Proprietati cuple si fitinguri

Materials

1. White malleable Iron according to DIN EN 1562

This iron carbon is getting its characteristical qualities through a special heat treatment and not, like other materials, through its chemical consistance. Through this heat treatment all carbon is removed up to some mm depth from the surface. Thin walled parts get the structure of ferritic steels. This possibility to create complicated casted geometrical structures in combination with the high quality technical features of this iron (excellent for welding, forming and forging) makes white malleable iron to a flexible and exacting partner.

The toughness of white malleable iron avoids a braking of the material through heavy strain. A hose coupling overdriven by a truck will never break, it only gets oval. Through high expansion limits white malleable iron is suitable to be used at high temperatures, but also up to -60°C, because its firmness qualities improve with declining temperature.

Moreover malleable iron is easy to machine, has an excellent resistance against environmental influences and can be hardened with thermochemical processes.

White malleable iron "Made in Germany" guarantees us a constant high quality. Lüdecke uses as raw material for the production of fittings only castings made in german foundries.


2. Brass (MS 58/CuZn 39 Pb 3) Material 2.0401

Brass MS 58 is the mainly used alloy for all machining production procedures. It guarantees high durablility, can be galvanized excellent (nickel plating) and is as a result of its material characteristics extremely well suitable for all turned parts. Lüdecke uses for its production MS 58 in different profiles (Hexagon-, round-, pipe-profiles) or warm forged raw parts.


3. Free-cutting steel (11 SMn Pb 30)
Material 1.0718 acc. to DIN EN 10087

Good machining quality is the requirement for an economical production of turned parts with high precision and excellent surface quality. These characteristics fulfilles the material 1.0718, the possibility to weld, harden and for surface treatments is also guaranteed.


4. Stainless Steel, Material 1.4401 (ANSI #316)

Rust- and acid-resistance, excellent mechanical qualities and high durability at good machining qualities make this material to the ideal partner for high quality fittings to be used under extreme conditions with aggressive fluids.

Chemical composition:

5. Aluminium

The alloy Al Mg Si 1 F 31 can be hardened and is excellent resistant against corrosion. It can be polished, is resistant against chemical fluids and is well suitable for machining. This alloy is used by Lüdecke for forged parts. As profile material the alloy Al Cu Mg Pb F38 is used.

Sealing Material

General Markings

This Table of resistance shall only be the line of direction. It cannot be regarded to be fully complete or absolute correct. The measures are obtained from experiences. Due to different applications and mixing of the mediums there may occure possible differences.

>>Table of resistance


The Mediums of Tightening and their Qualities

Perbunan
(Nitrilcaoutschouc) NBR
Perbunan is of high resistance against oil, small concentrated solvents and many other mediums. Because of its high tightness it is also very suitable for gasvolumed fluids. Perbunan may be used at temperatures between 253K and 373K (-20°C and +100°C). It may not be used for some different types of hard-flamable hydraulic fluids.

PTFE
(Polytetrafluoräthylen)
PTFE is resistant against even all fluids, independent if it is solvents, lyes, acids or other fluids or gas. It has excellent qualities of glide and is suitable for a wide range of temperature from 173K up to 473K (-100°C and +200°C). When being used in the high pressure area it is not recommended for more than 100 bar.

Viton®
(Fluorelastomer/FPM)
Viton® is resistant against oils, fuels, solvents, acids and other aggressive fluids. The very good weather resistance is to emphasize. Dependent on purpose, Viton® may be used at temperatures from 243K up to 473K (-30°C to +200°C).

EPDM
(Ethylen-Propylen-Terpolymer)
Also known as APTK. EPDM is extremely resistant against light, ozone, weather and ageing. Can be recommended for use with acids (acc. to concentration), alkali, water, alcohol and cetone. Temperature range from -50°C to +130°C

Hypalon®
(Chlorsulfonyl-Polyethylen-Caoutschouc/CSM)
Elastic rubber with excellent resistance against all kinds of weather influences and extreme resistance against oxidizing chemicals, heat and rub off. Temperature range from -40°C to +160°C.

Ohasil 70
(silicon modified EPDM-Terpolymerisat)
High mechanical bearing at low and high pressure. Thermic pattern of a Silicon-rubber-quality. Excellent weather- and steam-resistance at low pressure deformation. To be used up to +195°C working temperature, +200°C short maximum temperature.

Shore hardness according to DIN 53505 A
28° to 38° – very soft
40° to 50° – soft
52° to 66° – midddle soft
68° to 78° – middle hard
80° to 90° – hard
92° to 100° – very hard