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C.I. PIGMENT WHITE : 32
C.I. CONSTITUTION No. : 77964
CAS No.: 7779 – 90 – 0
 
ITS USES AS AN ANTI-CORROSIVE PIGMENT
 
ZINC PHOSPHATE-1520
ZINC PHOSPHATE is a valuable corrosion resistent Pigment and we are happy to introduce it as an addition to our existing products ALUMINA HYDRATE and GLOSS WHITE. ZINC PHOSPHATE is in more use in the West.
CHEMICAL NATURE
This Pigment is essentially ZINC PHOSPHATE Dihydrate and corresponds to the formula Zn 3 (PO 4 ) 2 . 2H 2 O. It is a white, non toxic Pigment and is prepared by precipitation.
TYPICAL CHEMICAL ANALYSIS IS GIVEN BELOW
CHARACTERISTICS ANALYTICAL DETAILS
Description White, Micro-Crystallian Powder
Chemical Formula Zn3 (PO4)2 . 2H2O
Residue on Sieve of 240 Mesh 0.5 % Max
Specific Gravity 3.3
Bulk Density 0.6 to 0.9 G/ML
Oil Absorption 19 ± 2 Gm of Oil per 100 Gm of Pigment
Loss on Ignition 8.5 to 10 % by Mass
Matter soluble in water 0.5 % Max
Zinc content of Ignited sample 50.5 to 52.0 % by Mass
COLOUR
ZINC PHOSPHATE is white in appearance and of low opacity, making it adaptable to wide range of colours, by incorporating other pigments.
NON-TOXICITY
Both red lead and calcium plumbate pigments are toxic. this not only limits their usage, but means that they can only be sprayed with elaborate precautions. Primers containing ZINC PHOSPHATE are not toxic.
PERFORMANCE
Standard corrosion control tests can be misleading when evaluating the performance of ZINC PHOSPHATE-based Primers. The Girder Test and performance are more reliable guides.
APPLICATIONS
It is compatible with a vide variety of media including alkyds epoxy esters, chlorinated rubber, polyurethene etc. Though the exact mechanism is not thoroughly understood, it is probable that, due to its slight solubility ZINC PHOSPHATE reacts by polarising both anodic and cathodic areas. The Pigment also physically prevents passage of water and salts. Thus the corrosion resistance characteristics of ZINC PHOSPHATE Pigment factors.

ZINC PHOSPHATE is used in corrosion resisting primers and undercoats.Good brushing characteristics can be obtained with ZINC PHOSPHATE Primers, which are suitable for both airless and conventional spray application. None of these methods entails a health hazard.

In contrast with the majority of red lead primers which are formulated in slow drying oils, it is now possible to formulate a 2-hour overcoatable paint based on ZINC PHOSPHATE, without detriment to its anti-corrosive properties.
MECHANISM OF CORROSION PROTECTION
A number of explanations have been put forward about the effectiveness of ZINC PHOSPHATE in inhibiting rust formation. Among these are suggestions that it reduces the diffusion rate of ammonium ions through paint film, that it slowly “phosphates” the metal surface, rendering it passive, or that, as a result of complex formation between ZINC PHOSPHATE and the media, a highly stable film is produced.
ADVANTAGES
ZINC PHOSPHATE has the advantage of bright white colour and non toxic nature over other Corrosion Resistant Pigments much as Zinc Chromate, Zinc Tetroxy Chromate and Barium Chromate.

The use of ZINC PHOSPHATE in Primers promotes excellent inter-coat adhesion, particularly under conditions of high humidity.
COST
The lower price of ZINC PHOSPHATE relative to that of red lead on a volume basis, could contribute significantly to savings in manufacturing costs.

Paint systems incorporating ZINC PHOSPHATE Primers are generally comparable in cost to those utilising other types of primer.

NOTE : The tests and results shown were conducted in our laboratories. They do not constitute a guarantee and it is suggested that you carry out your own evaluations prior to the adoption of these products.

NOTE : The products are offered without patent protection. For this reason and before submitting orders, it is purchaser’s responsibility to ensure that products requested are not covered by any patent in his country.

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