dissipation Factor Tests. Water absorption testing provides useful data for research and development, design engineering, quality control, and acceptance or rejection under speci?

Rate of Voltage Application Click to learn more.

Aetm appropriate means, such as exhaust vents, to reduce ozone concentrations to acceptable levels in working areas. A fresh solution of 1 g of soluble starch in mL of boiling water is another available option. Make an effort to separate the jacket from the insulation by slitting the covering through to the conductor and pulling the jacket and insulation apart by pliers.

Determine all weights to aatm nearest 0. Immersing the sample in hot water for a few minutes just prior to pulling off the jacket often facilitates this procedure. Since this solution gradually c470 its strength, standardize it against the standard iodine solution on the day tests are run. See Table 3 for the mandrel diameters. Measure the voltage with an electrostatic voltmeter or, in the case of the rectifying equipment, with suitable low-voltage indicators, provided the latter are so connected that their indications are independent of the test load.

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The amalgamation is assisted by? Physical Test Procedures NOTE 8—These thicknesses are based on unipass construction. No testing is necessary for manufacturing lots smaller than 10 ft.

ASTM D – 05_百度文库

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Continue the immersion for a period of h. Thermal tests provide useful data for research and development, engineering design, quality control, and acceptance d40 rejection under speci?

The gross length of each specimen shall be 17 ft 5. In extreme cases, use of a segmental specimen is permitted. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

At the end of this 1 h period, place the specimen directly under the foot of the micrometer and allow it to remain in the oven under load for 1 h.

Bend the other specimen similarly but in the reverse direction and plane of the existing curvature. Adjacent turns shall not touch each other but shall be separated about 1? Omit this test for non-shielded conductors astn up to V if the ac voltage test described in This test is not necessary for non-shielded conductors rated up to V if the dc voltage test described in Discard the solution after one week and prepare fresh solution.

Apply a Hz potential to the remaining three electrodes of each specimen. Take insulation resistance readings in accordance with Sections 32 to It also measures the characteristic of the insulation to minimize spread of? Unless otherwise indicated, the intention is that all reagents conform to the speci? Calculate astj area of a stranded conductor from its maximum diameter.

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C470 electrical test values give an indication as to how the insulation will perform under conditions similar to those observed in the tests. Starting with the voltage at which the test v470 in Because of this it is important to measure the concentration of ozone in the atmosphere, using commercially available monitoring devices, whenever the odor of ozone is persistently present or when ozone generating conditions astn. The jacket is buffed off, with due care not to buff any further than necessary, or overheat the material.

Collection of Sample It is also possible to facilitate the removal of the insulation by stretching the conductor to the breaking point in a tensile-strength machine. Water absorption tests, properly interpreted, provide information with astk to the water absorption properties of the insulation.

This test may be used to provide data for research and development, design engineering, quality control, and acceptance or rejection under speci?

ASTM D470 – 13

Nonshielded cables shall be tested in a grounded water bath or in a foil. The separation of the insulation results from the amalgamation of the tin of the conductor with the mercury. For the set test mark the specimens with gage marks 2 in. Therefore, tests are done d47 insulated or jacketed wire or cable in these test methods solely to determine the relevant property of the insulation or jacket and not to test the conductor or completed cable. Take the average of these determinations as the average thickness of the jacket.