If you are willing to wholesale quality,Website: , advanced and durable calcined alumina for thermal conductivity from one of the famous China alpha alumina for abrasive, acg-2a manufacturers, CHALCO is always at your service. As thermal insulation filler polymer, it is widely used in thermal conductivity of plastics, rubber, adhesives and coatings. Al2O3 Na2O Fe2O3 SiO2 Specific surface area -325 mesh tap density LOI % m2/g 99.7 0.08-0.13 0.02-0.07 0.04-0.14 ≤0.5 ≥98.5 ≥2.0 ≤0.1 Particle size could be processed to order