Bonding is a powerful joining technology that opens up ever new areas of application, from micro to macro, from living tissue to high-temperature use. The great variety of requirements on the adhesive bond and the manufacturing processes mean that an adhesive technology must always be tailored to the specific application.
The diversity and performance of adhesive composites is also reflected in the frequency and variance of the fields of application, which include microtechnology, construction including lightweight construction, optics and sensor technology, and medical technology. There is also great variability in the geometry and type of substrates such as metals, plastics, ceramics, glass and natural materials.
Because of the many different requirements, viable adhesive solutions require the best possible adaptation to the respective application. Thus, the selection/modification/formulation of the adhesive, the pre-treatment of the parts to be joined and the process control during production are derived from the requirement profile for the adhesive bond and any existing production-related boundary conditions.
In addition to the development and modification of adhesives according to the respective application and customer requirements (also conforming to standards), the characterization and suitability testing of adhesives is carried out by using the in-house equipment.
In addition to composite and load tests using universal testing machines or climatic testing technology, this also includes methods of material characterization such as thermal analysis or determination of Shore hardness, an uncomplicated procedure which is also used to characterize casting compounds and composite materials.
The digital hardness tester 3140 HO4 from Zwick GmbH & Co.KG is used for hardness testing Shore A and Shore D on plastics and elastomers. The test is carried out in accordance with DIN ISO 7619.
In Shore hardness testing, the resistance to penetration by a body is determined using a test stamp. The shape of the body as well as the spring force and measuring time are defined according to the sample to be analysed or the method to be used. The hardness value is obtained by pressing the test stamp onto the sample. Various operating modes allow to set series of measurements, measuring ranges and tolerance limits.
Choice of methods:
- Shore A ⇒ e.g. soft rubber, elastomers, natural rubber
- Shore D ⇒ e.g. plastics, rigid thermoplastics, hard rubber