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Application
Guide: High Performance Industrial Coatings
(Anti-Corrosive)
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Background:
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:In high performance,
anti-corrosive coatings, wollastonite has extensive history
as successful functional filler. Both treated and non-treated
versions are utilized in solvent and water-borne systems. Within
these resin types, wollastonite finds use in barrier coatings
and inhibitive metal primers.
The main attributes
for wollastonite are its alkaline pH, particle shape and excellent
weatherability.
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| Products
For Selection: |
Features
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Benefits
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Wollastonite |
- Ore
purity
- High
dry brightness
- Needle-like
shape
- Moh's
hardness (4-5)
- Low
moisture (<0.2%)
- Low
water solubility
- Alkaline
pH
- Low
cost
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- Inertness
& improved weatherability
- Film
reinforcement
-
Low moisture vapor transmission rate
- Improved
color
- Improved
film toughness
- Improved
corrosion resistance
- Favorable
cost vs. inhibitive pigments for improved formulation
cost
- Improved
impact strength
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Suggested
Grades and Loadings:
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| Product |
Base
Description |
Loading
(lbs/100 gal) |
| Wollastonite
905 |
325
mesh with low aspect ratio (5:1) |
0.5
- 1.5 |
| Wollastonite
800 |
Fine
grind, 3u aver particle size, with moderate aspect ratio (9:1) |
0.5
- 1.5 |
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| Expected
Observations: |
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Wollastonite
with low to moderate aspect ratio (i.e. 5:1 and
9:1) would provide superior appearance with very good flow properties.
Gloss control is generally the first observation. Wollastonite
can be used to substitute for part of the hardener to create flattening.
When trying to preserve high gloss, wollastonite may not be recommended.
Wollastonite
and mica can be used to create special effects and in some cases
surface treatment chemistries can be applicable.
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| Final determination of the
suitability of the material for the use contemplated is the
sole responsibility of the user. Manufacturer's only
obligation shall be to replace such quantity of the product
proven to be defective. |
