48
Hong Kong Builder
ASPHALT EMULSION
Since the earliest days of history, asphalt has been recognised as the most effective of all waterproofing and protective coatings. Due, however, to the necessity of heating, requiring equipment and skilled labour in handling, its general use has been somewhat limited. Another disadvantage found in asphalt and asphaltic paints is their tendency to check and crack after com- paratively short exposure to weather and that will not bond well to damp or cold surface.
Cut-back asphalt coatings or paints are sold under many trade names and in some cases very extravagant claims are made as to their merits. These coatings are manufactured by taking what is left after crude oil is distilled, generally known as a residuum, and mixing with it while hot, a solvent which keeps the asphalt in solution. This solvent may be anything from common kerosene to chemicals.
These coatings always check and crack when exposed. Examination of these coatings which have been on over a period of even a few months will reveal cracks and checks. Certainly such coatings do not give protection.
With the development of asphalt emulsion, these disadvantages have been entirely overcome. "Flintkote" Asphalt Emulsion is made of special, highly refined asphalt, which has been beaten into infinitesimally small particles. These particles are held in suspension, or separation, by a thin film of a bentonite-like, or clay-like mineral mixed with water. Water will not mix with asphalt in any form. It does not mix with the asphalt in Flintkote Emulsion but merely serves to keep the
7358
ARCHITECTURAL SECTIONS
-541bs/R. -806 kg./m.
7359
particles of asphalt separated. These particles are so fine that a teaspoonful of emulsion may have millions of particles.
When the emulsion is applied to a surface, and the water evaporates, the particles attach themselves to each other, since there is no water film to prevent this action. Thus the coating becomes a continuous film of asphalt having in it a slight amount of clay-like mineral.
"Flintkote" Asphalt Emulsion requires no special equipment and will bond equally well to damp, cold, warm
or dry surfaces. It positively will not check or crack, run or sag, regardless of climatic temperatures or con- ditions of exposure.
The uses of the Asphalt Emulsion are numerous, such as the waterproofing of roofs, walls, floors, tanks and pools, dampproof plaster bonding, dampproofing floors for installing linoleum, composition tile and other decora- tive floor coverings, protective coating for steelwork, metal roof sheets and metal surfaces, surface and under- ground pipes, and the protection of wood, etc.
A great many uses of miscellaneous nature have been developed and unquestionably many more will be found as research work with the material is extended.
Flintkote Asphalt Emulsion is a quality coating, and its use is an economy, as it will give long and positive protection. Its use' is an investment, not an expense.
The local agents, Messrs. Davie, Boag & Co., Ltd. carry stocks and further information can be obtained from them.
Extruded Sections
7
531 lbs./N. 791 kq.m.
ALUMINIUM ARCHITECTURAL
SECTIONS
6481
6648
7651
1/
28-6
3-2
1
34.9
2
69-9
3.0
76-2
80-9
W
118
3-0
35.0
+627 (ba./f -935 kg./m.
|054 0L/R. 1-27 kg./m.
-991 kq./m.
Reduced facsimile of one of the pages in the Handbook
To the progressive architect who is always on the look-out for information concerning new materials that can be used to improve the design of projected construction, the new handbook "Aluminium Architectural Sections" will offer many suggestions for obtaining unusual modern effects.
The manufacturers claim that the growing use of extruded aluminium sections is becom- ing increasingly self-evident as owing to the smoothness of finish, the fineness and intricacy of detail in which they can be produced, they offer a valuable medium to the designer.
As a building material aluminium is low in cost, and the specific advantages are light- ness in weight, resistance to corrosion, work- ability, fineness of finish, and the mechanical properties which allow ultimate tensile strength exceeding 30 tons per square inch.
The booklet published by the Aluminium Union, Ltd. gives as complete information as is ordinarily required by an architect, but further information and assistance, either in advice as to which alloy should be used or as to the design of the section can be provided without obligation whatsoever through the local agents Messrs. Shewan, Tomes & Co., Ltd.