ASTM D1248 PDF

More D The polyethylene plastics are identified primarily on the basis of two characteristics, namely, density and flow rate previously identified as melt index. Other attributes important for certain applications are covered by three general classes and by specifying in greater detail, by grades, a minimum number of key characteristics covered too broadly or not at all by the type, class, and category designations. The extrusion material for wire and cable shall be polyethylene plastic in the form of powder, granules, or pellets. The extrusion materials for wire and cable shall be as uniform in composition and size and as free of contamination as can be achieved by good manufacturing practice. Different tests shall be conducted in order to determine the following physical properties of extrusion materials: tensile stress, elongation, brittleness temperature, environmental stress-crack resistance, thermal stress-crack resistance without cracking, dissipation factor before and after milling, dielectric constant, volume resistivity, water immersion stability, absorption coefficient, weatherability for colored materials, and carbon content.

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Mogore However, no information is available on the relation between exposure times and service life under use conditions for wire and cable. The extrusion materials for wire and cable shall be as uniform in composition and size and as free of contamination as can be achieved by good manufacturing practice. For information regarding plastic pipe materials, see Specification D Test results for specimens that break outside the gage-marks after extensive cold drawing need not be discarded unless the break occurs between the contact surfaces of a grip.

Force range of 5 kN to kN 1, lbf tolbf Adjustable test space The most popular choice for static tension and compression tests These dual column testers are available in both tabletop and floor standing models. Retest and Rejection In all cases the laboratory shall report both the temperature and humidity conditions during the conditioning period.

G Dissipation factor and dielectric constant must not exceed the limits speci? Test specimens over 7 mm in thickness shall be conditioned for 88 h. This abstract is a brief summary of the referenced standard. A number in parentheses indicates the year of last reapproval.

Different tests shall be conducted in order to determine the following physical properties of extrusion materials: Selection of acceptable quality level AQL and of inspection level IL shall be made, with consideration of the speci? Basis of Purchase 5. Prepare the specimens in accordance with Test Methods D for physical tests of insulations and jackets. Agreement of the parties involved may allow use of this device.

Active view current version of standard. ASTM D Polyethylene Plastics Extrusion for Wire and Cable Test Equipment However, the degradation rate of polyethylene has been found to be more variable than in the irradiance controlled unit and may be as little as 1? The letters associated with these grades identify areas of potential applicability as v below: For information regarding plastic pipe materials, see Specification D It is the responsibility of the user of aetm standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

However, because this test is lengthy, it need not be performed on every lot of material. ASTM D Polyethylene Plastics Extrusion for Wire and Cable Test Equipment Other attributes important to the user for certain applications are covered by three general classes and by specifying in greater detail, by grades, a minimum number of key characteristics covered too broadly or not at all by the type, class, and category designations. Give our test engineers a call today for help configuring the best test machine and accessories d to your standard.

NOTE 16—The irradiance level in the unit axtm does not have irradiance control is reported to be 0. Perform the tests in accordance with Practices DG and G using? Category 1,Category 2, Category 3,Category 4, and Category 5. Therefore, this type of unit is not recommended as a laboratory accelerated weathering test to qualify materials for outdoor applications.

F Dielectric constant is a function of density; hence, the nominal value will be different for each type. Conditioning ashm test conditions shall be as speci? For all materials to be conditioned for electrical testing, conditioning shall comply with the requirements of the standard test methods for electrical testing. Note 1—There is no known ISO equivalent xstm this standard. Test specimens, 7 mm or under in thickness, shall be conditioned for a minimum of 40 h immediately prior to testing.

Other attributes important for certain applications are covered by three general classes and by specifying in greater detail, by grades, a minimum number of key characteristics covered too broadly or not at all by the type, class, and category designations. The polyethylene plastics are identified primarily on the basis of two characteristics, namely, density and flow rate previously identified as melt index.

ASTM D is a specification for identification of polyethylene plastics extrusion materials for wire and cable. After being milled as prescribed, the material shall meet the dielectric requirements prescribed in Table 3. Any other size two-roll laboratory mill may be used provided the charge is adequate to maintain a uniform rolling bank on the rolls and to furnish sufficient material for test specimens.

The tests involved in this specification are intended to provide information for identifying materials according to the types, classes, categories, and grades covered. J4 19 [] —75 For such materials, the milling procedure described in V tests involved in this speci? March 1, 1 2 3 4 5 Added a new Section E7 17 [] — J3 12 [] —75 For information regarding molding and extrusion materials, see Speci? If you feel that your comments have not received a fair hearing you should make your views d to the ASTM Committee on Standards, at the address shown below.

Work Item s — proposed revisions of this standard. Your comments are invited either for revision of wstm standard or for additional standards and should be addressed to ASTM International Headquarters. This standard has undergone major revision from the reapproval of and now covers only polyethylene for wire and cable applications. Irradiance at the control point shall be maintained at 0.

E3 10 [] — It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. TOP 10 Related.

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ASTM D1248

Mogore However, no information is available on the relation between exposure times and service life under use conditions for wire and cable. The extrusion materials for wire and cable shall be as uniform in composition and size and as free of contamination as can be achieved by good manufacturing practice. For information regarding plastic pipe materials, see Specification D Test results for specimens that break outside the gage-marks after extensive cold drawing need not be discarded unless the break occurs between the contact surfaces of a grip. Force range of 5 kN to kN 1, lbf tolbf Adjustable test space The most popular choice for static tension and compression tests These dual column testers are available in both tabletop and floor standing models.

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ASTM D1248 Polyethylene Plastics Extrusion for Wire and Cable | Test Equipment

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