Membrane housings are designed for brackish water demineralisation or seawater desalination.
X type products have a thermoplastic inliner protecting the fiberglas shell from the chemical attacks of brackish- or seawater.
Knappe uses plastic resins from the following groups :
1) the polyolefin group ( Polypropylene [PPhomo,PPcopo,PPblock], Polyethylene [HDPA,LDPA] )
2) the styrenic group(PS,HIPS, ABS, SAN, MBS, MABS, PPO(Noryl) , SMMA, SBS, SEBS)
4) Rubber (EPDM)
The basic resins used by Knappe are:
HIPS(high impact polysterene), SMMA(styrene methyl-methacrylate), PPcopo, PVC(polyvinyl-chlorid)
and for Lip/O-rings EPDM
In order to obtain the best properties for the specific parts the plastic has to be modified.
Additives needs to be compounded with the basic resin. (for example glass, color, fillers, modifiers,UV absorbers..)
Plastic resins do not withstand all chemicals.
Please check for compatibility with Your medium used.
• first our compatibility list
• second use our service for sampling/probing media -- chemical
or products do not withstand to:
Ketones (examples: acetone, methyl ethyl ketone,formaldehyde...)
Esters (examples: ethyl acetate alphatic esthers..)
Ethers (examples: ethylene oxyde,dioxane..)
halogenated organic composites (examples:chloroform, methylene chloride, perchlore ethylene..)
Hydrocarbons (examples:benzene, cyclohexane, gasoline..)