Centellen® seals


Centellen® gaskets are fiber gaskets that we manufacture using our production processes from unprocessed sheet material from our supplier Hecker Werke. The Centellen gaskets available from us are characterized by excellent gas tightness. 

Centellen sealing material is available to us in various qualities. As standard, we process Centellen HD 3822, a further development of Centellen WS 3820, and Centellen R WS 3825. 

Centellen gasket from HD 3822

Centellen® qualities available from Rehm Dichtungen

Centellen sealing material is available to us in various qualities. As standard, we process Centellen HD 3822, a further development of Centellen WS 3820, and Centellen R WS 3825. 

Centellen® HD 3822

Centellen® HD 3822

Centellen® HD 3822 is a further development of the material Centellen WS 3820, which is known as a special quality for high pressures with good pressure resistance at good gas density. The reason for the further development of Centellen WS 3820 lies in the area of mechanical requirements. Nevertheless, seals made of Centellen HD 3822 and seals made of Centellen WS 3820 have similar resistance data.

Centellen HD 3822 are fiber gaskets composed of high quality aramid and inorganic fibers bonded with NBR rubber.

Technical data sheet:

Centellen® HD 3822

Properties:

Density [g/cm³] DIN 28090-2 1,8
Compressive creep strength (16h, 175 °C) [N/mm²] DIN 52913 35
Gas density[cm³/min] DIN 3535/6 0,5
Max. Pressure [bar] 150
Max. Temperature (short time) [°C] 400

 

Consequently, gaskets or flat gaskets made of Centellen HD 3822 have the following properties:

  • High pressure resistance
  • Very low gas leakage
  • Very good oil resistance
  • Good tensile strength

Seals made of Centellen HD 3822 meet the requirements of gas supply and are used in particular where higher pressures as well as medium temperature ranges exist. The classic areas of application include the chemical industry, plant and mechanical engineering, and the food industry.

Clearances:

  • BAM (for gaseous oxygen)
  • DVGW (suitable as sealing material for gas supply, type DIN 3535-6)
  • HTB DIN 30653 (suitable as sealing material for screwed joints and flanges in connection with gas meters and pressure regulators as well as flanged joints in gas installations)
  • KTW (approved for use with drinking water according to the recommendations of the BGA)
  • WRC (approved as a sealing material for use with drinking water up to 85 degrees Celsius)
  • TA-Luft (leakage criterion high quality in the sense of TA-Luft approval according to VDI guideline 2440)
  • W270 (certified as a sealing material for contact with drinking water)

 

Centellen® R WS 3825

Centellen R WS 3825

The material Centellen R WS 3825 is the special quality of Hecker Werke, which has the best gas tightness with good pressure resistance in the temperature range of up to 200 degrees Celsius. The gasket material is composed of aramid fibers, inorganic fibers, recycled material of high quality aramid grades, which are bonded with the help of a rubber mixture. Applications for gaskets made of Centellen R WS 3825 include the wastewater and heating sectors and mechanical engineering.

Technical data sheet:

Centellen R WS 3825

Properties:

Density [g/cm³] DIN 28090-2 1,8
Compressive creep strength (16h, 175 °C) [N/mm²] DIN 52913 35
Gas density[cm³/min] DIN 3535/6 0,5
Max. Pressure [bar] 150
Max. Temperature (short time) [°C] 400

 

Clearances:

  • BAM (for gaseous oxygen)

 

The resistances of Centellen® seals

The Centellen gaskets available from Rehm Dichtungen Ehlers GmbH are resistant to hydrocarbons such as oils or solvents, alcohols, glycols, aqueous solutions, water and steam up to 250 degrees Celsius (gaskets made of Centellen HD 3822) and 150 degrees Celsius (gaskets made of Centellen R WS 3825). While Centellen HD 3822 is conditionally resistant to ketones and esters, chlorinated solvents, strong alkalis and inorganic acids, the gasket material Centellen R WS 3825 is not resistant in this respect.  

We will be happy to answer whether Centellen® materials are also suitable for your purposes. Please contact our customer service for comprehensive advice.

FAQ

What are Centellen seals?
Centella gaskets belong to the group of fibrous materials and are purchased by us from the manufacturer Hecker Werke. Due to their good pressure resistance as well as high gas density, gaskets made of centella can be described as high-pressure gaskets.
What are the properties of seals made of centelles?
Seals made of Centellen are characterised above all by their high pressure resistance as well as high gas tightness. Other properties of Centellen HD 3822 include very low gas leakage, very good oil resistance and good tensile strength.
What is the difference between the Centellen WS 3820 and the Centellen HD 3822?
Centellen HD 3822 is a further development of Centellen WS 3820. The aim of the further development is to improve the material with regard to mechanical overloads of WS 3820. Except for different mechanical aspects, similar resistance data are available for Centellen HD 3822 and Centellen WS 3820.
Are Centellen seals temperature resistant?
While seals made of Centellen HD 3822 can be used in the temperature range from -100 to +250 degrees Celsius, seals made of Centellen R WS 3825 are suitable for use in the temperature range from -100 to +200 degrees Celsius. Accordingly, seals made of Centellen are temperature-resistant.
Can Centellen gaskets also be equipped with self-adhesive?
Centellen gaskets can be equipped with basic self-adhesive. For this purpose, the unprocessed sheets are first glued with a self-adhesive film in order to subsequently produce your self-adhesive gaskets from centellas.
In which forms can gaskets made of Centellen be obtained from Rehm Dichtungen?
Just as with all our gasket materials, we use centelles to make you the right gaskets, flat gaskets or blanks using our waterjet cutting equipment. In addition to the manufactured Centellen gaskets, we can also cut the gasket material to the desired length and width. Finally, you can also purchase Centell sheets from us as unprocessed yard goods for your own production. All products available from us for the material Centellen can also be equipped with self-adhesive on one side.
Which sealing material from the supplier Hecker Werke is available from Rehm Dichtungen?
At Rehm Dichtungen Ehlers GmbH, we stock gaskets made of Centellen HD 3822 and Centellen R WS 3825 in various thicknesses as standard.