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Standard Test Method for Viscosity of Cellulose Derivatives by Ball-Drop Method
Automaticky přeložený název:
Standardní zkušební metoda pro Viskozita celulózových derivátů Ball-Drop
NORMA vydána dne 1.6.2011
Označení normy: ASTM D1343-95(2011)
Poznámka: NEPLATNÁ
Datum vydání normy: 1.6.2011
Kód zboží: NS-17036
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
ball drop, cellulose esters, viscosity, Cellulose and cellulose derivatives, Cellulose esters, Ball drop method, Viscosity--paints/related coatings/materials, ICS Number Code 85.040 (Pulps)
Significance and Use | ||||||||||
This test provides an easy method of determining the viscosity of cellulose derivatives in a given solvent. The answers are in units commonly used in industrial practice. Such information is needed for cellulose derivatives that are to be extruded, molded, sprayed, or brushed as is or in solution. |
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1. Scope | ||||||||||
1.1 This test method describes the apparatus and general procedure for making ball-drop viscosity measurements on solutions of various cellulose derivatives. Instructions for sample preparation, solution concentration, and other details are discussed in the ASTM methods for the respective cellulose derivatives. 1.2 This test method is applicable to solutions of various cellulose derivatives having viscosities greater than 10 P, by using balls of various diameters and densities. Viscosity results are expressed preferably in poises. 1.3 In commercial practice, viscosities are often expressed in seconds using 2.38-mm (3/32-in.) stainless steel balls. When the viscosity is outside the practical range for these balls (75 to 300 P), the measurement can be made using a calibrated pipet viscometer or a different ball and calculating the observed viscosity to the corresponding time for a 2.38-mm (3/32-in.) ball, even though it is a small fraction of a second. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 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 and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||||
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