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In this method, 0.1 g of SAP material is placed into a permeable bag, which is suspended over excess water in a beaker. Wait 20 min. and weigh the bag and then calculate the percentage of swelling through the following formula: (w2-w1)/(w1) % w1= weight of the polymer (Before swelling) w2= weight of the polymer (After swelling)
Evaluation of Water Quality Using Biotic Index Values [3] Biotic Index Water Quality Degree of Organic Pollution 0.00 - 3.50 Excellent No apparent organic pollution 3.51 - 4.50 Very Good Possible slight organic pollution 4.51 - 5.50 Good Some organic pollution 5.51 - 6.50 Fair Fairly significant organic pollution 6.51 - 7.50 Fairly Poor
Material selection is often benefited by the use of material index or performance index relevant to the desired material properties. [2] For example, a thermal blanket must have poor thermal conductivity in order to minimize heat transfer for a given temperature difference. It is essential that a designer should have a thorough knowledge of the ...
Traditionally, the wear of materials has been characterized by weight loss and wear rate. However, studies have found that wear coefficient is more suitable. The reason being that it takes the wear rate, the applied load, and the hardness of the wear pin into account. Although, measurement variations by an order of 10-1 have been observed, the ...
MFI Measuring device. The Melt Flow Index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer.It is defined as the mass of polymer, in grams, flowing in ten minutes through a capillary of a specific diameter and length by a pressure applied via prescribed alternative gravimetric weights for alternative prescribed temperatures.
Specific modulus is a materials property consisting of the elastic modulus per mass density of a material. It is also known as the stiffness to weight ratio or specific stiffness. High specific modulus materials find wide application in aerospace applications where minimum structural weight is required.
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k is the resistance of the material to initial penetration [3] n is Meyer's index, a measure of the effect of the deformation on the hardness of the material [3] d is the chordal diameter (diameter of the indentation) The index n usually lies between the values of 2, for fully strain hardened materials, and 2.5, for fully annealed materials.