粗大挺进朋友的未婚妻,娇妻在厨房被朋友玩得呻吟,人妻在卧室被老板疯狂进入

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      About Us
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      ROTA is one of the world's leading manufacturers of silicon carbide(SiC) and aluminium oxide(Al2O3) under the trade name DGJ, and ROTA is also an important manufacturer and expert of bonded abrasives, coated abrasives and specialty refractory products for the ceramics, metallurgy, foundry, chemical, petrochemical, power generation, waste processing and glass making industry.

       

      ROTA , estalished in 1996, has production and support facilities in Zibo, Shandong and Lianyungang, Jiangsu. The ROTA abrasives & Refractory plants have a long history of delivering high grade materials to a wide variaty of markets,and have offen been in the forefront of technological development of new products and applications.

       

      ROTA now has a total installed capacity exceeding 10,000 tons of silicon carbide , 12,000 tonts of aluminium oxide and over 10,000 tons of bonded and coated abrasives per year.

       

      We supply silicon carbide and aluminium oxide throughout the world, and we cover every application.

       

      ROTA mainly specializes in silicon carbide (SiC), black and green

       

      SiC chemical and physical properties 
      Silicon carbide is a synthetical material with outstanding hardness only superseded by diamond, CBN and B4C. the chemical inertness to most of the alkaline and acids in combination with its excellent heat and abrasion resistance make silicon carbide very suitable under extreme operation conditions. 
      Vickers Hardness      30 GPA  Thermal conductivity         41W/m 0K
      Thermal expansion     5×10-6 /0K Specific gravity                 3.21 g/ccm 

       

      We cover your every application 

       

      We supply you with abrasive grains, wiresawing grains, high performance powders, refractory, metallurgical grains, bonded abrasives, coated abrasives and superabrasives in forms of silicon carbide, aluminium oxide, diamond and cubic boron nitride.

       

           
                              


       

      粗大挺进朋友的未婚妻,娇妻在厨房被朋友玩得呻吟,人妻在卧室被老板疯狂进入