Polypropylene copolymers have outstanding chemical resistance and show the highest resistance of all thermoplastics to organic chemicals. High density polypropylene has some similarity with Polypropylene co-polymers in respect of chemicals resistance, although here again Polypropylene co-polymers possesses the additional advantages of being usable at higher operating temperature. Both the polymers have similar solubility parameters and tend to swell by the same solvents.
In both the cases the absence of any possible interaction between the crystalline polymer and the liquid prevents solution of the polymers in any liquid at room temperature. Polypropylene copolymers also possess an extremely high resistance to inorganic environments. It is not attacked by aqueous solution of inorganic salts not by most mineral acids and bases, even when in concentrated form, though it is liable to be attacked by oxidising agents e.g. 100% fuming Nitric acid and Sulphuric acid or the halogens.
Polyacetal is used in many static and dynamic industrial applications replacing materials like; steel, brass, bronze, copper and aluminium. Polyacetal have improved part life because of; better wear, more chemical & corrosion resistance.These materials reduce factory noise and will reduce or eliminate the need for lubricants
Railways :Pedestal Liner, Bush, pinion, wear pad.
Paper mills :Dryers Gears, Liner, Bush, Pulleys, Rollers.
Sugar Mills :Mill bush, liner, Wear plates, pulley, wear pads.
Cement Plants :Ropeway pulley, Uncoupling wheel, bush.
Textile Ind. :Bevel Gears, Bearings, Bushes.
Tyre Ind.:Guides, Bush, Gear, Bead Separator.
Steel Plants :Slipper pads, Bearings, Gear, Insert.
Chemical Plants :Wear pads, Scrapper.
Automobiles :Wear pads, Rings, Brush, Washers.
Bottling Plants :Star wheel, Guides, Sprockets.