T harem@ orifice i . ,ammw.. llo thawing’. ¿application med May a?, i927", Serial No. 194,862, and in France J’une 26, 19%. The enamels in current use for the en to the composition in use, in all their natural amelling'o'ë metals by the known methods or artilicial compounds or derivatives; by the employed in this industry, i. e. by the appli use of barium or strontium lI am chielly en cation oit the enamel by sprinkling. rolling, abled to obtain fluxes of a stable character, @n dipping, or in liquid form are essentially i. e. such as will preserve a perfect transpar based upon lead compounds such as litharge, ency during the different furnace heating op minium, massicot, lead carbonate, or zinc erations required in the manufacture. compounds, such as have been employed for For the preparation of such enamels, either a long period in `French and foreign enamel transparentA or opaque, and o tionally col werl'ïs. oured, l may employ the following substances The present invention relates to opaque en which are in current use: els both White and coloured, and chiefly to Boric anhydride; which is furnished by nsparent enamels of all colours so»called berate of soda, optionally crystallized, or ceramic enamels upon cast and sheet iron and pandermite, borocalcite, borie acid or the like. like other metals and it possesses a great ad» Sodium or potassium; in the form of carbo “vantage 'from 'the Íactvthart eliminates the nate, nitrates or chlorides. pernicious el‘fects oit lea-d poisoning in the Calcium; in the form of sulphate, carbo namel Works, as Well as the dcritrilication nate, phosphate and the like, this constituent ` ' eels contai,ningn a is moreover not necessary. ,L ounds, this taking Silica; in the form of quartz, sands, silica of pebbles either natural or baked. ,or’ r itduring Vaismelling the use process of heat Fluorine; in its natural or artificial com es 'with such enamels. pounds. i ' amels :tree 'trom lead which are man Alumina; represented by natural minerals. accerding method herein Zinc; in the form of its usual compounds. aiter specified, are moet adyantageous’?rom »To such substances I usually add, accord that even after a long period they ing to-the invention, barium and eventually are not subject ‘to the changes inherent in the strontium in all their forms and natural or lnaorrn enamels under the action ot the atmos artificial derivatives such as carbonates, sul phere. ' A ' phates, chlorides, nitrates, phosphates, and 80 " rllhe different methodaoit enamelling are the like. In these various compositions, l too “well known to require anydetailed de-~ prefer to employ the silica in the form of scril¿ ien. ril‘he use or“ the enamels in accord­ feldspar and to ,directly add, as a surplus, ance with' the invention `will offer no changes alumina either hydrated or calcined. in such methods. 'lWith reference for esam All these substances, which are accurately 85 ple to cast iron according to the process in proportioned and are intimately mixed, are “which the enamel. is applied as powder, the then melted and cast in the dry or moist state, substance is directly sprinkled upon the ob» and are then ground up in the dry or moist ject which is suiiiciently clean and is heated state, according to the use Which is to be ‘the proper redness. ln the case of trans made of the enamel. 90 parent enamelling on what is termed the ce The composition of the mixtures may 0b ramic process, layer ol’ White enamel must viously vary according to a great number tir-st be put en in order "to form 'the back of formulae and Within very Wide limits, and ground, and this_is at once "followed by a sec l may mention the following: ond sprinkling' a' ,_ ransparent colored cn Per cent Boris anhydride ___________________________ __ 5 to 3() aniel with placinf» the ohject .ag .a in the Barium ____________________________ _- 5 to 75 Strontìum__ _ _ _ _ _ _ _ _ _ _ _ __ 5 to T5 Mlmlics__ ____ __ _ 5 to im felation essentially consist Silica" ____ __ 5 to 40 Zinc__ _ ___ ___-_ _ l) to ‘.20 ts such as barium and LimoY ___ _ _ _ _ _ _ _ _ _ _ _ _ _ _ „ _ „ . _ _ _. 1_ t0 50 Alumina___. __ _____________________ -_ 0,5 to 1G es which vary according Fluorine _______________________________ __ 0,5 to 14 1,833,087 The compositions are coloured before or A composition for enamelling metals by after they are melted, accordin to the nature sprinkling upon a first coating of opaque of the product to be obtained, y adding the white enamel, the use of a transparent or known colouring oxides such as the oxides translucent enamel free from lead, essentially of iron, manganese, copper, zinc, cadmium, consisting in a mixture of borax 21%, boric uranium or the like. acid 11.25%, baryta 25%, feldspar 8.75%, To obtain opaque enamels with these dif alkalies 11%, lime 11.5%, zinc 10%, alumina ferent composltions, it is necessary to em 1.5%. ­ ploy natural phosphate or sulphate of lime, In testimony whereof I have hereunto af 10 or calcined bone phosphate, Vienna lime, fixed my signature. phosphate of baryta, oxide of antimony of LOUIS ERNEST MIGEOT. .the maximum purity in order to avoid preju dicial salts, oxide of tin, fiuorspar, cryolite and other bodies. ' 15 The following is an example of a white opaque enamel which has a remarkable solid , ity and adhesion, which may be employed di rectly upon cast iron, sheet iron, copper or the like, either alone and in powdered form 20 for sanitary articles, Washstands, sinks, bathtubs and the like, or in liquid form, or as a first layer and a backing for a transparent coloured enamel: Per cent Borax _____________________________________ __ 9.30 25 Feldspar _____ 16190 Carbonate of lime ____________________________ _. 8,86 Baryta _ __--. 24.60 Bol-ic ncid__ ___ __ 5,65 Zinc ___ 3.65 Alkalies ____________________________________ _. 6,43 Antimony ________ __ 7,52 Fluorspar ________ __ ___ __________ __ 5,30 30 Phos hate of lime ___________________________ __ 9,53 Cryo ite_ ____ 1,13 Alumina ___________________________________ __ 1,13 100,00 This white opaque enamel may be used as 35 a base for all opaque coloured enamels by adding the known colouring oxides. lil@ The followinßr is a formula for a trans parent enamel o? the ceramic type: Per cent Iiornx _____________________________________ __ ‘ 1 40 Boi-ic acid _________________________________ __ 11,25 lâuryta ___________________________ __ __- 25 iiilai Feldspar _____________________ _'. ____________ _. 8,75 Alknlìes __________________________________ ___ 11 Lime _ __ «­­____ 11,5 Zinc _______________________________________ _. 10 Alumina ___________________________________ __ 1,5 100,00 ll@ This base and the bases of similar compo sition are coloured by adding suitable colour ing substances, either before or after they are melted. 50 When applied upon a first layer of opaque white, this enamel can be favourably com pared with the products in current use as con cerns solidity, adhesion, brilliancy and other qualities. It can especially be subjected to a second or third heating in the muilie Without any change in its nature. ~ lVhen the various enamels are to be ap plied upon sheet iron, I simply add to vthe enamels themselves the usual substances CO which will hold them in suspension in the liquid, such as pipe clay, kaolin, magnesia and the like. Having thus described my process, What I claim as new therein, and my own in 65 vention, is: .