Vulclast® Tensile Strength Test

When it comes to sealing reliability, the joint is often the weakest point. To demonstrate the superior performance of Vulclast® technology, a tensile strength test was carried out using 5.33mm FKM 75 Shore O-ring cord. The test compared three joint types:

Butt-joined cold bonded
Butt-joined hot bonded
Vulclast® joint

Test Objective

The goal was to measure and compare the tensile strength of each joining method, highlighting the durability and reliability of Vulclast® over conventional bonding techniques.

Test Method

Material used	5.33mm diameter FKM 75 Shore A O-ring cord
Joint types tested	Cold bonded, hot bonded, and Vulclast®
Procedure	Samples were prepared with cord from the same batch, joined using the respective method, and tested under tensile load until failure occurred.

Results

Cold Bonded Joint	Failure occurred at the bond line under relatively low tensile load, indicating weak adhesive strength.
Hot Bonded Joint	Improved performance compared to cold bonding, but still failed prematurely at the joint.
Vulclast® Joint	Withstood significantly higher tensile loads, with the joint proving as strong—or stronger—than the parent material.

Conclusion

The results clearly show that Vulclast® delivers superior tensile strength compared to traditional butt-joined cold and hot bonding techniques. By eliminating the bond line weakness and eliminating the use of glue, Vulclast® ensures:

Enhanced joint reliability
Extended seal life
Reduced risk of premature failure in critical applications

Vulclast® sets a new standard in O-ring cord joining technology, offering strength, consistency, and performance unmatched by adhesive-based bonding.