ASTM D6746-03
Standard Test Method for Raw Rubber or Unvulcanized Compounds8212;Determination of Tensile Green Strength

Standard No.

ASTM D6746-03

Release Date

2003

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM D6746-08

Latest

ASTM D6746-15(2020)

Scope

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

Tensile 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. Tensile green strength can be a good indication of processing behavior. It is a particularly important characteristic for all processing operations in which elongation predominates.

Tensile 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 tensile green strength and processing behavior over the whole range of processing conditions.

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

1.2 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.

ASTM D6746-03 Referenced Document

• ASTM D1349 Standard Practice for Rubber-Standard Temperatures for Testing
• ASTM D3182 Standard Practice for Rubber-Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets
• ASTM D412 Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers8212;Tension

ASTM D6746-03 history

• 2020 ASTM D6746-15(2020) Standard Test Method for Determination of Green Strength and Stress Relaxation of Raw Rubber or Unvulcanized Compounds
• 2015 ASTM D6746-15 Standard Test Method for Determination of Green Strength and Stress Relaxation of Raw Rubber or Unvulcanized Compounds
• 2010 ASTM D6746-10 Standard Test Method for Determination of Green Strength and Stress Relaxation of Raw Rubber or Unvulcanized Compounds
• 2008 ASTM D6746-08 Standard Test Method for Determination of Green Strength of Raw Rubber or Unvulcanized Compounds
• 2003 ASTM D6746-03 Standard Test Method for Raw Rubber or Unvulcanized Compounds8212;Determination of Tensile Green Strength
• 2002 ASTM D6746-02a Standard Test Method for Raw Rubber or Unvulcanized Compounds8212;Determination of Tensile Green Strength
• 2002 ASTM D6746-02 Standard Test Method for Raw Rubber or Unvulcanized Compounds8212;Determination of Tensile Green Strength