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ASTM D1693-13

Заменен
Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics — 11 стр.
Значение и использование

5.1 This test method may be used for routine inspection purposes by subjecting a required number of specimens to the test conditions for a specified time and noting the number that fail. The cracking obtained with the test reagent is indicative of what may be expected from a wide variety of surface-active agents, soaps, and organic substances that are not absorbed appreciably by the polymer.

5.2 Environmental stress-cracking is a property that is highly dependent upon the nature and level of the stresses applied and on the thermal history of the specimen (1). Under the conditions of the test method, high local multiaxial stresses are developed through the introduction of a controlled imperfection (2, 3). Environmental stress-cracking has been found to occur most readily under such conditions.

Note 2Different types of polyethylene plastics as defined in Specification D1248 are generally tested under different levels of strain and stress. When it is expressly desired to compare the types at equal levels of strain, the specimens for all types should be tested under Condition B, Table 1 (4) . TABLE 1 Standard Test Conditions

Condition

Specimen Thickness

Notch Depth

Bath Temperature, °C

mmA

in.

mmA

in.

AB

min

3.00

0.120

0.50

0.020

50

 

max

3.30

0.130

0.65

0.025

 

BB

min

1.84

0.0725

0.30

0.012

50

 

max

1.97

0.0775

0.40

0.015

 

CC

min

1.84

0.0725

0.30

0.012

100C

 

max

1.97

0.0775

0.40

0.015

 

A Dimensional values are not exactly equivalent. However, for referee purposes the metric units shall apply. B For referee purposes, concentration of Igepal will be consistent with the appropriate material standard. If no concentration is given, then 10 % volume solution shall be used.C At a temperature of 100°C, a full-strength reagent, rather than an aqueous solution of a reagent, is generally used because solutions tend to change their compositions by water evaporation losses during the period of test.

5.3 Information from this test method is not intended to be used for direct application to engineering problems.

Note 3Caution should be used in comparing and ranking various ethylene plastics into distinct and separate groups by this test method (see Section 13 and Note 12).

As thermal history is recognized as an important variable, test results by this test method employing laboratory molded samples cannot necessarily be expected to show agreement with test results from samples obtained by other means. The true performance potential of a given ethylene plastic may, however, best be determined with specimens obtained from commercially prepared items (5).
Область применения

1.1 This test method covers the determination of the susceptibility of ethylene plastics, as defined in Terminology D883, to environmental stress-cracking when subjected to the conditions herein specified. Under certain conditions of stress and in the presence of environments such as soaps, wetting agents, oils, or detergents, ethylene plastics may exhibit mechanical failure by cracking.

1.2 The values stated in SI units are to be regarded as standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.

Note 1There is no known ISO equivalent to this standard.
ICS
83.080.20 Thermoplastic materials / Термопластические материалы
Сборник ASTM
08.01 Plastics (I): C1147–D3159 / Пластмасса (I): C1147–D3159
Тематика
Plastics