scholarly journals Coated limestone as a filler for the production of PVC-products

2005 ◽  
Vol 59 (1-2) ◽  
pp. 32-35
Author(s):  
Slavica Mihajlovic ◽  
Zivko Sekulic ◽  
Milan Petrov
Keyword(s):  
Water Immersion ◽  
Transmitted Light ◽  
Raw Material ◽  
Immersion Method ◽  
Serbia And Montenegro ◽  
Laboratory Investigations ◽  
Two Phases

The results of laboratory investigations of the possibility to obtain coated limestone for the production of PVC-products are presented in this paper. Limestone from the "Vencac" deposit (Arandjelovac, Serbia and Montenegro) was used as the raw material. The investigations were carried out in two phases: obtaining the coated limestone and determination of the degree of coating. The results of the investigations showed that successful coating of the surface of the limestone particles with Ca-stearate (Ca-stearate content 3%) was achieved in a vibro mill with rings and the obtained degree of coating was higher than 95%. The coating degree was determined in transmitted light by a polarization microscope applying the immersion method (water immersion).

scholarly journals Preparation and properties of low cement castable sintered at different temperatures

2009 ◽  
Vol 3 (4) ◽  
pp. 191-196 ◽  
Author(s):  
Sanja Martinovic ◽  
Jelena Majstrovic ◽  
Velislav Vidojkovic ◽  
Tatjana Volkov-Husovic
Keyword(s):  
Water Immersion ◽  
High Alumina ◽  
Destructive Testing ◽  
Immersion Method ◽  
Different Temperatures ◽  
Compressive And Flexural Strengths ◽  
Lower Temperature ◽  
Application Requirements ◽  
Non Destructive

The low cement high alumina castable (LCC) studied in this paper was synthesised, cured and then treated at different sintering temperatures. Since any inhomogeneity introduced during the castable preparation can remain inside the material degrading its properties and therefore the quality during service life, particular attention was given to the processing procedure in order to produce the material with the optimum characteristics. Composition of the castable regarding particle size distribution was adjusted according to the Andreassen's packing model. The samples were sintered at 1100, 1300 and 1600?C for three hours. Influence of the different sintering temperatures on the castable properties is discussed. Compressive and flexural strengths were determined by destructive testing method, while the water immersion method was used for determination of the bulk density and the water absorption. Changes of elastic properties and microstructure (porosity) were observed by the non-destructive testing methods, ultrasonic measurements and image analysis. Based on the results, it can be concluded that sintering temperature has strong influence on the properties of the LCC. Exceptionally good properties were obtained for the sample sintered at 1600?C, but it should be highlighted that the samples treated at 1100 and 1300?C were provided with good properties, too. This should not be neglected because of the energy saving importance, in cases where the material sintered at lower temperature satisfies the application requirements. .

An improved technique for the determination of rock porosity

1986 ◽  
Vol 23 (8) ◽  
pp. 1068-1074 ◽  
Author(s):  
T. W. Melnyk ◽  
A. M. M. Skeet
Keyword(s):  
Spatial Variation ◽  
Water Immersion ◽  
Dry Weight ◽  
Mean Value ◽  
Modified Technique ◽  
Immersion Method ◽  
The Mean ◽  
Water Saturated ◽  
Improved Technique

A modified technique for the determination of the connected porosity of rocks by the water immersion method has been developed and tested. The technique is recommended for rocks with porosity less than 0.05. The major modifications to the technique include saturation of the sample under vacuum conditions and determination of the water-saturated but surface-dry weight from a drying curve.Porosity measurements on 48 granitic samples showed that the technique is reproducible within a 95% confidence range of ±4% of the mean value. However, the possibility of spatial variation of porosity must be taken into account in assigning uncertainties to the measured values.

DETERMINATION OF FATTY ACIDS COMPONENTS COMPOSITION IN THYMUS X CIRIODORUS VAR. «SILVER QUEEN» HERBAL RAW MATERIAL

Fitoterapia ◽  
2019 ◽  
Vol 4 (4) ◽  
pp. 55-58
Author(s):  
J. M. Steshenko ◽  
◽  
O. V. Мazulin ◽  
G. P. Smoylovska ◽  
G. V. Mazulin ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Raw Material

Liquid Chromatographic Determination of Amiodarone Hydrochloride and Related Compounds in Raw Materials and Tablets

1994 ◽  
Vol 77 (6) ◽  
pp. 1447-1453 ◽  
Author(s):  
Pauline M Lacrok ◽  
Norman M Curran ◽  
Wing-Wah Sy ◽  
Dennis K J Goreck ◽  
Pierre Thibault ◽  
...  
Keyword(s):  
Raw Materials ◽  
Chromatographic Determination ◽  
Raw Material ◽  
Liquid Chromatographic Method ◽  
Limit Of Quantitation ◽  
Liquid Chromatographic Determination ◽  
Liquid Chromatographic ◽  
Amiodarone Hydrochloride ◽  
Related Compounds

Abstract A liquid chromatographic method for the determination of amiodarone hydrochloride and 10 related compounds in drug raw material and for assay of drug in tablets was developed. The method specifies a 3 jxm Hypersil nitrile column (150 × 4.6 mm), a mobile phase of 1 + 1 acetonitrile–ammonium acetate buffer (0.1 M adjusted to pH 6.0 with 0.1 M acetic acid), a flow rate of 1 mL/min, and detection at 240 nm. The lower limit of quantitation of the related compounds is 0.02% or less. Drug contents in 2 raw material samples were 100.1 and 99.9% and ranged from 98.2 to 99.4% in 3 tablet formulations. Impurity levels in 2 samples of raw material from different manufacturers were ca 0.4%. The presence of 3 of the known related compounds in these samples was confirmed by liquid chromatographymass spectrometry. The method applied to raw materials was evaluated by a second laboratory and found to be satisfactory.

Determination of main raw material source in bar soaps using mid-infrared spectroscopy combined with classification tools

2021 ◽  
Vol 164 ◽  
pp. 106029
Author(s):  
Diego Maciel Gerônimo ◽  
Sheila Catarina de Oliveira ◽  
Frederico Luis Felipe Soares ◽  
Patricio Peralta-Zamora ◽  
Noemi Nagata
Keyword(s):  
Infrared Spectroscopy ◽  
Raw Material ◽  
Material Source ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy
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