cements, mastic



cements, mastic defined in 1909 year

cements, mastic - Cements, Mastic;
cements, mastic - Pulverised baked bricks, quicklime, and wood ashes, equal parts; mix thoroughly, and dilute with olive-oil; this mastic hardens almost immediately in the air, and never cracks beneath water.

Mastic for wood block floors

    This consists of 3 parts pitch and 1 part Stockholm tar heated together and used hot. The mixture is poured into a wooden tray and each floor block dipped to the depth of the key, then pressed down in position. In some cases the mixture is poured on floor and the blocks pressed on to it. This is more comfortable to the hands, but not so good in results unless the man is experienced in his work. About 6 quarts is allowed to a square.
  1. Coat the concrete or cement floor with Stockholm tar, then lay blocks with mastic composed of 100 parts asphalt to 1 part Stockholm tar, melted together and used hot.
  2. 2 parts Stockholm tar, 1 part pitch heated together and thickened a little with about 1/10-th quicklime.


Mastic for bedding wood sills on stone, etc

  1. 3 parts dry red lead, and 3 parts sharp clean sand, to which is added 2 parts ground lias lime. Mix dry, then make into a stiff paste with boiled linseed-oil.
  2. 1 part dry red lead, 8 parts dry brick dust, mixed to a paste with boiled linseed-oil. In applying see that surfaces are clean and dry, then coat with boiled oil and use the mastic as putty would be used.


Mastic for kitchen range and stove work

Fine sharp sand, 28 lb.; powdered litharge, 14 lb.; quicklime, 4 lb.; linseed-oil to make a mass like putty.

Mastic Cement for Covering the Fronts of Houses

50 parts, by measure, of clean dry sand, 50 of limestone (not burned) reduced to grains like sand, or marble dust, and 10 parts of red lead, mixed with as much boiled linseed-oil as will make it slightly moist. The bricks to receive it should be covered with 3 coats of boiled oil, laid on with a brush, and suffered to dry before the mastic is put on. It is laid on with a trowel like plaster, but it is not so moist. It becomes hard as stone in a few months. Care must be exercised not to use too much oil.

Serbat's Mastic

Finely pulverised sulphate of lead is pounded together with 1 part of old linseed-oil in a suitable apparatus. Repeat the operation twice, adding each time 1 part of finely pulverised pyrolusite. It is then preserved in a stone vessel closed with wet bladder. Another direction for preparing this mastic is as follows: Triturate 5 parts of zinc oxide and 5 of sulphate of lead with about 4 of linseed-oil, then add gradually 10 parts of finely ground pyrolusite and a like quantity of colcothar, and pound the whole in a cast-iron mortar with an iron pestle, adding gradually 100 parts more of pyrolusite and a like quantity of colcothar. The cement is good when sufficiently thick, and at the same time so flexible that it can be rolled out between the fingers without breaking. If the cement has become hard add some more oil and work it thoroughly with the iron pestle.

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