Type of Treatment for ALPASTE  Treated ALPASTE and its property  Improvement of Adhesion & Peeling-proof   Electrostatic Property   Chemical Resistance (resistance to acid/alkali)  Water borne (Gas evolution)

A  Treated ALPASTE

Type	Treatment	Function
F Type	Polymer coating	Chemical resistance,
W Type	Treatment by inhibiter	Water borne metallic Paint

B Unique ALPASTE

Type	Treatment	Function
D Type	Deodorized	Printing ink
PCF Type	Resin coated flake	Powder Coating
Dry flake	Aluminium Flake Powder	ALC, Slurry Explosive, Plastic coloring
Solvent changed Type	Base solvent exchange	Printing ink, Marine, Plastic coloring

C Alloy Paste

Type	Treatment	Function
RFA Type	Stain less Paste	Exterior (chemical resistance)

Treatment		Non treated	Resin coating
Type			FX	FZ
Color appearance
Adhesion
Electrostatic property
Chemical resistance	Acid
	Alkali

Excellent Good Not functional

Note 1:	The above-mentioned are the data obtained by our varnish system and subject to being changed by the type of varnish or the particle size of ALPASTE.
Note 2:	The chemical resistance when the paint for plastic coating is used.

When being used to the plastic coating with 1-coat, ALPASTE may cause the poor adhesive problem, which is resulted in the poor scotch tape peeling test, by being affected by fatty acid on the aluminium flake surface. (No problem happens in the case of 2-coat film in which a clear-coat is applied.)

It is effective to prevent such problem to use the treated grades mentioned as below:

Resin coated flake (FX or FZ type)

Coated with acrylic resin

  

When the high voltage is applied to the metallic paint the oxidized film and fatty acid covering the aluminium pigments may cause the dielectric breakdown by being applied with high voltage, and the aluminium pigments are connected just like a conductor and let the electric current go to the earth side. Then the voltage cannot be applied to the paint for electrostatic coating.

The following processed grades are effective to prevent the said problem.

Resin coated flake (FX or FZ type)

Coated with acrylic resin

It is recommendable to use resin coated ALPASTE, which is uniformly coated with special polymer on the aluminium flake surface, for chemical resistant application.

Resin coated flake (FX or FZ type etc.) (There are some grades depending on the required application)

Application: Paint/ink for plastic coating Plastic coloring  Other general paint (It is also effective to improve adhesion and electrostatic property.)

Aluminium is well known as an amphoteric metal and generate the hydrogen gas by reaction with water at both pH areas, shown as below:

Acidic area:	2Al + 6H+  2Al3+ + 3H2
Alkaline area:	2Al + 2OH- + 2H2O  2AlO2- + 6H2

The oleic acid or stearic acid used as the milling agent of aluminium paste is thought to be absorbed on -OH and -O of the oxidized film of aluminium surface. But the fatty acid film is apt to be removed in the presence of water, and the surface oxidized film is too thin to prevent from reaction with water.

There are three typical measures to treat the aluminium flake surface so as to give it the water resistance:

	Treatment with inorganic compound (WJ, WX treatment,etc.)
	Treatment with organic compound (WE, WB treatment,etc.)
	Treatment in the paint manufacturing process

The stability and effect of the treatment to aluminium flake surface largely depend on the composition of binder to be dispersed and the pH area to be used.