ASTM D429-14 Standard Test Methods for Rubber Property-Adhesion to Rigid Substrates

The standard “ASTM D429-14 Standard Test Methods for Rubber Properties—Adhesion to Rigid Substrates” developed by the American Society for Testing and Materials (ASTM) describes test methods for testing the static adhesion strength of rubber to rigid materials (in most cases, metals). These methods include:

Method A - Rubber piece mounted between two parallel metal plates
Method B - 90 degree peel test - Rubber part mounted on a single metal plate
Method C - Measuring the adhesion of rubber to metal with a conical sample
Method D - Adhesion test - Post-vulcanization (PV) bonding of rubber to metal
Method E - 90 degree peel test - Rubber tank liner - Mounted on a single metal plate
Method F - Rubber piece mounted between two parallel convex shaped metal plates
Method G - Measurement of bond strength for rubber-metal bonded components with double-shear cylindrical specimen
Method H - Measurement of bond strength for rubber-metal bonded components by quadruple shear specimen

While these test methods can be used with a wide variety of hard materials, these materials are the exception rather than the rule. Therefore, the term metal materials is used instead of hard materials in the text.

This standard is not intended to address all safety issues, if any, associated with its use. It is the user of this standard's responsibility to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

These test methods are designed for samples prepared in a laboratory under standard conditions that can be used to provide data for the development and control of rubber compounds and manufacturing methods. These test methods are also used, with minor modifications, to obtain comparative adhesion test values of production parts when the design permits the preparation of suitable test specimens. Methods A, B, C and D are applicable to many product situations where rubber is used to control vibration.

ASTM D429 determines the bond strength of rubber to hard materials such as metals. This standard specifies several types of tests for bond strength of rubber, but Methods A and B are the most common.

Method A: Describes a tension test used to determine the bond of a rubber part mounted between two parallel metal sheets. This method determines adhesion values and tests the effectiveness of different processing techniques and different adhesive systems.
Method B: Describes a peel procedure for determining the bond strength between rubber materials and a metal plate or substrate. The value of interest is the bond strength, defined as the maximum force divided by the width of the sample. Results are obtained by measuring the force required to separate a rubber strip from a metal surface. The resulting data shows the bond strength along a line across the width of a rubber strip separated from a metal plate at a 90 degree angle.
Method C: Involves measuring rubber-to-metal adhesion with a conical sample. Provides data for the development and control of bonding systems and components. This test combines tensile and shear forces in the rubber sample material. Applicable to vibration or vibrating applications, but this test is not dynamic.
Method D: Adhesion test determines the bond strength of rubber to metal when the bond is formed after the rubber has been vulcanized. Vulcanization consists of a chemical reaction with sulfur and heating that improves the mechanical properties of the rubber. Rubber is usually bonded to metal during the vulcanization or heating process, but this method is for glue or other materials used after the rubber has been vulcanized.
Method E: This peel test determines the adhesion strength of the rubber tank liner to the tank wall. Results are obtained by measuring the tensile load required to separate the rubber strip from a metal surface at a 90-degree angle. This test is virtually identical to Method B except that it is applied only to the rubber liner of the tank wall.
Method F: The rubber piece method, which is mounted between two parallel convex shaped metal plates, determines the bond strength of rubber-to-metal bonding materials. Adhesion values are obtained by measuring the axial force required to separate the bonded rubber from the metal component. The interfaces between the metal and the rubber are convex. This geometry encourages interface failures.
Method G: Measurement of bond strength for rubber-to-metal bonded components by double shear cylindrical specimen. This method determines the relative bond strength between various adhesives. This test is often used to find out which adhesive is best for a given rubber. Specimens are placed in a shear test fixture and the shear stress is placed on the bond line. Shear testing is performed until a 5 mm depth failure occurs at the rubber-to-metal bond interface.
Method H: The method for measuring the bond strength of rubber-to-metal bonded components by quadruple lap shear specimen is the same as Method G, except that a fixture applying shear stress is not required, only a simple block placed on the test piece after the pre-stress is applied.

However, testing according to this standard has some strengths:

Accurately track peaks and valleys throughout adhesion testing to report accurate results
Maintaining unidirectional force throughout the peeling process from a substrate.
Proper handling of the sample.

Our organization has a strong staff that closely follows the developments in the world in the field of science and technology and constantly improves itself. Among the numerous test, measurement, analysis and evaluation studies provided for businesses in various sectors, there are also test services in accordance with the "ASTM D429-14 Rubber Properties - Standard Test Methods for Adhesion to Hard Substrates" standard.