90
Common description
Anti-condensa-
tion paints
Binding - d own
paints
primers
Fire paints
and
retardant
Fungicidal paints
-
Heat resistant paints
High-hiding or one-coat paints
Inscticidal
paints
Multi-colour paints
Odourless paints
Quick-drying
paints
Sealers
Self-cleaning
paints
Thixotropic jelly paints
ог
Water - displacing paints
Composition
Table 4
PAINTS WITH SPECIAL PROPERTIES
Contain cork or other absorbent fill-
er
Paints with excess of penetrating med- ium
-
Various it is not enough for the com- ponents of the paint to be incom- bustible
Normal paints with the addition of fun- gicides
Various, e.g. silicone or butyl titanate as medium, often with aluminium pigment Contain high opacity pigments. Some are thixotropic (s e e Thixotropic paints, below) Special paints incor- porating contact in- secticides which bloom to the surface
containing
Paints separate globules dif- ferent in colour from the main body of the paint
Thinners and media (often alkyds) select- ed to minimize odou. Some incor- porate masking scents
Paints based on spe- cially selected thin- ners and media, usually modified alkyds. Cellulose and similar paints can al- so be so described. Various media ac- cording to purpose, often pigmented with aluminium
1. Paints with media
and
pigments
which chalk free- ly
2. Paints with sili- cone additions
Modification of pig- ment or medium in high gloss, semi- gloss and flat paints Paints, usually pri- mers, incorporating displacing
water fluids
-
Use
Where limited in- termittent conden- sation occurs
To bind down friable surfaces of plaster or old paint or distem- per in cheap work To reduce fire risk, particularly spread of fame. on com- bustible surfaces
Where conditions permitting the growth of mould cannot be cured, or cannot be cured im- mediately
On surfaces that be- come hot
In decorative work where conditions are not severe
To kill insects which have contact with the coating
use-
To obtain a varie- gated effect ful, for example, in hiding surface irre- gularities
In food stores, hos- pitals. etc.
Where time is short
To prevent underly- ing material from bleeding through to the surface
I. Where surface must remain clean e.g. railway signals
2. For rainwashed
areas out-doors or where cleaning is to be undertaken For use by amateurs or where heavy coats are required
Under adverse ог winter conditions
Comments
The paints absorb moisture, making small amounts of condensation inconspicuous, but are not able to deal with heavy or continual condensation. The amount of loose material such paints can bind down is obviously limited.
Proper pre- paration is to be preferred.
Paints should have been tested by the methods of B.S.476, Part 3. The intumescent paints swell up to provide an insulating porous coat- ing of incombustible material.
These paints have material advantages in bre- weries, bakeries, textile mills, etc., but careful preparation of the surface is necessary and the possibility of foot contamination needs to be considered. The fungicidal properties may not last the full life of the paint.
A range of materials, from special radiator paints to paints for factory chimneys, exhausts, etc.
Many established finishes can hide in one coat, but rather less skill is needed to do so with the one-coat paints. The single coat being thinner than a full paint system, it affords less protec- tion. A primer is needed on new surfaces. The paint should retain its efficiency, even if washed, for more than a year. But use in food factories may mean that the dying insects are insufficiently alert to escape incorporation in food being mixed.
Spray application essential for good effect.
Useful materials, with the properties of normal high-gloss paints. Although smell may be avoided, confined spaces should still ventilated while painting and while paint is drying.
Some of these paints are suitable for use out- doors, but are better confined to less severe conditions indoors, unless the manufacturer can produce evidence of satisfactory experience.
Sinall amounts of creosote or bitumen can be sealed successfully, but the paint over sub- stantial deposits may flake or craze
I. These free-chalking paints weather away faster than normal paints and so must be thickly applied.
2.
Not fully assessed. The advantages may lie in ease of cleaning rather than in less deposition of dirt.
Avoids settling in the can, and permits heavy coats to be applied without sagging or drip- ping. Gloss is sometimes slightly lower than with high-gloss paints.
While these paints may offer a marginal ad- vantage they do not justify any avoidable re- laxation of normal craftsmanship.
THE HONG KONG & FAR EAST BUILDER—VOLUME 17, NUMBER 3