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Combining values from the two systems may result in nonconformance with the standard. 2. DEFINITION 2.1 Deleterious Materialâ clay lumps, shale, soft, friable, or laminated particles, vegetable matter, or other objectionable material.3. APPARATUS 3.1 Balance, Class G2 in accordance with Tex-901-K, minimum capacity of 4000 g. 3.2 Drying oven, maintained at 110 Â± 5Â°C (230 Â± 9Â°F).se each system of units separately. Combining values from the two systems may result in nonconformance with the standard. 2. DEFINITION 2.1 Deleterious Materialâ clay lumps, shale, soft, friable, or laminated particles, vegetable matter, or other objectionable material. 3.
They are hard because of strong electrostatic forces between atoms. They are brittle because of low mobility of defects called dislocations formed in ionic solids. We all know that metals are ductile and they deform plastically because of movement of dislocations on certain crystallographic planes. In contrast, ionic solids donât deform plastically because of low mobility of dislocations. The low mobility comes from the fact that it is difficult to break ionic bond for a dislocation to move.