Synonym: callosity, callousness, harshness, inclemency, insensibility, rigor, rigorousness, rigour, rigourousness, ruggedness, severeness, severity, stiffness, unfeelingness. Similar words: awkwardness, madness, sadness, kindness, wretchedness, harness, hard-pressed, wednesday. Meaning: ['hɑrdnɪs /'hɑː-] 
n. 1. the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale 2. devoid of passion or feeling; hardheartedness 3. the quality of being difficult to do 4. excessive sternness.
n. 1. the property of being rigid and resistant to pressure; not easily scratched; measured on Mohs scale 2. devoid of passion or feeling; hardheartedness 3. the quality of being difficult to do 4. excessive sternness. 
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151. The surface hardness medium manganese austenite steel's is increased remarkably by using the casting surface alloy.
152. The aging process of mullite short fibre reinforced ZL 109 composites was studied via hardness test.
153. Considering its colourable and castable nature, its extended hardness range, low wear and superior load bearing capacity, polyurethane is a smart substitute for rubber.
154. Bend test, heat immersion test, artificial sweat test,[www.Sentencedict.com] measurement of hardness and porosity were done for sample.
155. Customers to purchase standard hardness block within three months after the problem if the quality of shifting, Guaranteed return of goods if unsatisfied.
156. Tempered martensite was gradually generated as the cutting temperature increased, which is the main cause of the decrease in the hardness.
157. Mirror - DLC, TIN coating, its hardness, finish fastness and resistance has reached international standards.
158. The coatings prepared with this curing agent will be of good erosion resistance, hardness and glossiness.
159. The rubber wood in Hainan is characteristic of yellowy color, moderate hardness and easy processing.
160. Deposit's wearing resistance was evaluated by weighted sum of its hardness and porosity.
161. The hardness of this approach depends mostly on the CPU interrupt structure and context-switch hardware support.
162. SONOS flash memory has numerous advantages, such as excellent salability, high endurance, low power, radiation hardness, and is highly compatible with standard CMOS technologies.
163. Model HR-150AL is a high distance Rockwell Hardness Tester. It's fit for testing rockwell hardness of metal material.
164. And nepheline can improve the physical properties of PVC, such as impact toughness, surface hardness, etc. , meantime it can also improve the engineering properties of PVC.
165. Hardness profiles of boronizing layer with RE and without RE addition were measured by using micro-hardness tester from surface to core.
166. The structure of stemming is plate, densify , high hardness, and the stemming is disorder aggregate.
167. Shore's new S1 Portable Digital Durometer revolutionizes durometer hardness testing by utilizing state-of-the-art technology.
168. Performance: hardness uniform, not broken, ground resistance, the impact of high value, high efficiency integrated mill.
169. The main characteristics of abrasive wheels include five factors, namely abrasive material, grain size, hardness, structure and bond type.
170. The surface microstructure is fine cryptocrystalline martensite and alloy carbide which results in high hardness.
171. Compounding with the PUD , many improved properties can be contributed to the paint film, such as high hardness, gloss, buildiness, adhesion and resistant to water, chemicals and abrasion etc.
172. Influence of the initial temperature fields and mold hardness on the shrinkage defect of ductile iron casting by EPC process was mainly investigated in this paper.
173. By examinations of metallograph, microhardness, X-ray diffraction, the author determines the boriding layer's microstructure and hardness curve.
174. The homemade wear - resistant cast steel has high hardness and high tendency of hardenability after welding.
175. The public desires water which is low in hardness and total solids, noncorrosive, and non - scale - forming.
176. The structure of transverse ruptured 72A hard steel wire has been observed by microscope and its hardness has been measured.
177. If using direct fire heating, care should be taken to prevent the burning of oil, the bearings should be hung in the pan, the bottom will cause overheating and reduce the hardness.
178. For the lower hardness of the surface, use slurry abrasive with wax-coated particles can reduce the polishing time and improve the accuracy of the surface polishing.
179. Hard Spot. An area in the pipe with a hardness level considerably higher than that of the surrounding metal, usually due to localized quenching.
180. It can crush materials with middle and high hardness such as, ironstone, copper ore, granite, basalt, cobblestone, marble, limestone and so on.
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