High purity silica bricks have stable physical properties,except for the RUL( 0. 2 MPa) exhibiting extreme two different levels of high-level RUL T0. 6of 1 683-1 686 ℃ and low-level RUL T0. 6of 1 174- 1 184 ℃.The low RUL phenomenon was researched,the formation reasons and solutions were analyzed in this paper. The low-level RUL T0. 6of 1 174- 1 184 ℃ of the un-burnt high purity silica bricks is a pseudo RUL T0. 6phenomenon for the transformation of crystalline morphology. The real RUL T0. 6of the specimen hot treated at 1 093 ℃ is> 1 680 ℃. Therefore,the un-burnt high purity silica bricks shall be hot treated at about 1 100 ℃ firstly before testing RUL. For the heating up of the lining of glass tank arch, baking curves with long holding time at1 100 ℃ shall be strictly obeyed to avoid the obvious shrinkage negatively influencing the lining stability.
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