The Translucent Ceramic Tube( Polycrystal)is our professional product,Its raw matierial and the finished products manufactured by ourselves,so we have the adwantage over our competitors with low market prices of our products.The same time ,we can give you quality and quantity guaranteed. Properties Unit Data Al2O3 Content % ≥99.95 Volume Density g/cm³ 3.96 Linear Exp. Coefficient ×10-6mm/°C 6.5-8 Dielectric Constant IMHz 10.3 Breakdown Strength KV/mm ≥64 Resistivity Ω·cm 4.5×1015 Fracture Strength MPa ≥350 Transmittivity % ≥96 Type Structure Inner diameter of tube(mm) Thickness of wall(mm) Inner diameter of cap (mm) Thickness of cap(mm) Length of tube(mm) 35W ZT 4.0 0.60 2.065 2.550W ZT 4.0 0.60 2.065 2.5 41 70w ZT 4.0 0.60 2.065 2.265 3.0 51;52;58.2 FT 4.0;5.0 0.5;0.744;55 100W ZT 4.0 0.60 2.065 2.265 3.0 57;62.5;64.8 FT 5.0 0.7060 150W ZT 5.0;5.3 0.60 2.065 2.265 3.0 65;71.2 FT 5.0 0.7070 250W ZT 6.4 0.70 3.10;3.27 4.5 92±2.0 FT 6.8;7.0;7.2 0.7090 400W ZT 7.1;7.3 0.70 3.27;4.10 4.5 117.2±2.0 FT 7.2;7.4 0.70115 1000W ZT 10.8 0.85 4.10 4.5 189±2.0