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General Markings<br />
This table of resistance shall only be the line of direction. It cannot be<br />
regarded to be fully complete or absolutely correct. The measures are<br />
obtained from experiences. Due to different applications and mixing of<br />
the mediums there may occure possible differences.<br />
The Mediums of Tightening and their Qualities<br />
Perbunan<br />
(Nitrilcaoutschouc) NBR<br />
Perbunan is of high resistance against oil, small concentrated solvents<br />
and many other mediums. Because of its high tightness it is also very<br />
suitable for gasvolumed fluids.<br />
Perbunan may be used at temperatures between 253 K and 373 K<br />
(-20°C and +100°C).<br />
It may not be used for some different types of hard-flamable hydraulic<br />
fluids.<br />
PTFE (Teflon)<br />
(Polytetrafluorethylen)<br />
PTFE is resistant against even all fluids, independent if it is solvents,<br />
lyes, acids or other fluids or gas.<br />
It has excellent qualities of glide and is suitable for a great range of<br />
temperature from 173 K up to 473 K (-100°C to +200°C).<br />
When being used in the high pressure area it is not recommended for<br />
more than 100 bar.<br />
Viton ®<br />
(Fluorelastomer/FPM)<br />
Viton is resistant against oils, fuels, solvents, acids and other aggressive<br />
fluids. The very good weather resistance is to emphasize.<br />
Dependent on purpose, Viton may be used at temperatures from 243 K<br />
up to 473 K (-30°C to + 200°C).<br />
Viton ® and Hypalon ® are products of DuPont Dow Elastomers.<br />
Sealing Material<br />
EPDM<br />
(Ethylen-Propylen-Terpolymer)<br />
Also known as APTK. EPDM is extremely resistant against light, ozone,<br />
weather and ageing. Can be recommended for use with acids (acc. to<br />
concentration), alkali, water, alcohol and cetone.<br />
Temperature range from -50°C to +130°C.<br />
Hypalon ®<br />
(Chlorsulfonyl-Polyethylen-Caoutschouc/CSM)<br />
Elastic rubber with excellent resistance against all kinds of weather<br />
influences and extreme resistance against oxidizing chemicals, heat and<br />
rub off.<br />
Temperature range from -40°C to +160°C.<br />
Ohasil 70<br />
(silicon modified EPDM-Terpolymerisat)<br />
High mechanical bearing at low and high pressure. Thermic pattern of a<br />
Silicon-rubber-quality. Excellent weather- and steam-resistance at low<br />
pressure deformation.<br />
To be used up to +195°C working temperature, +200°C short maximum<br />
temperature.<br />
Shore hardness according to <strong>DIN</strong> 53505 A<br />
28° to 38° – very soft<br />
40° to 50° – soft<br />
52° to 66° – middle soft<br />
68° to 78° – middle hard<br />
80° to 90° – hard<br />
92° to 100° – very hard<br />
S e a l i n G M a t e r i a l 185
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