Physical Properties

Non-volatiles after stoving 1h/100°C
Solvent and etherification alchol
Specific gravity
Viscosity DIN No 4 20°C
Colour
Apperance
Acid value mg KOH/gm
Free formaldehyde

n.Haptane tolerance (C7H16, E. Merck quality)

60%
Isobutanol
0,99-1,00
700-900 seconds
Water white
very clear
2-5
Undetectable
by sulphite method
4-6 ml.*

MK 78 is dilutable with alcohols, ketons, esters and aromatic hydrocarbons.

Compatibility

MK 78 is completely compatible with drying and non drying short to medium oil alkyds, short oil epoxyesters, and epoxy resins but not compatible with nitro cellulose solutions. For nitro compatible urea resin please refer to MK 78-02 type

Recommendations for use

In conjuction with short oil alkyd resins at a ratio of 6:4 or 7:3 (solid basis) good quality stoving finishes can be obtained. The stoving schedule should be 30 minutes at 125°C. The best choice for optimum ratio is 6:4 according to the accumulated experiences over the years.

MK 78-02

This resin is basically the same as MK 78 but does not contain any formaldehyde scavenger. All physical and chemical properties are also identical to MK 78. However exclusion of the special scavenger enables MK 78-02 to be compatible with nitro cellulose MK 78-02 can also be used in any applications where MK 78 is used. MK 78-02 is mainly used in nitro cellulose lacquers for aluminium foils. In these system, addition of 7-8% MK 78-02 on total weight of the formulation is an adequate amount.

Examples

Typical stoving primer formulation based on MK 78

* The minumum quantity of solvent in cm3 tolerated by 5 gms of resin solution.

Information in this publication is to the best of our knowledge true and accurate. However, since condition under which our products may be used are beyond our control, recommendations are made without warranty or quarantee.