hardness

Mica sheet can be composed of muscovite or phlogopite type. These are two types of mica that can be used in the field of industry. Musco...

It`s kind of bitumen which is provided during the process of oxidation of vacuum bottom (the bitumen production feedstock that derives fr...

Class 8.8 bolts are one of the most common structure of hex bolts in the market. they provide acceptable rate of strength and hardness si...

concrete washing machine balancing wight with the best qualified material cement and iron ore and the most functional concrete additive...