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ASTM D202-23
Standard Test Methods for Sampling and Testing Untreated Paper Used for Electrical Insulation
NORMA vydaná dňa 1.5.2023
Informácie o norme:
Označenie normy: ASTM D202-23
Dátum vydania normy: 1.5.2023
Kód tovaru: NS-1143943
Počet strán: 35
Približná hmotnosť: 105 g (0.23 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D202-23 :
Keywords:
absorption, acidity, air resistance, alkalinity, aqueous extract conductivity, aqeous extract pH, ash content, basis weight, board, bursting strength, chloride content, conditioning, conducting paths, density, dielectric strength, dimensions, dissipation factor, edge-tearing resistance, fiber analysis, folding endurance, grammage, heat stability, impregnation time, internal-tearing resistance, moisture content, paper, paperboard, particulate copper, particulate iron, permittivity, pH
Doplňujúce informácie
| Significance and Use | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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8.1?In the buyer-seller relationship it is necessary that an understanding exists as to the expected nominal characteristics of the product, and the magnitude of permissible departure from the nominal values. Also, it is necessary that an agreement be reached as to how many units of a lot can fall outside of the specification limits without rejection of the lot. It is this latter subject that is addressed by this test method. |
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| 1. Scope | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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1.1?These test methods cover procedures for sampling and testing untreated paper to be used as an electrical insulator or as a constituent of a composite material used for electrical insulating purposes. 1.1.1?Untreated papers are thin, fibrous sheets normally laid down from a water suspension of pulped fibers (usually cellulosic) with or without various amounts of nonfibrous ingredients, and which are calendared, if required, to obtain desired thickness and density. Nevertheless, these test methods are applicable, generally although not invariably, to papers formed by other means, to papers modified (during or after formation) by additions, and to papers given subsequent mechanical treatments such as creping. 1.1.2?As an electrical insulating and dielectric material, paper is considered untreated until it is subjected to a manufacturing process such as drying, impregnation, or varnish treatment. 1.1.3?The test methods given herein were developed specifically for papers having a thickness of 0.75 mm (0.030 in.) or less. A number of these test methods are also suitable for use on other materials such as pulps or boards. Refer to Test Methods D3376 or D3394 to determine which tests are applicable to pulps or electrical insulating boards. In the paper industry, some products in thicknesses of less than 0.75 mm are termed paperboard. Such products are included within the scope of these methods. 1.1.4?These test methods are applicable to flexible fibrous-mat materials formed from suspensions of fiber in fluids other than water. Thicknesses of these mats approach 2 mm, and the fibers contained are possibly natural, synthetic, organic, or inorganic; fillers that are natural, synthetic, organic, or inorganic; and flexible polymeric binder materials. 1.2?The procedures appear in the following sections:
1.3?The tests for Holes and Felt Hair Inclusions and the Stain Test for Fine Pores, have been removed from this compilation of test methods. These test methods were specific to grades of capacitor paper formerly covered by Specification D1930, which has been withdrawn. Note 1:?This compilation of test methods is closely related to
IEC Publication 60554-2. Not all of the individual methods included
herein are included in IEC 60554-2, nor are all of the methods in
IEC 60554-2 included in this standard. The individual procedures as
described in the two standards are in general sufficiently close to
each other that it is reasonable to expect that test results
obtained by most of the procedures specified in either standard
will not differ significantly. However, before assuming that a
procedure in these test methods is exactly equivalent to an IEC
60554-2 procedure, the written procedures must be compared closely,
and if it seems advisable, test results by the two procedures are
compared.
1.4?The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5?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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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