i061 UUMI’USHIUND, EXAM] _ COAUNG GR PLASTIC 98 2,407,739 Patented Sept. 17, 1946 UNITED STATES PATENT. OFFICE 2,407,739 PLASTIC CEMENTITIOUS MATERIAL Gaspare Ferrante, Brooklyn, N. Y., assignor to Grasoph Building Corp., Brooklyn, N. Y., a cor-V poration of New York No Drawing. Application December 2, 1943, Serial No. 512,599 1 Claim. (Cl. 106-98) 1 2 This invention relates to new and useful im provements in a plastic cementitious material, and has more particular reference to so-called in terior wall plaster. Still further the invention proposes an im proved plaster and plaster board which may be manufactured and sold-at a reasonable cost/and which contains nothing of an injurious or dele _ It is an object of this invention to produce a terious nature. wall plaster (interior) which is far superior than present day similar plaster.~ ' For further comprehension of this invention, and of the objects and advantages thereof, ref erence will be had to the following description, The invention contemplates the use of brick dust incorporated within the plaster to obtain and to the appended claims in which the vari mu advantages. Bricks hay-beeen proven to 10 ous'novel features of the invention are more be an excellent material for outside walls. Brick particularly set forth. dust embodies many of the advantageous fea In order to enable others to better understand tures of brick material, yet, as far as I know. it this invention speci?c formulas will now be given has never been used for interior wall construc for a plaster and plaster board embodying the tions. 15 essential features thereof. To better understand the invention it must Example I be recognized that Portland cement,- and other Formula for an interior wall plans-tier. cementitious substances are no rac ical as bases for interior plaster because of their lack of plas c y, or sprea n qualities under the mechan ic’s tool, as well as the lack of adhesion. How. ever, such materials have been made adaptable, for these uses by the addition of 1 in '20 lime (hydrated lime) used in various proportions as e plaster ingredients are being mixed. It is general practice to use a plaster base mix ture with ?nishing lime, sand, and siniilar ma lbs-.. 100 (71%%) Finishing lime (hydrated lime) lbs__ 10 (OW/6%) Brick dust ________________ "lbs..- 20 (14%%) Sand and marble dust ______ _..lbs_.. 10 (07%.) Water __-_-., _____________ _..gals__ 10-15 The brick dust which I have used with good results was obtained from the nearby New Jersey terlals in th'é'c‘oiis'?’iictiodof’ interior wall plas-. . Cementnplaster base (interior) brick factories. This brick dust I call “Jerseyu brick dust." The ingredients are mixed to'g'éth‘ér e m1 way used for the making of plaster. ered that this plaster material may be used to It will be found that the plaster has good spread construct plaster board as well. The improved ing and adhesive qualities. interior plaster and plaster board have especially good ?reproof and waterproof qualities-they are Example II sturdy and strong; they have low heat conduc 35 The following formulae may be used for rock" tivity and act as good heat insulation material. The improved plaster and plaster board does not slitlllaltuni?temqar?st ' readily crack, crumble nor break under ordinary Finishing lime (hydrated lime) conditions of service. It is particularly well lbs..- 60 (30%) adapted to receive coats of paint and covering 40 Cement plaster base _______ “lbs-.. 100 (50 %) materials. Sawdust ________________ .._lbs__ 25 (12 1/¢ %) Thave discovered by using brick dust, a far superior plaster is obtained. . have scov I am aware of the fact that brick dust has been used in connection with concrete to construct ar ti?cial bricks. I am also aware that brick dust has been used as a coloring material for plastic materials from which various articles are molded. 30 Brick dust _______________ __lbs__ Water __________________ .. -gals__ 15 (7%%) 5-10 The plaster boards are made by mixing the materials and working them in the usual ways. However, the advantages gained by using brick While I have described the preferred embodi dust in an interior plaster or plaster board has ments' of my invention, it is to be understood that never been discovered before. I do not limit myself -to the precise formulas It is another object of this invention to use 50 herein disclosed, and the right is reserved to all the largest percentage possible of brick dust in a changes .and modi?cations coming within the scope of the invention as de?ned in the append plaster or plaster board, commensurate with the production of a good interior plaster and plaster ed claim. board. Having thus described my invention, what I I believe that an interior plaster is generally 55 claim as new and desire to secure by United States Letters Patent is: characterized by théYse‘TSI’LYiYdi‘aWt’edQIime, and the dominating feature of my invention is the An interior wall plaster, consisting of a mix use ofwbrick dust with such plaster. ture of a Portland cement base, 100 lbs.; hydrated The improved plaster, in accordance with this lime, 10 lbs.; brick dust, 20 lbs.; sand and marble invention, may be used for all purposes for which 60 dust, 10 lbs.; and water, 10 to 15 gals. interior plasters are now being used. GASPARE FERRANTE.