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MATERIALS USED

Non-corrosive steel

All units and parts listed in this catalogue are produced from non-corrosive acid-resistant Cr – Ni steel ČSN 17 240, which is the equivalent of the German standard DIN 1.4301. If the corrosion-proof requirements of the parts are higher they are produced from non-corrosive Cr-Ni-Mo steel ČSN 17 349 which conforms to DIN 1.4404.

Chemical composition of the most frequently used non-corrosive steels

ČSN PN	%C max.	%Si max.	%Mn max.	%P max.	%S max.	%Cr max.	%Mo max.	%Ni max.	%Ti max.
17 240 17 249 17 346 17349 17 248 17 348	0.07 0.03 0.07 0.03 0.08 0.08	1.00 1.00 1.00 1.00 1.00 1.00	2.00 2.00 2.00 2.00 2.00 2.00	0.045 0.045 0.045 0.045 0.045 0.045	0.030 0.030 0.030 0.030 0.030 0.030	17-19 18-20 16.5-18.5 16.5-18.5 17.00-19.0 16.5-18.5	- - 2.0-2.5 2.0-2.5 - 2.0-2.5	8,5-10,5 10.0-12.5 10.5-13.5 11.0-14.0 9.0-12.0 10.5-13.5	- - - - >=5xC >=5xC

Technical information for gaskets

Title	Silicon (VMQ silicon rubber)	EPDM (ethylene-propylene-diene rubber)	Viton (FPM fluorine rubber)	Perbunan (NBR nitrile rubber)	PTFE (polytetrafluorethylene)
Temperature of use	It is stable in water up to 100 °C Possibility of sterilisation by steam short-term up to 120 °C to 130 °C	Permanent operating use from 40 °C to +140 °C Possibility of sterilisation by steam up to 130 °C	Permanent operating use from 20 °C to +200 °C Possibility of sterilisation by steam short-term up to 130 °C to 140 °C	Permanent operating use from 25 °C to +110 °C Possibility of sterilisation by steam short-term up to 130 °C	Up to +200 °C it is physiologically harmless use from 200 °C to +260 °C
Recommended use	High temperature load capacity It has good resistance to cold, suitable for food, it has dielectric properties. It has good resistance to alcohols.	It has good resistance to swelling for: Diluted inorganic and organic acids, media, oxidising media, lyes, and ketones Hot water and steam up to 130 °C	It has good resistance to swelling for: Mineral oils Plant and animal oils Lubricants (also some additives) Fuels	It has good resistance to swelling for: Aliphatic hydrocarbons (such as propane, butane, benzine, mineral oil) Lubricants based on mineral oil	It has good resistance to swelling in almost all parts It has a smooth and repellent surface so sticking does not occur It has better chemical resistance than in all other elastomers Non-flammable material
Limited use (border)	Shows high swelling for: Low-molecular esters and ethers Aliphatic and aromatic hydrocarbons Concentrated acids and alkali	Cannot be used for: Plant and animal oils Aliphatic, aromatic, and chlorinated hydrocarbons Mineral oils	Shows high swelling for: Polar solvents, such as acetone, methyl ketone, ethyl acetate, diethyl ether, and dioxane Low-molecular organic acids (formic acid and acetic acid) Gaseous ammonia, amines and alkanes Overheated water steam	Not resistant to: Polar solvents Chlorinated hydrocarbons Ketones Aromatic hydrocarbons (benzol) Esters	Not resistant to: Liquid alkaline metals and some compounds of fluorine in connection with higher pressure and temperature The material does not show the flexibility of rubber.
Material approval	BGA/FDA	BGA/FDA	BGA/FDA	BGA/FDA	BGA/FDA

BGA = approval of the “Federal Health Authority” in Germany (“Bundesgesundheitsamt”)
FDA = approval of the “US Food and Drug Administration“