scholarly journals Influence of Particle Size on Fluidity and Packing of Sodium Borate and Boric Acid Powders

1967 ◽  
Vol 16 (164) ◽  
pp. 314-318
Author(s):  
A. Ikekawa ◽  
N. Kaneniwa
Keyword(s):  
Particle Size ◽  
Boric Acid ◽  
Sodium Borate

6 Final Report on the Safety Assessment of Sodium Borate and Boric Acid

1983 ◽  
Vol 2 (7) ◽  
pp. 87-125 ◽  
Keyword(s):  
Boric Acid ◽  
Guinea Pigs ◽  
Water Solution ◽  
Testicular Atrophy ◽  
Male Rats ◽  
Sodium Borate ◽  
Final Report ◽  
Intact Skin ◽  
Cosmetic Ingredients ◽  
Cosmetic Formulations

Sodium Borate and Boric Acid are used in cosmetics as preservatives, antiseptics, water softeners, pH adjusters, emulsifiers, neutralizes, stabilizers, buffers, or viscosifiers. Investigators have reported that Sodium Borate and Boric Acid are poorly absorbed through intact skin; however, both compounds are absorbed through abraded, denuded, or burned skin. In a 90-day dermal toxicity study, Boric Acid (25-200 mg/kg/day) was nonirritating and nontoxic when applied to the intact skin of rabbits. Sodium Borate and Boric Acid were relatively nontoxic when tested orally in animals. A 5% Sodium Borate in water solution was mildly or moderately irritating to the skin of rabbits and guinea pigs, and practically nonirritating when instilled in rabbits' eyes. Acute studies indicated that, at 10% in water, Boric Acid was mildly or moderately irritating to the skin of rabbits and guinea pigs. Sodium Borate or Boric Acid in the diet of rabbits and rats caused growth retardation. Doses of up to 1.06 g/kg/day Sodium Borate in the diet of male rats exerted toxic effects on the gonads as well as infertility. Boric Acid was nonmutagenic in the Ames test. Boric Acid induced reduced eye phenocopies and lumpy chromosomal inclusions in Drosophila melano-gaster. Limited carcinogenic and teratogenic studies did not indicate a statistically significant effect. In clinical studies, cosmetic formulations containing up to 3.2% Sodium Borate were nonirritating to moderately irritating and nonsensitizing when applied to human skin. Formulations containing up to 2.4% Boric Acid were moderately irritating and practically nonirritating. Photopatch testing of formulations containing 1.1% or 1.7% Sodium Borate were negative. Based on the increased absorption of Boric Acid by damaged skin as compared to intact skin, as well as the testicular atrophy observed in experimental animals, the Panel concluded that Sodium Borate and Boric Acid, in concentrations ≤ 5%, are safe as cosmetic ingredients when used as currently recommended; however, cosmetic formulations containing free Sodium Borate or Boric Acid at this concentration should not be used on infant or injured skin.

REPORT OF SUBCOMMITTEE ON ACCIDENTAL POISONING

PEDIATRICS ◽  
1960 ◽  
Vol 26 (5) ◽  
pp. 884-884
Author(s):  
◽  
Edward Press ◽  
William C. Adams ◽  
R. F. Chittenden ◽  
Joseph R. Christian ◽  
...  
Keyword(s):  
Boric Acid ◽  
The United States ◽  
Sodium Borate ◽  
Accidental Poisoning ◽  
Talcum Powder ◽  
Suppressant Effect ◽  
United States Food ◽  
Background Material ◽  
States Food ◽  
Ophthalmic Solutions

BACKGROUND MATERIAL Boric acid (H3BO3, boracic acid, orthoboric acid) is a colorless and odorless compound occurring as crystals, granules or a white powder. It is usually prepared by action of sulfuric acid on borax (sodium borate). Boric acid is used medicinally in ophthalmic solutions, and the powder or solution as an acidifying agent in treating the irritation produced by ammonia from the urine in diapers of infants, and in dermatology in ointments either alone or in combination with other medicinal agents. It has also been employed in gargles, mouth washes and as a preservative. Commercial uses of boric acid are varied, but often include its use in the preparation of face or body powders in which it is added to tale. It is stated that boric acid has a suppressant effect on molds or mildews, or assists in enabling the powder mixtures to flow more freely from the containers. The usual ointment contains 10% boric acid; the standard medicinal solution contains not less than 4.25% boric acid. The United States Food and Drug Administration, on January 30, 1954, issued a statement to the effect that borated talcum powder containing 5% or less of boric acid is safe for use as a dusting powder on babies. The implication here is that powder using more than 5% boric acid would not be safe. Fatalities among adults from the ingestion of boric acid have been reported from as little as 1 teaspoonful of boric acid. Another report indicates that 2 ounces of a 5% solution of boric acid were fatal to an infant.

Study on the Synthetic Process of Calcium Borate

2007 ◽  
Vol 280-283 ◽  
pp. 605-608 ◽  
Author(s):  
C.E. Cao ◽  
Ying Jun Wang ◽  
N.Z. Zheng ◽  
C.H. Xiong ◽  
H.R. Shen
Keyword(s):  
Particle Size ◽  
Calcium Carbonate ◽  
Boric Acid ◽  
Ph Value ◽  
Raw Materials ◽  
Synthesis Temperature ◽  
Calcium Borate ◽  
Synthetic Process ◽  
Concentration Time ◽  
Ceramic Decoration

Calcium borate used for non-pollution flux of ceramic decoration materials is synthesized by using boric acid and calcium carbonate as raw materials. The effects of reaction temperature, concentration, time, pH value and additive agent on synthesis of calcium borate are studied. The synthesized products are characterized by using DTA, XRD, TEM and SEM. The results show that the better conditions are: synthesis temperature is 80-100°C, the proportion of boric acid and water is0.26 ~ 0.42 to 1(mol), the proportion of calcium carbonate and boric acid is 0.09-0.15 to 1(mol), the pH value is 5 ~ 7, reaction time is 3hs. The synthetic calcium borate is non-crystalline with particle size of 0.1 ~ 0.2 µm, when being calcinated at 300°C, the main crystal phase isCaO·3B2O3·4H2O.

A Combination of H3BO3 (nm) and TiO2 (μm) Nano/Microparticle as an Additive to the MQL Enhances the Performance of Cutting

2018 ◽  
Vol 1148 ◽  
pp. 88-95
Author(s):  
P. Shreenivasa Rao ◽  
P.V.J. Mohan Rao ◽  
Y. Srinivasa Rao
Keyword(s):  
Particle Size ◽  
Titanium Dioxide ◽  
Regression Analysis ◽  
Boric Acid ◽  
Ball Milling ◽  
Cutting Forces ◽  
Engineering Industry ◽  
Lubricating Oil ◽  
Minimum Quantity ◽  
Specific Study

Turning is a mostly used metal removal process in the engineering industry that involves generation of high temperature and cutting forces. Lubrication becomes critical to minimize the effects of this temperature and forces on cutting tool and workpiece. Development of lubricants that are environmental is acquiring importance. For this, a specific study on the application of Minimum Quantity Lubricants as lubricating oil in turning operation is working on. In the present work a specific study on the application of nanosolid boric acid with titanium dioxide (μm) suspended in lubricating oil in turning of EN24steel with carbide tool. SAE-40 is taken as base lubricants and boric acid solid lubricant of (50, 60 80, 538nm) particles size and titanium dioxide (100μm) with different weight percentages taken as suspensions. Variations in cutting forces, tool temperatures, and surface roughness are studied. For this Boric acid nanoparticle were prepared by using High Energy Ball Milling. Ball milling which was carried out for the total duration of 15 hours. The sample was taken out after every 5 hours of milling for characterizing. The nanostructured boric acid particle size measurement was done by X-Ray Diffractometer which was supported by the XRD Scherer’s formula. It was found that the particle size got reduced from 538nm to 63nm for the period of 15 hrs. In present work, the obtained results were predicted by using Regression analysis method for the prediction of output parameters of the lathe machining process is modelled using two input variable parameters such as particle size of boric acid (nm) and the weight percentage of titanium dioxide (μm). Then the model predictions are compared with a set of reliable experimental data available, and it is found So that proposed Regulation analysis gives the results which are well in agreement with experimental results. Keywords: Turn machining, SAE-40 oil, Boric acid, Titanium dioxide, Minimum Quantity Lubrication (MQL), Regression analysis

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