Coating technology

High performance down to the last nanometer – layer by layer


The right coating can increase performance and cost effectiveness: H-O-T offers the full range of technologies. In addition to standardized applications, we will also work with you to develop customized solutions – tailored exactly to your own requirements. Take advantage of our 30 years of expertise, impressive innovations and valuable expert knowledge about practical uses. We guarantee reproducible quality for every coating – as well as the entire H-O-T service package, of course.

Since 1988

H-O-T high-tech coatings have been in use. Globally – in all sectors of industry.

PVD- / PACVD-Beschichten

PVD coatings

PVD (Physical Vapor Deposition) stands for the physical deposition of thin layers from the vapor phase. This process produces layers with a high fraction of covalent bonds of the layer atoms.

Properties such as hardness and thermal and chemical stability are significantly enhanced by the PVD coating of precision tools and high-quality components. At the same time, properties such as the coefficient of friction and the tendencies to jam, clog, stick, corrode and oxidize are significantly reduced. Our high-tech coatings have been used in all sectors of industry since 1988.



PACVD coatings

PACVD (Plasma Assisted Chemical Vapor Deposition) is a development of the CVD process and combines the advantages of both the PVD and the CVD processes. In the PACVD process, the coating is deposited by a chemical reaction from the gas phase at temperatures below 180°C with plasma Support.



Our customers come from the following sectors:

  • Automotive industry
  • Medical technology
  • Aerospace industry
  • Medical technology
  • Textile industry
  • Mechanical engineering
  • Tool making

Schichten im Werkzeugbereich

Our coatings are the preferred coatings for machining, shaping and stamping processes, plastics technology and in all areas where tribological properties need improvement.

Our PVD coatings excel in the machining industry as a result of the following advantages:

Für den Anwendungsbereich Zerspanungstechnik zeichnen sich unsere PVD-Schichten durch folgende Vorteile aus:

  • Significantly longer service life
  • No material build-up on the cutting edges
  • Better heat removal through cutting chips
  • Increased cutting parameters
  • Dry machining possible
  • High speed cutting possible

Application-oriented recommendations can be found in our data sheet.

Shaping and stamping technology

Our PVD coatings excel in the shaping and stamping industry as a result of the following advantages:


  • Low tendency to material build-up
  • Significantly longer service life
  • No sticking and cold build-up
  • Optimization of the flow characteristics
  • Clean cuts and therefore less dressing needed for the work-piece. Reduced coefficient of friction and therefore reduction in the stamping and retraction forces.

Application-oriented recommendations can be found in our data sheet data sheet.

Plastics technology

Our PVD coatings excel in the plastics processing industry as a result of the following advantages:


  • Excellent wear protection
  • Protection of structured tools and protection against damage to finishes
  • Improved release properties
  • Faster filling & shorter cycle time
  • Reduced cleaning through reduction of plate -out
  • Increased production reliability
  • Improved surface quality of the plastic parts
  • Reduced distortion of the plastic parts

Application-oriented recommendations can be found in our data sheet.

Tribological coatings for tools

In the fields of tool and die making, machine and mold construction and the machining of aluminum, we favor TT®-DLC and TT®-C-DLC as tribological coatings.

TT®-DLC is a metal-free diamond-like layer of carbon and is deposited at low temperatures using the PACVD process. The combination of good wear-resistance and outstanding frictional and non-stick properties makes TT®-DLC coatings an ideal surface treatment for components and tools subject to high frictional forces.

TT®-C-DLC coatings are a sub-group of the amorphous, diamond-like carbon coatings (DLC – Diamond-Like Carbon). Unlike the majority of the commercially available TT®-DLC coatings, they are not deposited from gaseous hydrocarbons (e.g. acetylene or methane) using the plasma-activated CVD process (PACVD-Plasma Assisted Chemical Vapor Deposition). They are produced using the PVD process (Physical Vapor Deposition) by sputtering a carbon target. The addition of reactive gases during the coating process enables the hydrogen content and therefore the mechanical and tribological properties of the coating to be adjusted to optimize the properties for the application in question.

TT®-C-DLC coatings can achieve both a higher hardness and a lower coefficient of friction than the TT®-DLC coatings deposited by the PACVD process. The properties of TT®-C-DLC coatings are summarized in the table.

TT®-C-DLC coatings are normally deposited with a thickness of 1.5 ± 0.5 μm. Because of their properties, TT®-C-DLC coatings are readily used when manufacturing standard components.




Reliable high quality over a long period:

hi-Fusion significantly improves the surface hardness – enabling you to win the struggle against wear. It also prevents the mold surface from being scratched, as well as the edges from becoming brittle and the plastics from sticking to the tool. Using hi-Fusion also saves you time and money in post-treatment.

Experience coating technology that is more advanced than ever.

Ensures brilliant results.

Reduces maintenance, repair and reject costs.

Increases productivity by approx. 60%.

hi-Fusion – The new quality class for durability and cost effectiveness

Plasma-supported diffusion coating for surfaces for plastic injection molds

Mold insert made of 1.2344 can be coated with hi-Fusion
Mold insert made of 1.2344 can be coated with hi-Fusion

hi-Fusion is a plasma-supported diffusion process for the targeted optimization of mold surfaces (in plastic injection molding) in series production.

hi-Fusion in practice
Hard facts to put you one step ahead ...

  • Improves scratch resistance
  • Increases wear resistance
  • Raises corrosion resistance
  • Improves polishing ability
  • Reduces maintenance costs
  • Extends service life
  • Ensures consistent quality

Production details

Suitable materials::

1.2343 | 1.2344 | 1.2379 | 1.2311 | 1.2738 | 1.2083
(vergütet und angelassen > 420° C)


Polished and structured surfaces

Delivery condition:

Metallically bright and disassembled

Coating systems:

Combination with PVD and PACVD coatings possible

Machine size:

ø 1.200 x 2.400 mm (other dimensions on request)

Individual weight:

Max. 5 metric tons (other weights on request)




Scratch resistance by comparison
Scratch resistance by comparison

hi-Fusion is already impressing the following sectors:

Electrical engineering, automotive, domestic appliances, packaging industry, medical technology and toys.

Talk to us.
We’ll be happy to advise you.

T: +49 (0)911 36014-1042


UniTwin® hybrid surface treatment is a combination of a special plasma nitriding process with a subsequently applied hard coating.


Areas of use

  • Metal forming dies up to 500°C
  • Molds and transport elements for plastics
  • Die-casting tools


Material groups

  • Tool steels
  • Powder metallurgy materials
  • Special materials

The advantages

  • The supporting effect of the nitrided layer reduces the “eggshell effect” and reduces wear on the functional layer
  • Significant increase in the service life of tools and machines
  • Avoids abrasive and adhesive wear
  • Improves demolding characteristics
  • Very good coating adhesion