ASTM D1646 PDF

This standard is issued under the fixed designation D ; the number 1 These test methods are under the jurisdiction of ASTM Committee D11 on. CCSi Ultra-Life Specimen Cutting Dies: ASTM D D Upper Specimen Die. D Lower Specimen Die. CCSi manufactures these high quality. Standard Astm d – Download as PDF File .pdf), Text File .txt) or read online.

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Historical Version s – view previous versions of standard.

Since rubber behaves as a non-Newtonian fluid, no simple relationship exists between the molecular weight and the viscosity. Therefore, caution must be exercised in interpreting viscosity values of rubber, particularly in cases where molecular weight is very high.

Xstm these higher molecular weight rubbers, better correlation between viscosity values and molecular weight is obtained if the test temperature is increased. Viscosity and stress relaxation behavior do not depend on such factors as molecular weight and non-rubber constituents in the same way.

Thus both of these tests are important and complement each other. A slow rate of relaxation indicates a higher elastic component in the overall response, while a rapid rate of relaxation indicates a higher viscous component. The rate of stress relaxation has been found to correlate with rubber structure characteristics such ast molecular weight distribution, chain branching, and gel content.

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Therefore, this test method can be used to measure incipient cure scorch time and the rate of cure during xstm early stages of vulcanization. This test method cannot be used to study complete vulcanization because the continuous rotation of the disk will result in slippage when the specimen reaches a stiff consistency.

Testing Standards List

Mooney viscosity is defined as the shearing torque resisting rotation of a cylindrical metal disk or rotor embedded in rubber within a cylindrical cavity. The dimensions of the shearing disk viscometer, test temperatures, and procedures for determining Mooney viscosity are defined in these test methods.

Viscosity as used in these test methods is not a true viscosity and should be interpreted to mean Mooney viscosity, a measure of shearing torque averaged over a range of shearing rates. Stress relaxation is also a function of the test configuration and for these test adtm the results are unique to the Mooney viscometer.

These test methods include procedures for measuring the initial rate of rubber vulcanization. In addition to a few insignificant differences there are major technical differences s1646 ISO and this test method in that ISO does not provide for sample preparation on a mill, while this test method allows milling sample preparation in some cases prior to running a Mooney viscosity test.

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This can result in different viscosity values for some rubbers. The values given in parentheses are for information only.

ASTM D1646

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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Historical Version s – view previous versions of standard Translated Version s: Link to Active This link will always route to the current Active version of the standard.