Logo

ASTM D6746-08

Historical Revision

Standard Test Method for Raw Rubber or Unvulcanized Compounds—Determination of Tensile Green Strength

$83.00

$83.00

$149.40


Sub Total (1 Item(s))

$ 0.00

Estimated Shipping

$ 0.00

Total (Pre-Tax)

$ 0.00


...

1.1 This test method covers a method to evaluate a characteristic of raw rubber or unvulcanized rubber compounds that is designated as green strength. This special strength property for uncured rubbers is an important processing performance attribute in rubber product manufacturing.

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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.

The stress-strain properties of unvulcanized rubber (either in a compound or in the raw state) are important to certain processing operations in the rubber industry. These unvulcanized rubber properties are frequently referred to as green strength, denoting that the final vulcanization cycle has not yet been achieved.

Green strength is determined primarily by the physical and chemical characteristics of polymers, such as molecular weight, tendency to crystallize, degree of branching, and so forth. It is also related to the compound formulation, particularly filler and plasticizer content, and the presence of peptizers. Green strength can be a good indication of processing behavior. It is a particularly important characteristic for all processing operations in which elongation predominates.

Green strength is dependent on the test piece preparation, rate of extension, and test temperature. Therefore, a single-point method cannot be expected to give correlation between green strength and processing behavior over the whole range of processing conditions.

SDO ASTM: ASTM International
Document Number D6746
Publication Date May 1, 2008
Language en - English
Page Count 5
Revision Level 08
Supercedes
Committee D11.12
Publish Date Document Id Type View
Nov. 1, 2015 D6746-15 Revision
March 1, 2010 D6746-10 Revision
May 1, 2008 D6746-08 Revision
Dec. 1, 2003 D6746-03 Revision
June 10, 2002 D6746-02A Revision
Jan. 10, 2002 D6746-02 Revision
June 1, 2020 D6746-15R20 Reaffirmation