SAND-LIME BRICK. 347 
easily crushed sandstone are available in abundance, and some 
of this material has produced the very best quality of sand-lime 
brick. 
TABLE XIX.—Sand-lime brick made from Benguet sandstone. 
Compressive 
strength. 
Mix- . . Area of 
ture Siliceous material. Dimensions bearing 
No. * | surface. Per 
Total. square 
inch. 
Inches. Sq. in. | Pounds. | Pounds. 
25 | Benguet sandstone No. 1__--_---- 3X3X2. 25 6.75 32, 215 4,772 
26 | Benguet sandstone No. 2________- 3X3X2. 25 6.75 49,410 | ®7,320 | 
— 
a Plate V, fig. 2, is a photograph of a brick obtained from this mixture. The front 
surface has been polished and the color is a very pleasing cream-gray, spotted with quartz. 
The density of this brick was 1.82 (air-dried), and it absorbed 4.35 per cent of water when 
submerged for 24 hours. 
Aside from the fitness of available raw materials, the possi- 
bility of successful, commercial manufacture of sand-lime bricks 
in this locality involves complicated and uncertain financial 
considerations. : 
FINANCIAL CONSIDERATIONS. 
In Germany the average cost of manufacturing common sand- 
lime brick is approximately 6 pesos (8 dollars United States 
currency) per thousand,” and in America the average cost is 
about 8 pesos for common, and 9 pesos for face, brick. An idea 
of the cost of manufacture under favorable and unfavorable 
conditions may be obtained from estimates which were presented 
to the First Annual Convention, National Association Manu- 
facturers of Sand Lime Products.*® One estimate which con- 
siders coal at 8.50 pesos per ton, lime at 1.60 pesos per barrel 
(185 pounds, net), and sand at 1.20 pesos per cubic yard, put the 
cost of manufacture at 10 pesos per thousand. Another placed 
the total cost at 7.20 pesos per thousand, allowing for slack coal 
at 2.90 pesos per ton and lime at 80 centavos per barrel. HE. C. 
Eckel *° has estimated the cost of manufacture at a small plant 
(10,000 bricks per twenty-four hours), where sand was obtain- 
“ Consul-General Skinner, U. S. Daily Consular and Trade Reports, 
Bureau of Manufactures (1911), No. 9. 
* Clay Workers (1904), 42, 582-591. 
* Cements, Limes and Plasters. New York (1905), 141. 
