Material:

Materials are selected on the basis of their chemical and thermal stability relative to the medium to the sealed.
The  table  of  resistance schedules  the elastomers  customarily  employed  by  us.  In  most applications,  PERBUNAN  seals  are  employed.  Care should  also  be  taken  to  determine  whether  the  anti-corrosive  properties  of  the  metallic  components  are sufficient.

Protection against corrosion:

In  the  standard  models,  the  reinforcing  ring  is  of phosphatised deep-drawn sheet and the radial spring from size 111 or 211 upward of bright-drawn spring strip steel.
Seal sizes 100 to 110 and 200 to 210 are equipped with radial springs of stainless spring strip steel as standard.
From  size  111  or  211  upward,  the  seals  can  also  be equipped with stainless radial springs upon request.
Radial springs of spring-hard brass sheet are frequently employed for special sizes and designs.

Dependability of seal:

In  order  to  ensure  a  dependable  sealing  effect,  thepressureexerted by the medium to the sealed may not liftthesealing lip up off the mating surface. The maximumpermissiblepressure per seal size can be seen from thetables on pages 8 to 12. It is only permissible to increasethe sealing lip prestress by increasing the spring force ifa dependable seal cannot be ensured in any other manner.Otherwise, an increase in the sealing lip prestress wouldresult  in  unnecessary  friction  and  heat-up,  leading  tounnecessary wear.Peripheral and rotational speed:In order to avoid unnecessary heat-up and wear of thesealing lip, it is necessary to limit the peripheral speed atthe  sealing  lip  in  accordance  with  the  selected  sealmaterial.  Thepermissible rotational speeds for Perbunan® andViton®, by seal size, can be seen from the tables. The diagram provides a rapidoverview for Perbunan®.

Registrated Trademarks:
Viton® is a registered trademark of DuPont Dow Elastomers.
Perbunan® is a registered trademark of Bayer AG Leverkusen