Materials expertise



Discover the materials that serve as the cornerstone of vacuum technology, characterized by their exceptional mechanical properties and resistance to extreme conditions.

Materials in the Vacuum technology.

In addition to economic aspects (availability, machinability, etc.), factors such as low intrinsic vapor pressure and magnetic permeability as well as high mechanical strength and corrosion resistance are important prerequisites for a material to be used in vacuum technology.

Austenitic stainless steels have established themselves as standard materials in vacuum technology. These stainless steels are also used for fasteners such as our vacuum screws. One advantage of using the same materials in the vacuum system is that the same expansion behavior of the materials results in fewer uncertainties in the process.

In addition, the use of stainless steels for fasteners does not entail the risk of material fatigue as a result of hydrogen embrittlement, as is the case with alloy steels from strength class 8.8. The risk of cold welding (“seizing”) can be avoided by using a suitable coating or by selecting an alternative material.

Typical stainless steels and non-ferrous metals, from which our vacuum-optimizing screws are also made, have the following material properties:

Material Strength class Tensile strength Rm [N/mm²] min.* 0.2% proof stress Rp0.2 [N/mm²]* Density [g/cm³] Relative magnetic permeability*
Austenitic stainless steel A2 & stainless steel A4
≤1,3** ≤1,1**
Austenitic stainless steel A2 & stainless steel A4
≤1,3** ≤1,1**
Titanium size 2
Titanium size 5

* at room temperature 20°C
** Due to cold forming during the manufacturing process, the value for screws can vary greatly
(folding martensite)

Material selection

Core materials in vacuum technology.

Core materials in vacuum technology.

The materials used are crucial for high performance in vacuum technology. Explore the properties and applications of stainless steel A2, A4 and titanium, which are characterized by their particular suitability for vacuum technology requirements.

Stainless steel A2

Stainless steel A2 is the all-rounder material for vacuum technology. Thanks to its high availability, low inherent vapor pressure and good corrosion resistance, A2 has established itself as the standard in vacuum technology.

Stainless steel A4

A4 stainless steel has a higher molybdenum content than A2, which is reflected in better corrosion resistance and lower magnetizability.

Titanium Grade 2 & Grade 5

Titanium screws are characterized by their low weight (approx. -45% of the density of stainless steel), excellent mechanical properties (titanium size 5 > stainless steel strength class 80) and their very low magnetizability.